commit f0931316ea2ce968b7c4117da6782bd3c2b13b18
Author: d_m <d_m@plastic-idolatry.com>
Date:   Fri Nov 10 11:44:37 2023 -0500

    Initial import

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d446045
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+# use glob syntax.
+syntax: glob
+*.pyc
+*.pyo
+*~
+TAGS
+*.rom
+.theme
+.snarf
+*.sym
+*.log
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0d9b9d9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+# determ
+
+terminal emulator for the uxn system.
+
+(TODO: improve this readme)
+
+## quick start
+
+```
+uxnasm term.tal term.rom
+python.py term.py term.rom
+```
+
+or alternately:
+
+```
+gcc term.c -c term
+./term term.rom
+```
diff --git a/cp437.tal b/cp437.tal
new file mode 100644
index 0000000..0d4998d
--- /dev/null
+++ b/cp437.tal
@@ -0,0 +1,259 @@
+&nul ( null )
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+&rs ( record separator )
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+&space ( space )
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diff --git a/determ.terminfo b/determ.terminfo
new file mode 100644
index 0000000..58fbad2
--- /dev/null
+++ b/determ.terminfo
@@ -0,0 +1,23 @@
+#	based on ansi
+determ|quasi-ansi terminal without color,
+	am, mc5i, mir, msgr, xenl,
+	cols#80, it#8, lines#24,
+	acsc=+\020\,\021-\030.^Y0\333`\004a\261f\370g\361h\260j\331k\277l\332m\300n\305o~p\304q\304r\304s_t\303u\264v\301w\302x\263y\363z\362{\343|\330}\234~\376,
+	bel=^G, blink=\E[5m, bold=\E[1m, cbt=\E[Z, clear=\E[H\E[J,
+	cr=\r, cub=\E[%p1%dD, cub1=\E[D, cud=\E[%p1%dB, cud1=\E[B,
+	cuf=\E[%p1%dC, cuf1=\E[C, cup=\E[%i%p1%d;%p2%dH,
+	cuu=\E[%p1%dA, cuu1=\E[A, dch=\E[%p1%dP, dch1=\E[P,
+	dl=\E[%p1%dM, dl1=\E[M, ech=\E[%p1%dX, ed=\E[J, el=\E[K,
+	el1=\E[1K, home=\E[H, hpa=\E[%i%p1%dG, ht=\E[I, hts=\EH,
+	ich=\E[%p1%d@, il=\E[%p1%dL, il1=\E[L, ind=\n,
+	indn=\E[%p1%dS, invis=\E[8m, kbs=^H, kcbt=\E[Z, kcub1=\E[D,
+	kcud1=\E[B, kcuf1=\E[C, kcuu1=\E[A, khome=\E[H, kich1=\E[L,
+	mc4=\E[4i, mc5=\E[5i, nel=\r\E[S, op=\E[39;49m,
+	rep=%p1%c\E[%p2%{1}%-%db, rev=\E[7m, rin=\E[%p1%dT,
+	rmacs=\E[10m, rmpch=\E[10m, rmso=\E[m, rmul=\E[m,
+	s0ds=\E(B, s1ds=\E)B, s2ds=\E*B, s3ds=\E+B,
+	setab=\E[4%p1%dm, setaf=\E[3%p1%dm,
+	sgr=\E[0;10%?%p1%t;7%;%?%p2%t;4%;%?%p3%t;7%;%?%p4%t;5%;%?%p6%t;1%;%?%p7%t;8%;%?%p9%t;11%;m,
+	sgr0=\E[0;10m, smacs=\E[11m, smpch=\E[11m, smso=\E[7m,
+	smul=\E[4m, tbc=\E[3g, u6=\E[%i%d;%dR, u7=\E[6n,
+	u8=\E[?%[;0123456789]c, u9=\E[c, vpa=\E[%i%p1%dd,
diff --git a/term.c b/term.c
new file mode 100644
index 0000000..2c7c06e
--- /dev/null
+++ b/term.c
@@ -0,0 +1,57 @@
+#include <pwd.h>
+#ifdef __APPLE__
+#include <util.h>
+#include <sys/ioctl.h>
+#else
+#include <pty.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+// compile with gcc term.c -lutil
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        printf("usage: %s ROM [LOGIN]\n", argv[0]);
+        return 1;
+    }
+    char *rom = argv[1]; // find term.rom
+    int login = argc > 2; // any extra arg signals login shell
+
+    // detect the user's shell
+    char *shell = getenv("SHELL");
+    if (shell == NULL) {
+        struct passwd *passwd = getpwuid(getuid());
+        if (passwd != NULL) {
+            shell = passwd->pw_shell;
+        }
+    }
+    if (shell == NULL) {
+        shell = "/bin/sh";
+    }
+
+    // allocate a pty, fork, inititialize file descriptor
+    int fdm = -1; // allocate file descriptor
+    pid_t pid = forkpty(&fdm, NULL, NULL, NULL);
+
+    if (pid < 0) { // failure
+        perror("fork failed");
+        return 1;
+    } else if (pid == 0) { // child
+        setenv("TERM", "ansi", 1);
+        // execute shell
+        if (login) {
+            execlp(shell, shell, "-l", "-i", NULL);
+        } else {
+            execlp(shell, shell, NULL);
+        }
+        perror("exec bash failed");
+    } else { // parent
+        struct winsize ws = {23, 80, 8, 12}; // rows, cols, xps, ypx
+        ioctl(fdm, TIOCSWINSZ, &ws); // set term window size
+        dup2(fdm, 0); // use fdm for stdin
+        dup2(fdm, 1); // use fdm for stdout
+        execlp("uxnemu", "uxnemu", rom, NULL); // exec uxnemu
+        perror("exec uxnemu failed");
+    }
+}
diff --git a/term.py b/term.py
new file mode 100755
index 0000000..0eea4b0
--- /dev/null
+++ b/term.py
@@ -0,0 +1,69 @@
+#/usr/bin/env python
+
+import fcntl
+import os
+import pty
+import sys
+import struct
+import termios
+
+# return dimensions (cols x rows)
+def load_dimensions():
+    # default to 80x24
+    dims = 80, 24
+
+    if not os.path.exists('.theme'):
+        return dims
+
+    try:
+        with open('.theme', 'rb') as f:
+            data = f.read(8)
+            if len(data) < 8:
+                return dims
+            vals = struct.unpack('HHHBB', data)
+            x, y = int(vals[3]), int(vals[4])
+            if x < 80 or y < 24 or x > 200 or y > 100:
+                print('invalid width/height: %d/%d' % (x, y))
+                sys.exit(1)
+            dims = x, y
+    except Exception(e):
+        print('error in .theme file: %s' % e)
+        sys.exit(1)
+    return dims
+
+def main():
+
+    # check usage
+    args = sys.argv[1:]
+    if len(args) < 1:
+        print('usage: %s ROM')
+        print('')
+        print('  ROM: the rom file to launch')
+        sys.exit(1)
+
+    # either detect dimensions from theme or use 80x24
+    cols, rows = load_dimensions()
+
+    # path to rom to run
+    rom = args[0]
+
+    # fork with a new pty
+    pid, fd = pty.fork()
+
+    if pid == 0:
+        # set TERM to something we can (mostly) handle
+        env = dict(os.environ)
+        env['TERM'] = 'ansi'
+        os.execvpe('bash', ['bash'], env)
+    else:
+        # set the terminal size
+        size = struct.pack("HHHH", rows, cols, 8, 12)
+        fcntl.ioctl(fd, termios.TIOCSWINSZ, size)
+
+        # use fd for the terminals stdin/stdout
+        os.dup2(fd, sys.stdin.fileno())
+        os.dup2(os.dup(fd), sys.stdout.fileno())
+        os.execvp('uxnemu', ['uxnemu', rom] + args[1:])
+
+if __name__ == "__main__":
+    main()
diff --git a/term.tal b/term.tal
new file mode 100644
index 0000000..d0289cf
--- /dev/null
+++ b/term.tal
@@ -0,0 +1,1328 @@
+( term.tal )
+
+( TODO: )
+( 3. need to implement scrolling regions )
+( 5. need draw-line word, and need to use it more )
+(   a. on delete, CSI-P )
+(   b. on insert )
+(   c. etc. )
+( 6. add more ansi control seqs )
+( 9. support shift+arrow and alt+arrow )
+( 10. crawl has screen-clearing issues )
+( 11. cursor hiding for cmatrix )
+( 12. clean up super ugly selection code )
+( 15. blinking text? )
+( 16. status line in femto, etc. is weird *** major bug )
+( 17. determ.terminfo )
+
+( ANSI sequences )
+( )
+( set attributes:       ESC [ x ; ... m  ->  0:reset 1:bright 2:dim 7:reverse )
+( get cursor position:  ESC [ 6 n        ->  ESC [ $row ; $col R )
+( set insert:           ESC [ 4 h )
+( set replace (def):    ESC [ 4 l )
+( enable line wrap:     ESC [ 7 h )
+( disable line wrap:    ESC [ 7 l )
+( )
+( move cursor home:     ESC [ H )
+( move cursor:          ESC [ $row ; $col H )
+( move to column:       ESC [ $n G )
+( move to row:          ESC [ $n d )
+( move up:              ESC [ $n A )
+( move down:            ESC [ $n B )
+( move forward:         ESC [ $n C )
+( move back:            ESC [ $n D )
+( move forward n tabs   ESC [ $n I )
+( )
+( erase from cursor to end of line:   ESC [ K )
+( erase from start of line to cursor: ESC [ 1 K )
+( erase line:                         ESC [ 2 K )
+( erase from current line to bottom:  ESC [ J )
+( erase from current line to top:     ESC [ 1 J )
+( erase screen:                       ESC [ 2 J )
+( )
+( insert lines:              ESC [ $n L )
+( delete n characters:       ESC [ $n P )
+( insert n blank characters: ESC [ $n @ )
+( )
+( show cursor:                        ESC [ ? 25 h )
+( hide cursor:                        ESC [ ? 25 l )
+( set bracketed paste mode:           ESC [ ? 2004 h )
+( unset bracketed paste mode:         ESC [ ? 2004 l )
+( )
+( SEMI-SUPPORTED )
+( select G0 charset ($c)              ESC lpar $c )
+( save cursor                         ESC 7 )
+( restore cursor                      ESC 8 )
+( )
+( NOT SUPPORTED YET: )
+( end alt charset                     ESC [ 10 m )
+( end alt charset                     ESC [ 11 m )
+
+( ESC [ $top $bot r -> set scrolling region [$top;$bot] )
+( ESC [ 7 h/l       -> set/unset auto-wrap mode )
+( ESC [ 1 h/l       -> set/unset application cursor keys [up: CSI A vs SS3 A] )
+( ESC =             -> application keypad [use SS3 sequences] )
+( ESC M             -> set ANSI conformance level 2 )
+( ESC >             -> normal keypad [normal sequences] )
+
+( ESC [ ? 1000 h/l -> send mouse X & Y on button press and release (X11 xterm mouse protocol) )
+( ESC [ ? 1002 h/l -> use cell motion mouse tracking, xterm )
+( ESC [ ? 1006 h/l -> SGR mouse mode, xterm )
+( ESC [ ? 1005 h/l -> UTF-8 mouse mode, xterm )
+( ESC [ ? 1015 h/l -> urxvt Mouse mode )
+( ESC [ ? 1051 l   -> unset sun function key mode )
+( ESC [ ? 1052 l   -> unset hp function key mode )
+( ESC [ ? 1060 l   -> unset legacy keyboard emulation )
+( ESC [ ? 1061 h   -> set VT220 keyboard emulation )
+
+|00 @System     [ &vect $2 &expansion $2 &title $2 &metadata $2 &r $2 &g $2 &b $2 ]
+|10 @Console    [ &vect $2 &r $1 &exec $2 &mode $1 &dead $1 &exit $1 &w $1 ]
+|20 @Screen     [ &vect $2 &w $2 &h $2 &auto  $1 &pad $1 &x $2 &y $2 &addr $2 &px $1 &sprite $1 ]
+|80 @Controller [ &vect $2 &button $1 &key $1 &fn $1 ]
+|90 @Mouse      [ &vect $2 &x $2 &y $2 &state $1 &pad $3 &scrollx $2 &scrolly $2 ]
+|a0 @File1      [ &vect $2 &ok $2 &stat $2 &del $1 &append $1 &name $2 &len $2 &r $2 &w $2 ]
+|b0 @File2      [ &vect $2 &ok $2 &stat $2 &del $1 &append $1 &name $2 &len $2 &r $2 &w $2 ]
+
+|0000
+    @tint         $1 ( draw mode. 01=regular, 04=inverted )
+    @attr         $1 ( 5 bits: RxxxBBFF )
+    @dirty        $1 ( screen needs redraw? )
+    @lastkey      $1 ( last button press )
+    @rows         $2 ( height in characters )
+    @cols         $2 ( width in characters )
+    @cur-x        $2 ( cursor x: 0 <= cur-x < cols )
+    @cur-y        $2 ( cursor y: 0 <= cur-y < rows )
+    @cur-wrap     $1 ( did cursor just wrap? )
+    @max-x        $2 ( cols-1 )
+    @max-y        $2 ( rows-1 )
+    @saved-x      $2 ( saved x coordinate )
+    @saved-y      $2 ( saved y coordinate )
+    @col-bytes    $2 ( 2*cols )
+    @lastmouse-x  $2 ( last mouse x )
+    @lastmouse-y  $2 ( last mouse y )
+    @lastmouse-st $1 ( last mouse press )
+    @is-lit       $1 ( are we selecting an area? )
+    @is-lit-flip  $1 ( is the selection flipped? i.e. drawing left/up )
+    @lit-click-x  $2 ( x coord of starting selection click )
+    @lit-click-y  $2 ( y coord of starting selection click )
+    @lit-drag-x   $2 ( x coord of selection drag )
+    @lit-drag-y   $2 ( y coord of selection drag )
+    @flash        $1 ( visual bell flash timer )
+    @pointer-ttl  $1 ( visible cursor timer )
+
+    ( terminal settings )
+    @ignored      $1 ( ignored )
+    @irm          $1 ( 01: insert and move right, 00: replace and overwrite )
+    @awm          $1 ( 01: wrap chars at margin, 00: overwrite at margin )
+    @tcem         $1 ( 01: cursor is visible, 00: cursor is invisible )
+    @paste        $1 ( 01: bracketed paste is on, 00: is off )
+
+    ( user configuration )
+    @debug       $1 ( use debug log? )
+    @show-banner $1 ( show banner on startup? )
+    @visual-bell $1 ( flash visual bell? otherwise do nothing )
+    @border-pad  $2 ( use border? should be 0000 or 0010 )
+
+|0100
+    ( metadata )
+    ;meta .System/metadata DEO2
+    ;meta/name .System/title DEO2
+
+    ( user configuration defaults )
+    #01   .debug STZ
+    #01   .show-banner STZ
+(    #0010 .border-pad STZ2 )
+    #0000 .border-pad STZ2
+    #01   .visual-bell STZ
+
+    ( 80 cols x 24 rows by default )
+    #0018 .rows STZ2
+    #0050 .cols STZ2
+
+    ( start cursor at origin - including border )
+    .border-pad LDZ2 .Screen/x DEO2
+    .border-pad LDZ2 .Screen/y DEO2
+
+    ( set colors )
+    #07bf .System/r DEO2
+    #07bf .System/g DEO2
+    #07bf .System/b DEO2
+
+    load-theme ( optional theme sets colors/dimensions )
+
+    ;on-redraw .Screen/vect DEO2  ( set up screen callback )
+    ;on-key .Controller/vect DEO2 ( set up keyboard callback )
+    ;on-mouse .Mouse/vect DEO2    ( set up mouse callback )
+    ;on-read .Console/vect DEO2   ( set up stdin callback )
+
+    setup-subprocess        ( set up experimental subprocess support )
+    reset-terminal          ( initialize terminal state and settings )
+    setup-debugging         ( set up debugging if requested )
+    draw-banner             ( draw banner if requested )
+
+    BRK
+
+( these only work with a patched uxnemu )
+( on other emulators they should be no-ops )
+@setup-subprocess ( -> )
+    ;shell .Console/exec DEO2 ( set up bash subprocess )
+    #80 .Console/mode DEO     ( start bash subprocess )
+    JMP2r
+
+@setup-debugging ( -> )
+    .debug LDZ ?&continue JMP2r &continue
+(    #99 #010e DEO ) ( put 99 in wst so #010e DEO reliably logs )
+    ;debug-log .File1/name DEO2
+    #01 .File1/append DEO
+    JMP2r
+
+@draw-banner ( -> )
+    redraw ;banner-ascii
+    &loop LDAk DUP ?&ok POP POP2 JMP2r
+    &ok read INC2 !&loop
+
+@reset-terminal ( -> )
+    ( set initial cursor )
+    #0000 .cur-x STZ2
+    #0000 .cur-y STZ2
+
+    ( confirm no buttons pressed yet )
+    #00 .lastkey STZ
+
+    ( calculate derived dimensions from cols/rows )
+    update-dimensions
+
+    ( set starting tint: reverse=0, bg=0, fg=2 )
+    #02 .attr STZ
+    update-tint
+
+    ( set initial modes )
+    #00 .irm STZ      ( insert and move right )
+    #01 .awm STZ      ( wrap at margin )
+    #01 .tcem STZ     ( show cursor )
+    #00 .paste STZ    ( bracketed paste is off )
+
+    ( prepare for initial draw )
+    init-screen
+
+    ( draw border )
+    .border-pad LDZ2 ORA ?draw-border
+    JMP2r
+
+@update-dimensions ( -> )
+    ( set col-bytes, frequently needed )
+    .cols LDZ2 DUP2 ADD2 .col-bytes STZ2
+
+    ( set max row/col )
+    .rows LDZ2 #0001 SUB2 .max-y STZ2
+    .cols LDZ2 #0001 SUB2 .max-x STZ2
+
+    ( set screen height/width based on rows/cols + border padding )
+    .border-pad LDZ2 DUP2 ADD2 DUP2
+    .cols LDZ2 #30 SFT2   ADD2 .Screen/w DEO2
+    .rows LDZ2 #000c MUL2 ADD2 .Screen/h DEO2
+    JMP2r
+
+@shell "bash 00 "-i 00 00
+
+@load-theme ( -> )
+    ;&path .File1/name DEO2
+    #0006 .File1/len DEO2
+    ;&r .File1/r DEO2
+    .File1/ok DEI2 ORA #01 [ JCN JMP2r ]
+    ,&r LDR2 .System/r DEO2
+    ,&g LDR2 .System/g DEO2
+    ,&b LDR2 .System/b DEO2
+    #0002 .File1/len DEO2
+    ;&x .File1/r DEO2
+    .File1/ok DEI2 ORA #01 [ JCN JMP2r ]
+    #00 ,&x LDR .cols STZ2
+    #00 ,&y LDR .rows STZ2
+    JMP2r [ &path ".theme $1 &r $2 &g $2 &b $2 &x $1 &y $1 ]
+
+@first-addr ( -> )
+    ;cells JMP2r
+
+@bol-addr ( -> addr* )
+    .col-bytes LDZ2 .cur-y LDZ2 MUL2 ;cells ADD2 JMP2r
+
+@cur-addr ( -> addr* )
+    .col-bytes LDZ2 .cur-y LDZ2 MUL2 .cur-x LDZ2 DUP2 ADD2 ADD2 ;cells ADD2 JMP2r
+
+@eol-addr ( -> addr* )
+    .col-bytes LDZ2 .cur-y LDZ2 INC2 MUL2 ;cells ADD2 JMP2r
+
+@limit-addr ( -> )
+    .col-bytes LDZ2 .rows LDZ2 MUL2 ;cells ADD2 JMP2r
+
+@min ( x* y* -> min* )
+    LTH2k [ JMP SWP2 ] POP2 JMP2r
+
+@max ( x* y* -> max* )
+    LTH2k [ JMP SWP2 ] NIP2 JMP2r
+
+( signed max )
+( #8000 < #8001 < ... < #ffff < #0000 < #0001 < ... < #7fff )
+@smax ( x* y* -> min* )
+    EOR2k POP #80 AND ?min !max
+
+( initialize screen cells and prepare for first draw )
+@init-screen ( -> )
+    first-addr limit-addr #0200 ( fall-through )
+@init ( start* limit* cell* -> )
+    STH2 EQU2k ?&skip           ( start* limit* [cell*] )
+    #01 .dirty STZ OVR2         ( start* limit* start* [cell*] )
+    #01 SFT2 SWP2 #01 SFT2 SUB2 ( start* -count* [cell*] )
+    STH2 SWP2r STH2r SWP2       ( cell* start* [-count*] )
+    &loop                       ( cell* addr* [-i*] )
+        STA2k INC2 INC2 INC2r   ( cell* addr+2* [-i+1*] )
+        ORAkr STHr ?&loop       ( cell* addr+2* [-i+1*] )
+    &skip POP2 POP2 POP2r JMP2r ( )
+
+( uses the existing .Screen/x and .Screen/y )
+( returns them to their starting values when finished )
+@erase-fg-cell ( -> )
+    #40 .Screen/sprite DEO       ( ; s/s<-40 )
+    .Screen/y DEI2k STH2k        ( zp^ y* [y*] )
+    #0004 ADD2 ROT DEO2          ( [y*] ; s/y<-y+4 )
+    #40 .Screen/sprite DEO STH2r ( y* ; s/s<-40 )
+    .Screen/y DEO2 JMP2r         ( ; s/y<-y )
+
+@draw-border ( -> )
+    ;cp437/space .Screen/addr DEO2
+    #04 .Screen/sprite
+    #0000 draw-border/row
+    #0008 draw-border/row
+    .rows LDZ2 #000c MUL2 #0010 ADD2 draw-border/row
+    .Screen/y DEI2 #0008 ADD2 draw-border/row
+    #0000 draw-border/col
+    #0008 draw-border/col
+    .cols LDZ2 #30 SFT2 #0010 ADD2 draw-border/col
+    .Screen/x DEI2 #0008 ADD2 draw-border/col
+    #00 .Screen/auto DEO POP2 !screen-to-cursor
+
+    &row ( y* -> )
+              .Screen/y DEO2
+        #0000 .Screen/x DEO2
+        #01   .Screen/auto DEO
+        #0000 .cols LDZ2 #0004 ADD2 SUB2 STH2
+        !&loop
+
+    &col ( x* -> )
+              .Screen/x DEO2
+        #0000 .Screen/y DEO2
+        #02   .Screen/auto DEO
+        #0000 .rows LDZ2 #0003 MUL2 INC2 #01 SFT2 #0004 ADD2 SUB2 STH2
+        !&loop
+
+    &loop ( 04 sprite^ [-count] )
+        DEOk INC2r STH2kr ORA ?&loop POP2r JMP2r
+
+@on-redraw ( -> )
+    redraw BRK
+
+@redraw ( -> )
+    .pointer-ttl LDZ #00 EQU ?&pointer-ok ( )
+    .pointer-ttl LDZk INC DUP ROT STZ ?&pointer-ok
+    #01 .dirty STZ ( redraw without pointer )
+    &pointer-ok
+    .dirty LDZ #00 EQU ?&done
+    LIT2r =cells ( [addr*] )
+    .rows LDZ2 #0000 DUP2 .border-pad LDZ2 ADD2 .Screen/y DEO2
+    &yloop
+        .cols LDZ2 #0000 DUP2 .border-pad LDZ2 ADD2 .Screen/x DEO2
+        &xloop
+            STH2kr LDA2 draw-cell erase-fg-cell
+            .Screen/x DEI2k #0008 ( width ) ADD2 ROT DEO2
+            INC2 INC2r INC2r GTH2k ?&xloop
+        POP2 POP2
+        .Screen/y DEI2k #000c ( height ) ADD2 ROT DEO2
+        INC2 GTH2k ?&yloop
+    POP2 POP2 POP2r
+    .is-lit LDZ #00 EQU ?&flashing redraw-selection !&finally
+    &flashing .flash LDZ #00 EQU ?&pointer flash-bell !draw-cursor
+    &pointer draw-pointer
+    &finally draw-cursor #00 .dirty STZ
+    &done JMP2r
+
+@flash-bell ( -> )
+    .flash LDZk #01 SUB SWP STZ ( ; flash<-flash-1 )
+    #0000 DUP2 .lit-click-x STZ2 .lit-click-y STZ2
+    .max-x LDZ2 .lit-drag-x STZ2 .max-y LDZ2 .lit-drag-y STZ2
+    redraw-selection !clear-selection
+
+@screen-to-cell ( row* col* -> )
+    #30 SFT2   ( width )  .border-pad LDZ2 ADD2 .Screen/x DEO2
+    #000c MUL2 ( height ) .border-pad LDZ2 ADD2 .Screen/y DEO2
+    JMP2r
+
+@screen-to-cursor ( -> )
+    .cur-y LDZ2 .cur-x LDZ2 !screen-to-cell
+
+@clear-cursor ( -> )
+    screen-to-cursor cur-addr LDA2 !draw-cell
+
+@draw-cursor ( -> )
+    screen-to-cursor cur-addr LDA2
+    .tcem LDZ #00 EQU ?&skip SWP reverse-tint SWP
+    &skip !draw-cell
+
+@on-button ( -> BRK )
+    .lastkey LDZ ( last^ )
+    .Controller/button DEI ( last^ button^ )
+    STHk EOR ( last-xor-button^ [button^] )
+    STHr AND ( last-xor-button&button^ )
+          DUP #10 AND #00 EQU ?&no-n LIT "A arrow
+    &no-n DUP #20 AND #00 EQU ?&no-s LIT "B arrow
+    &no-s DUP #40 AND #00 EQU ?&no-w LIT "D arrow
+    &no-w DUP #80 AND #00 EQU ?&no-e LIT "C arrow
+    &no-e POP .Controller/button DEI .lastkey STZ BRK
+
+( send ESC [ $c )
+@arrow ( c^ -> )
+    .Console/w STH
+    #1b STHkr DEO LIT "[ STHkr DEO STHr DEO
+    JMP2r
+
+@paste-from-buf ( size* -> )
+    ;paste-buf SWP2 OVR2 ADD2 SWP2 ( limit* start* )
+    &loop                          ( limit* pos* )
+    LDAk .Console/w DEO INC2       ( limit* pos+1* )
+    GTH2k ?&loop POP2 POP2 JMP2r
+
+@bracket-paste ( c^ -> )
+    .Console/w STH
+    #1b STHkr DEO
+    LIT "[ STHkr DEO
+    LIT "2 STHkr DEO
+    LIT "0 STHkr DEO
+    ( c )  STHkr DEO
+    LIT "~ STHr  DEO
+    JMP2r
+
+@paste-snarf ( -> )
+    .paste LDZ #00 EQU ?&start LIT "0 bracket-paste &start
+    ;snarf .File2/name DEO2      ( )
+    #0780 .File2/len DEO2        ( )
+    &loop                        ( )
+        ;paste-buf .File2/r DEO2 ( )
+        .File2/ok DEI2           ( size* )
+        DUP2 #0000 EQU2 ?&failed ( size* )
+        DUP2 paste-from-buf      ( size* )
+        #0780 LTH2 ?&done        ( )
+        !&loop                   ( )
+    &failed POP2
+    &done
+    .paste LDZ #00 EQU ?&end LIT "1 bracket-paste &end
+    JMP2r
+
+@lit-first-y
+    .is-lit-flip LDZ ?&flip .lit-click-y LDZ2 JMP2r &flip .lit-drag-y LDZ2 JMP2r
+@lit-first-x
+    .is-lit-flip LDZ ?&flip .lit-click-x LDZ2 JMP2r &flip .lit-drag-x LDZ2 JMP2r
+@lit-last-y
+    .is-lit-flip LDZ ?&flip .lit-drag-y LDZ2 JMP2r &flip .lit-click-y LDZ2 JMP2r
+@lit-last-x
+    .is-lit-flip LDZ ?&flip .lit-drag-x LDZ2 JMP2r &flip .lit-click-x LDZ2 JMP2r
+
+@redraw-selection ( -> )
+    lit-first-y .cols LDZ2 MUL2                 ( y0*cols* )
+    lit-first-x ADD2 DUP2 ADD2                   ( 2(y0*cols+x0)* )
+    ;cells ADD2 STH2                            ( [addr*] )
+    lit-last-y INC2 lit-first-y                 ( yn* y0* [addr*] )
+    DUP2 lit-first-x STH2k                      ( yn* y0* x0* [addr* x0*] )
+    screen-to-cell                              ( yn* y0* [addr* x0*] )
+    &yloop                                      ( yn* y* [addr* x*] )
+        OVR2 OVR2 INC2 GTH2 STH .cols LDZ2      ( yn* y* cols* [addr* x* last^] )
+        lit-last-x INC2                         ( yn* y* cols* xn* [addr* x* last^] )
+        STHr [ JMP SWP2 ] POP2 STH2r            ( yn* y* xlim* x* [addr*] )
+        &xloop                                  ( yn* y* xlim* x* [addr*] )
+            STH2kr LDA2 highlight-cell          ( yn* y* xlim* x* [addr*] )
+            .Screen/x DEI2k #0008 ADD2 ROT DEO2 ( yn* y* xlim* x* [addr*] )
+            INC2 INC2r INC2r                    ( yn* y* xlim* x+1* [addr+2*] )
+            GTH2k ?&xloop                       ( yn* y* xlim* x+1* [addr+2*] )
+        POP2 POP2                               ( yn* y* [addr+2*] )
+        .Screen/y DEI2k #000c ADD2 ROT DEO2     ( yn* y* [addr+2*] )
+        .border-pad LDZ2 .Screen/x DEO2         ( yn* y* [addr+2*] )
+        LIT2r 0000 INC2 GTH2k ?&yloop           ( yn* y+1* [addr+2* 0*] )
+    POP2 POP2 POP2r POP2r                       ( )
+    JMP2r                                       ( )
+
+@y-point-to-row ( y* -> row* )
+    .border-pad LDZ2 LTH2k ?&y0 SUB2 #000c DIV2 .max-y LDZ2 !min &y0 POP2 POP2 #0000 JMP2r
+
+@x-point-to-col ( x* -> col* )
+    #0004 ADD2 .border-pad LDZ2 LTH2k ?&x0 SUB2 #03 SFT2 .max-x LDZ2 !min &x0 POP2 POP2 #0000 JMP2r
+
+@point-to-coord ( x* y* -> row* col* )
+    y-point-to-row SWP2 !x-point-to-col
+
+@unset-wrap ( -> )
+    #00 .cur-wrap STZ JMP2r
+
+@start-selection ( -> )
+    #01 .is-lit STZ                         ( )
+    .Mouse/x DEI2 .Mouse/y DEI2             ( x* y* )
+    #00 .is-lit-flip STZ                    ( x* y* )
+    point-to-coord                          ( row* col* )
+    DUP2 .lit-click-x STZ2 .lit-drag-x STZ2 ( row* )
+    DUP2 .lit-click-y STZ2 .lit-drag-y STZ2 ( )
+    redraw-selection !draw-cursor           ( )
+
+@selection-is-empty ( -> bool^ )
+    .lit-click-y LDZ2 .lit-drag-y LDZ2 EQU2
+    .lit-click-x LDZ2 .lit-drag-x LDZ2 EQU2 AND JMP2r
+
+@find-natural-end ( y* -> xend* )
+    DUP2 .cols LDZ2 MUL2             ( y* y*cols* )
+    DUP2 ADD2 ;cells ADD2 INC2        ( y* edge* )
+    DUP2 .max-x LDZ2 DUP2 ADD2 ADD2   ( y* edge* start=edge+2cols* )
+    &loop                            ( y* edge* addr* )
+        LDAk ?&done                  ( y* edge* addr* )
+        #0002 SUB2 LTH2k ?&loop      ( y* edge* addr-2* )
+    &done                            ( y* edge* addr* )
+        SWP2 SUB2 #01 SFT2         ( y* x* )
+        NIP2 JMP2r                   ( x* )
+
+@copy-line ( y* x1* x0* -> y* )
+    STH2 STH2 DUP2 find-natural-end    ( y* xend* [x0* x1*] )
+    STH2r min                          ( y* xlim=min(xend,x1)* [x0*] )
+    DUP2 STH2kr GTH2 ?&ok              ( y* xlim* [x0*] )
+    POP2 POP2r JMP2r                   ( y* ; return if line is empty )
+    &ok OVR2 .cols LDZ2 MUL2           ( y* xlim* y*cols* [x0*] )
+    STH2kr ADD2 DUP2 ADD2 ;cells ADD2   ( y* xlim* addr* [x0*] )
+    INC2 STH2 SWP2r STH2r              ( y* xlim* x0* [addr+1*] )
+    SUB2 INC2 #0000 SWP2 SUB2          ( y* -count* [addr+1*] )
+    &loop                              ( y* -i* [pos*] )
+        LDAkr STHr copy-char           ( y* -i* [pos*] )
+        INC2 INC2r INC2r ORAk ?&loop   ( y* -i+1* [pos+2*] )
+    POP2 POP2r JMP2r                   ( y* ; done )
+
+@copy-char ( c^ -> )
+    DUP ?&ok POP #20 ( replace \0 with space )
+    &ok STH ;paste-pos LDA2k ( pos* addr* [c^] )
+    STH2k STAr INC2 SWP2 STA2 JMP2r  ( )
+
+@copy-selection ( -> )
+    ;paste-buf ;paste-pos STA2
+    lit-last-y INC2 lit-first-y                 ( ylim* y0* )
+    DUP2 lit-first-x STH2k screen-to-cell       ( yn* y0* [x0*] )
+    &yloop                                      ( yn* y* [x*] )
+        OVR2 OVR2 INC2 GTH2 STH .max-x LDZ2     ( yn* y* maxx* [x* last^] )
+        lit-last-x                              ( yn* y* maxx* xlast* [x* last^] )
+        STHr [ JMP SWP2 ] POP2 STH2r            ( yn* y* x1* x* )
+        copy-line                               ( yn* y* )
+        LIT2r 0000 INC2 GTH2k ?&next !&done     ( yn* y+1* [0*] )
+    &next                                       ( )
+        #0a copy-char !&yloop                   ( )
+    &done                                       ( )
+        POP2 POP2 POP2r                         ( )
+        ;snarf .File2/name DEO2                 ( )
+        ;paste-pos LDA2 ;paste-buf SUB2         ( len* )
+        .File2/len DEO2                         ( )
+        ;paste-buf .File2/w DEO2                ( )
+        JMP2r                                   ( )
+
+@handle-selection ( -> )
+    selection-is-empty ?&skip copy-selection
+    &skip ( fall through to clear-selection )
+@clear-selection ( -> )
+    #00 .is-lit STZ
+    #00 .is-lit-flip STZ
+    #01 .dirty STZ
+    #0000 DUP2 .lit-click-y STZ2
+          DUP2 .lit-click-x STZ2
+          DUP2 .lit-drag-y STZ2
+               .lit-drag-x STZ2 JMP2r
+
+@update-selection ( -> )
+    .Mouse/x DEI2 .Mouse/y DEI2 point-to-coord  ( row* col* )
+    OVR2 .lit-drag-y STZ2 DUP2 .lit-drag-x STZ2 ( row* col* )
+    OVR2 .lit-click-y LDZ2 LTH2 ?&earlier       ( row* col* )
+    DUP2 .lit-click-x LDZ2 LTH2 ?&earlier       ( row* col* )
+    #00 !&done &earlier #01                     ( row* col* )
+    &done .is-lit-flip STZ POP2 POP2 JMP2r      ( )
+
+@end-selection ( -> )
+    update-selection draw-cursor !handle-selection ( )
+
+@on-click-down ( click^ -> )
+    DUP #01 AND ?&left-click
+    DUP #02 AND ?&middle-click
+                !&done
+    &left-click POP !start-selection
+    &middle-click POP !paste-snarf
+    &done POP JMP2r
+
+@on-click-up ( unclick^ -> )
+    #01 AND ?&left-click !&done
+    &left-click !end-selection
+    &done JMP2r
+
+@draw-at ( x* y* addr* -> )
+    STH2k .Screen/addr DEO2            ( x* y* [addr*] )
+    STH2k .Screen/y DEO2               ( x [addr* y*] )
+    .Screen/x DEO2                     ( [addr* y* x*] )
+    #43 .Screen/sprite DEOk            ( 43 sprite^ [addr* y* x*] )
+    STH2r #0008 ADD2 .Screen/y DEO2    ( 43 sprite^ [addr*] )
+    STH2r #0008 ADD2 .Screen/addr DEO2 ( 43 sprite^ )
+    DEO JMP2r                          ( )
+
+@draw-pointer ( -> )
+    .lastmouse-x LDZ2 .lastmouse-y LDZ2 ( x* y* )
+    .pointer-ttl LDZ ?&visible ;cp437/nul !draw-at
+                      &visible ;cp437/rs  !draw-at
+
+@on-move ( -> )
+    #c4 .pointer-ttl STZ ( pointer visible for ~1 second )
+    .Mouse/x DEI2 .lastmouse-x LDZ2 NEQ2 ?&redraw ( )
+    .Mouse/y DEI2 .lastmouse-y LDZ2 NEQ2 ?&redraw ( )
+    JMP2r                                         ( )
+    &redraw                                       ( )
+    .lastmouse-x LDZ2 .lastmouse-y LDZ2           ( lx* ly* )
+    ;cp437/space draw-at                          ( )
+    .is-lit LDZ #00 EQU ?&next                    ( )
+    update-selection #01 .dirty STZ               ( )
+    &next                                         ( )
+    .Mouse/x DEI2 .Mouse/y DEI2                   ( x* y* )
+    .lastmouse-y STZ2 .lastmouse-x STZ2           ( )
+    draw-pointer !screen-to-cursor                ( )
+
+@on-mouse ( -> BRK )
+    .lastmouse-st LDZ           ( last )
+    .Mouse/state DEI            ( last st )
+    STHk OVR EOR STHkr AND      ( last (last^st)&st [st] )
+    on-click-down               ( last [st] )
+    DUP STHkr EOR AND           ( last&(last^st) [st] )
+    on-click-up                 ( [st] )
+    STHr .lastmouse-st STZ      ( )
+    on-move BRK                 ( )
+
+@on-key ( -> BRK )
+    #00 .pointer-ttl STZ #01 .dirty STZ ( hide pointer )
+    .Controller/key DEI ?&ok !on-button
+    &ok alt ?on-alt-key
+        ctrl ?on-ctrl-key
+    .Controller/key DEI
+    DUP #08 NEQ ?&done
+    POP #7f ( send DEL instead of BS )
+    &done .Console/w DEO BRK
+
+@ctrl ( -> is-down? ) .Controller/button DEI #01 AND JMP2r
+@alt  ( -> is-down? ) .Controller/button DEI #02 AND JMP2r
+
+( alt-XYZ emits ESC and then emits XYZ )
+@on-alt-key ( -> BRK )
+    #1b .Console/w DEO
+    ctrl ?on-ctrl-key
+    .Controller/key DEI .Console/w DEO BRK
+
+( control seqs:   )
+(   ctrl-sp -> 00 )
+(   ctrl-@  -> 00 )
+(   ctrl-a  -> 01 )
+(   ...           )
+(   ctrl-y  -> 19 )
+(   ctrl-z  -> 1a )
+(   ctrl-[  -> 1b )
+(   esc     -> 1b )
+(   ctrl-\  -> 1c )
+(   ctrl-]  -> 1d )
+(   ctrl-^  -> 1e )
+(   ctrl-/  -> 1f )
+(   ctrl-_  -> 1f )
+
+( ctrl-$n emits: )
+(   0 <= $n < @     ->   $n         )
+(   @ <= $n < `     ->   $n #40 SUB )
+(   ` <= $n <= #ff  ->   $n #60 SUB )
+@on-ctrl-key ( -> BRK )
+    .Controller/key DEI
+    DUP #20 EQU ?&nul ( space )
+    DUP #2d EQU ?&us ( '-' i.e. '_' )
+    DUP #2f EQU ?&nul ( '/' )
+    DUP #32 EQU ?&nul ( '2' i.e. '@' )
+    DUP #36 EQU ?&rs ( '6' i.e. '^' )
+    DUP LIT "@ LTH ?&done
+    DUP LIT "` LTH ?&c1
+    LIT "` SUB !&done
+    &nul #00 !&done
+    &rs #1e !&done
+    &us #1f !&done
+    &c1 LIT "@ SUB
+    &done .Console/w DEO BRK
+
+@on-read-priv ( -> BRK )
+    .Console/r DEI
+    DUP LIT "; EQU ?next-arg
+    DUP LIT "0 LTH ?end-arg-priv
+    DUP LIT "9 GTH ?end-arg-priv
+    !add-to-arg
+
+@start-priv ( -> BRK )
+    POP ;on-read-priv .Console/vect DEO2 BRK
+
+@on-read-csi ( -> BRK )
+    .Console/r DEI
+    DUP LIT "? EQU ?start-priv
+    DUP LIT "; EQU ?next-arg
+    DUP LIT "0 LTH ?end-arg
+    DUP LIT "9 GTH ?end-arg
+    !add-to-arg
+
+@on-read-osc ( -> BRK )
+    .Console/r DEI
+    DUP #07 ( bell  ) EQU ?&end-osc
+        #9c ( esc-\ ) EQU ?&end-osc BRK
+    &end-osc ;on-read .Console/vect DEO2 BRK
+    ( TODO: support 7-bit 1b 5c sequence? )
+
+@debug-arg ( n* -> )
+    &short SWP debug-arg/byte
+    &byte DUP #04 SFT debug-arg/char
+    &char #0f AND DUP #09 GTH #27 MUL ADD #30 ADD !scratch-write
+
+@debug-args ( -> )
+    ;args/pos LDA2 ;args
+    &loop
+    #20 scratch-write
+    LDA2k debug-arg/short INC2 INC2
+    LTH2k ?&done !&loop
+    &done POP2 POP2 JMP2r
+
+@debug-priv ( c^ -> )
+    .debug LDZ ?&continue POP JMP2r &continue
+    reset-scratch
+    LIT2r =scratch-write
+    LIT "1 STH2kr JSR2
+    LIT "b STH2kr JSR2
+    #20    STH2kr JSR2
+    LIT "[ STH2kr JSR2
+    #20    STH2kr JSR2
+    LIT "? STH2kr JSR2
+    debug-args
+    #20    STH2kr JSR2
+           STH2kr JSR2
+    #0a    STH2r  JSR2
+    scratch-len .File1/len DEO2
+    ;scratch .File1/w DEO2
+    JMP2r
+
+@end-arg-priv ( c^ -> BRK )
+    ;on-read .Console/vect DEO2
+    DUP LIT "h EQU ?exec-priv-set-or-unset
+    DUP LIT "l EQU ?exec-priv-set-or-unset
+    DUP debug-priv
+    ( TODO: handle these )
+    POP BRK
+
+@exec-priv-set-or-unset ( c^ -> BRK )
+    #0001 read-arg-1 ( c^ n* )
+           DUP2 #0019 NEQ2 ?&!25 POP2 .tcem !&change
+    &!25   DUP2 #07d4 NEQ2 ?&!2004 POP2 .paste !&change
+    &!2004 POP2 debug-priv BRK
+    &change SWP LIT "h EQU SWP STZ BRK ( h is set, l is unset )
+
+@debug-read ( c^ -> )
+    .debug LDZ ?&continue POP JMP2r &continue
+    reset-scratch
+    debug-arg/byte
+    #0a scratch-write
+    scratch-len .File1/len DEO2
+    ;scratch .File1/w DEO2
+    JMP2r
+
+@debug-csi ( c^ -> )
+    .debug LDZ ?&continue POP JMP2r &continue
+    reset-scratch
+    LIT2r =scratch-write
+    LIT "1 STH2kr JSR2
+    LIT "b STH2kr JSR2
+    #20    STH2kr JSR2
+    LIT "[ STH2kr JSR2
+    debug-args
+    #20    STH2kr JSR2
+           STH2kr JSR2
+    #0a    STH2r  JSR2
+    scratch-len .File1/len DEO2
+    ;scratch .File1/w DEO2
+    JMP2r
+
+@end-arg ( c^ -> BRK )
+    ;on-read .Console/vect DEO2
+    DUP debug-csi
+    DUP LIT "@ EQU ?exec-ich   ( insert blank characters )
+    DUP LIT "A EQU ?exec-cuu   ( up )
+    DUP LIT "B EQU ?exec-cud   ( down )
+    DUP LIT "C EQU ?exec-cuf   ( forward )
+    DUP LIT "D EQU ?exec-cub   ( back )
+    DUP LIT "E EQU ?exec-cnl   ( next line $n times )
+    DUP LIT "F EQU ?exec-cpl   ( prev line $n times )
+    DUP LIT "G EQU ?exec-cha   ( move cursor to col )
+    DUP LIT "H EQU ?exec-cup   ( move cursor )
+    DUP LIT "I EQU ?exec-cht   ( forward by tab stops )
+    DUP LIT "J EQU ?exec-ed    ( erase screen )
+    DUP LIT "K EQU ?exec-el    ( erase line )
+    DUP LIT "L EQU ?exec-il    ( insert blank lines )
+    DUP LIT "M EQU ?exec-dl    ( delete n lines )
+    DUP LIT "P EQU ?exec-dch   ( delete n chars )
+    DUP LIT "S EQU ?exec-su    ( scroll up )
+    DUP LIT "T EQU ?exec-sd    ( scroll down )
+    DUP LIT "X EQU ?exec-ech   ( erase $n characters )
+    DUP LIT "Z EQU ?exec-cbt   ( backward by tab stops )
+    DUP LIT "` EQU ?exec-hpa   ( char pos abs col=$n )
+    DUP LIT "a EQU ?exec-hpr   ( char pos rel col=$n )
+    DUP LIT "d EQU ?exec-vpa   ( move cursor to row )
+    DUP LIT "e EQU ?exec-vpr   ( line pos rel row+=$n )
+    DUP LIT "g EQU ?exec-tbc   ( clear tab stops )
+    DUP LIT "h EQU ?exec-sm    ( set mode )
+    DUP LIT "l EQU ?exec-rm    ( reset mode )
+    DUP LIT "m EQU ?exec-sgr   ( set graphical rendering )
+    DUP LIT "n EQU ?exec-dsr   ( device status reports )
+    DUP LIT "r EQU ?exec-set-scrolling-region
+    DUP LIT "s EQU ?exec-scosc ( saved current cursor position )
+    DUP LIT "u EQU ?exec-scorc ( restore saved cursor position )
+    ( = 0 C - normal cursor )
+    ( = 1 C - bold cursor )
+    debug-csi BRK
+
+@exec-set-scrolling-region ( c^ -> BRK ) POP BRK
+
+@exec-tbc ( c^ -> BRK ) POP BRK
+
+@exec-scosc ( c^ -> BRK )
+    POP .cur-x LDZ2 .saved-x STZ2 .cur-y LDZ2 .saved-y STZ2 BRK
+
+@exec-scorc ( c^ -> BRK )
+    POP clear-cursor
+    .saved-x LDZ2 .cur-x STZ2 .saved-y LDZ2 .cur-y STZ2
+    draw-cursor BRK
+
+@mode-addr ( n* -> zp^ )
+             DUP2 #0004 NEQ2 ?&not-irm POP2 .irm JMP2r
+    &not-irm DUP2 #0007 NEQ2 ?&not-awm POP2 .awm JMP2r
+    &not-awm POP2 .ignored JMP2r
+
+@sm ( n* -> ) mode-addr #01 SWP STZ JMP2r
+@rm ( n* -> ) mode-addr #00 SWP STZ JMP2r
+
+( other attributes: )
+( 10 - primary font )
+( 39 - default fg )
+( 49 - default bg )
+@read-attr ( attr* -> )
+    DUP2 #0031 GTH2 ?&skip ( attr* ; skip > 49 )
+    DUP2 ;sgr-fg ADD2 LDA  ( attr* code^ )
+    DUP #40 EQU ?&reset    ( attr* code^ )
+    DUP #80 EQU ?&invert   ( attr* code^ )
+    DUP #ff EQU ?&done     ( attr* code^ )
+    ROT ROT #0027 GTH2 ?&bg
+                .attr LDZ #fc !&update
+    &bg #20 SFT .attr LDZ #f3
+    &update AND ORA .attr STZ !update-tint
+
+    &reset #02 .attr STZ !&done
+    &invert .attr LDZ #80 ORA .attr STZ
+    &done update-tint POP &skip POP2 JMP2r
+
+@sgr-fg  (  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f )
+    ( 00 ) 40 03 01 ff ff ff ff 80 ff ff ff ff ff ff ff ff
+    ( 10 ) ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00 02
+    ( 20 ) 02 02 02 02 02 03 ff 02 00 01 01 01 01 01 01 03
+    ( 30 ) ff 00
+
+@exec-sgr ( c^ -> BRK )
+    POP
+    ;args/pos LDA2 ;args
+    &loop
+    LDA2k read-attr
+    INC2 INC2
+    LTH2k ?&done !&loop
+    &done
+    POP2 POP2 BRK
+
+@exec0 ( addr* -> BRK ) STH2 #0000 read-arg-1 STH2r JSR2 BRK
+@exec1 ( addr* -> BRK ) STH2 #0001 read-arg-1 STH2r JSR2 BRK
+
+@exec-cuu POP ;cuu !exec1
+@exec-cud POP ;cud !exec1
+@exec-cuf POP ;cuf !exec1
+@exec-cub POP ;cub !exec1
+@exec-ich POP ;ich !exec1
+@exec-dl POP ;dl !exec1
+@exec-dch POP ;dch !exec1
+@exec-il POP ;il !exec1
+@exec-cht POP ;cht !exec1
+@exec-cbt POP ;cbt !exec1
+@exec-cnl POP ;cnl !exec1
+@exec-cpl POP ;cpl !exec1
+@exec-su POP ;su !exec1
+@exec-ech POP ;ech !exec1
+@exec-hpa POP ;hpa !exec1
+@exec-hpr POP ;hpr !exec1
+@exec-vpr POP ;vpr !exec1
+@exec-sd POP BRK ( TODO )
+@exec-vpa POP ;vpa !exec1
+@exec-cha POP ;cha !exec1
+@exec-el POP ;el !exec0
+@exec-ed POP ;ed_ !exec0
+@exec-sm POP ;sm !exec1
+@exec-rm POP ;rm !exec1
+@exec-dsr POP ;dsr !exec1
+
+@dsr ( n* -> )
+    #0006 NEQ2 ?&done
+    #1b .Console/w DEO
+    LIT "[ .Console/w DEO
+    .cur-y LDZ2 INC2 emit-dec2
+    LIT "; .Console/w DEO
+    .cur-x LDZ2 INC2 emit-dec2
+    LIT "R .Console/w DEO
+    &done BRK
+
+@cnl ( n* -> ) clear-cursor #0000 .cur-x STZ2 !down-n
+@cpl ( n* -> ) clear-cursor #0000 .cur-x STZ2 !up-n
+@cub ( n* -> ) clear-cursor !back-n
+@cud ( n* -> ) clear-cursor !down-n
+@cuf ( n* -> ) clear-cursor !forward-n
+@cuu ( n* -> ) clear-cursor !up-n
+@hpa ( n* -> ) unset-wrap clear-cursor dec-floor .max-x LDZ2 min .cur-x STZ2 !draw-cursor
+@hpr ( n* -> ) clear-cursor !forward-n
+@vpr ( n* -> ) clear-cursor !down-n
+@vpa ( n* -> ) dec-floor .cur-x LDZ2 !goto
+@cha ( n* -> ) dec-floor .cur-y LDZ2 SWP !goto
+
+@su ( n* -> )
+    #0000 SWP2 SUB2 STH2 clear-cursor    ( [-count*] )
+    &loop scroll INC2r ORAkr STHr ?&loop ( [-i+1*] )
+    POP2r JMP2r                          ( )
+
+@ech ( n* -> )
+    #0000 SWP2 SUB2 STH2        ( [-count*] )
+    #0200 cur-addr              ( 0200 addr* [-count*] )
+    &loop                       ( 0200 pos* [-i*] )
+        STA2k INC2 INC2         ( 0200 pos+2* [-i*] ; pos<-0200 )
+        INC2r ORAkr STHr ?&loop ( pos+2* [-i+1*] )
+    POP2 POP2 POP2r             ( )
+    #01 .dirty STZ JMP2r        ( )
+
+@el ( n* -> )
+    DUP2 #0000 EQU2 ?&erase-to-end
+    DUP2 #0001 EQU2 ?&erase-from-start
+    DUP2 #0002 EQU2 ?&erase-full
+    POP2 JMP2r
+    &erase-full POP2 bol-addr eol-addr !erase
+    &erase-to-end POP2 cur-addr eol-addr !erase
+    &erase-from-start POP2 bol-addr cur-addr !erase
+
+@ed_ ( n* -> )
+    DUP2 #0000 EQU2 ?&erase-to-end
+    DUP2 #0001 EQU2 ?&erase-from-start
+    DUP2 #0002 EQU2 ?&erase-full
+    POP2 JMP2r
+    &erase-full POP2 first-addr limit-addr !erase
+    &erase-to-end POP2 bol-addr limit-addr !erase
+    &erase-from-start POP2 first-addr eol-addr ( fall-through )
+@erase ( start* end* -> ) #0200 !init
+
+@exec-cup ( c^ -> BRK )
+    POP                        ( )
+    #0001 read-arg-1 dec-floor ( row )
+    #0001 read-arg-2 dec-floor ( col )
+    goto BRK                   ( )
+
+@dec-floor ( x* -> x==0 ? 0* : x-1* )
+    #0001 SUB2 #0000 !smax
+
+@debug-esc ( c^ -> )
+    .debug LDZ ?&continue POP JMP2r &continue
+    LIT2r =scratch
+    LIT "1 STH2kr STA INC2r
+    LIT "b STH2kr STA INC2r
+    #20    STH2kr STA INC2r
+           STH2kr STA INC2r
+    #0a    STH2r  STA
+    #0005 .File1/len DEO2
+    ;scratch .File1/w DEO2
+    JMP2r
+
+@on-read-esc ( -> BRK )
+    .Console/r DEI
+    DUP debug-esc
+    DUP LIT "D EQU ?exec-ind
+    DUP LIT "E EQU ?exec-nel
+    DUP LIT "H EQU ?exec-hts
+    DUP LIT "M EQU ?exec-ri
+    DUP LIT "P EQU ?exec-dcs
+    DUP LIT "[ EQU ?start-csi
+    DUP LIT "] EQU ?start-osc
+    DUP LIT "c EQU ?exec-ris
+    DUP LIT "( EQU ?start-charset
+    DUP LIT ") EQU ?start-charset
+    DUP LIT "7 EQU ?&skip ( save cursor )
+    DUP LIT "8 EQU ?&skip ( restore cursor )
+    debug-esc
+    ;on-read .Console/vect DEO2
+    !on-read
+    &skip POP ;on-read .Console/vect DEO2 BRK
+
+@exec-ind ( c^ -> ) POP clear-cursor down-or-scroll BRK
+@exec-nel ( c^ -> ) POP cr BRK
+@exec-hts ( c^ -> ) POP BRK ( TODO )
+@exec-ri ( c^ -> ) POP clear-cursor #0001 up-n BRK
+@exec-dcs ( c^ -> ) POP BRK ( TODO )
+
+@exec-ris ( c^ -> )
+    POP first-addr limit-addr erase
+    reset-terminal BRK
+
+@on-read-skip ( -> BRK )
+    ;on-read .Console/vect DEO2
+    BRK
+
+( '(' = designate G0 charset )
+( ')' = designate G1 charset )
+( '*' = designate G2 charset )
+( '+' = designate G3 charset )
+@start-charset ( c^ -> BRK )
+    POP ;on-read-skip .Console/vect DEO2 BRK
+
+@start-csi ( c^ -> BRK )
+    POP reset-args ;on-read-csi .Console/vect DEO2 BRK
+
+@start-osc ( c^ -> BRK )
+    POP reset-args ;on-read-osc .Console/vect DEO2 BRK
+
+@on-read ( -> BRK )
+    .Console/r DEI read BRK
+
+@read ( c^ -> )
+    DUP debug-read
+    DUP ?&ok POP JMP2r
+    &ok
+    DUP #20 LTH ?read-ctrl
+    DUP #7f EQU ?read-del
+    ( fall through to draw )
+
+@draw ( c^ -> )
+    .tint LDZ SWP DUP2 insert-cell draw-cell
+    .cur-x LDZ2 .max-x LDZ2 EQU2 .cur-wrap STZ
+    clear-cursor !forward
+
+@read-ctrl ( c^ -> )
+    DUP #07 EQU ?read-bel
+    DUP #08 EQU ?read-bs
+    DUP #09 EQU ?read-tab
+    DUP #0a EQU ?read-lf
+    DUP #0b EQU ?read-lf
+    DUP #0c EQU ?read-lf
+    DUP #0d EQU ?read-cr
+    DUP #1b EQU ?read-esc
+    POP JMP2r
+
+@read-bel ( 07 -> )
+    POP .visual-bell LDZ #00 EQU ?&done
+    #06 .flash STZ #01 .dirty STZ
+    &done JMP2r
+
+@read-bs ( 08 -> )
+    POP clear-cursor #0001 !back-n
+
+@read-esc ( 1b -> )
+    POP ;on-read-esc .Console/vect DEO2 JMP2r
+
+@read-del ( 7f -> )
+    POP JMP2r
+
+@read-tab ( 09 -> )
+    POP
+    .cur-x LDZ2          ( x* )
+    NIP #07 AND #08 SUB  ( i=(xlo&7)-8^ )
+    &loop                ( i^ )
+    .tint LDZ #20 DUP2   ( i^ cell* cell* )
+    cur-addr STA2        ( i^ cell* ; addr<-cell )
+    draw-cell            ( i^ )
+    clear-cursor         ( i^ )
+    forward              ( i^ )
+    INC DUP ?&loop       ( i+1^ )
+    POP JMP2r            ( )
+
+@cr ( -> )
+    clear-cursor #0000 .cur-x STZ2 !draw-cursor
+
+@read-cr ( 0d -> )
+    POP .cur-wrap LDZ ?&skip cr &skip JMP2r
+
+@at-max-x ( -> true? ) .cur-x LDZ2 .max-x LDZ2 EQU2 JMP2r
+@at-max-y ( -> true? ) .cur-y LDZ2 .max-y LDZ2 EQU2 JMP2r
+
+@read-lf ( 0a -> )
+    POP !lf
+
+@lf ( -> )
+    .cur-wrap LDZ ?&skip clear-cursor down-or-scroll &skip JMP2r
+
+@goto ( y* x* -> )
+    unset-wrap
+    clear-cursor
+    .max-x LDZ2 min .cur-x STZ2
+    .max-y LDZ2 min .cur-y STZ2
+    !draw-cursor
+
+@forward-n ( n* -> )
+    .cur-x LDZ2 ADD2 .max-x LDZ2 min .cur-x STZ2 !draw-cursor
+
+@back-n ( n* -> )
+    unset-wrap
+    .cur-x LDZ2 SWP2 SUB2 #0000 smax .cur-x STZ2 !draw-cursor
+
+@up-n ( n* -> )
+    .cur-y LDZ2 SWP2 SUB2 #0000 smax .cur-y STZ2 !draw-cursor
+
+@down-n ( n* -> )
+    .cur-y LDZ2 ADD2 .max-y LDZ2 min .cur-y STZ2 !draw-cursor
+
+@forward ( -> ) #0001 !forward-n
+@down ( -> ) #0001 !down-n
+
+@down-or-scroll ( -> ) at-max-y ?&s !down &s !scroll
+
+@maybe-autowrap ( -> )
+    .cur-wrap LDZ #00 EQU ?&skip
+    #00 .cur-wrap STZ
+    clear-cursor
+    #0000 .cur-x STZ2
+    at-max-y ?&scrolling
+    .cur-y LDZ2k INC2 ROT STZ2
+    screen-to-cursor
+    &skip JMP2r
+    &scrolling !scroll
+
+@insert-cell ( cell* -> )
+    maybe-autowrap                ( cell* )
+    .irm LDZ #00 EQU ?&replace    ( cell* )
+    cur-addr                      ( cell* lim* )
+    eol-addr #0002 SUB2           ( cell* lim* last=eol-2* )
+    &loop                         ( cell* lim* pos* )
+        STH2k #0002 SUB2 LDA2k    ( cell* lim* pos-2* cell* [pos*] )
+        STH2r STA2 LTH2k ?&loop   ( cell* lim* pos-2* )
+    POP2 POP2                     ( cell* )
+    &replace                      ( cell* )
+        cur-addr STA2 JMP2r       ( )
+
+@cht ( n* -> )
+    clear-cursor
+    dec-floor #30 SFT2                ( i=(n-1)8* )
+    #0008 .cur-x LDZ2 #0007 AND2 SUB2 ( i* 8-cur%8* )
+    ADD2 !forward-n                   ( )
+
+@cbt ( n* -> )
+    unset-wrap
+    clear-cursor
+    dec-floor #30 SFT2     ( i=(n-1)8* )
+    .cur-x LDZ2 #0007 AND2 ( i* cur%8* )
+    ADD2 !back-n           ( )
+
+@il ( n* -> )
+    .col-bytes LDZ2 MUL2 STH2    ( [i*] )
+    bol-addr                     ( bound* [i*] )
+    limit-addr STH2kr            ( bound* limit* i* [i*] )
+    INC2 INC2 SUB2               ( bound* start=limit-i-2* [i*] )
+    &loop                        ( bound* pos* [i*] )
+        LDA2k OVR2 STH2kr ADD2   ( bound* pos* x* pos+i* [i*] )
+        STA2                     ( bound* pos* [i*] ; pos+i<-x )
+        #0200 OVR2 STA2          ( bound* pos* [i*] ; pos<-0200 )
+        #0002 SUB2               ( bound* pos-2* [i*] )
+        GTH2k #00 EQU ?&loop     ( bound* pos-2* [i*] )
+    POP2 POP2 POP2r              ( )
+    #01 .dirty STZ JMP2r         ( )
+
+@ich ( n* -> )
+    STH2                        ( [n*] )
+    eol-addr #0001 SUB2         ( last* [n*] )
+    STH2kr DUP2 ADD2 SUB2       ( start=last-2n* [n*] )
+    cur-addr SWP2               ( end* start* [n*] )
+    DUP2kr ADD2r                ( end* start* [n* 2n*] )
+    &loop                       ( end* pos* [n* 2n*] )
+        LDA2k OVR2 STH2kr ADD2  ( end* pos* x* pos+2n* )
+        STA2 #0002 SUB2         ( end* pos-2* [n* 2n*] )
+        GTH2k #00 EQU ?&loop    ( end* pos-2* [n* 2n*] )
+        POP2 POP2 POP2r         ( [n*] )
+    LIT2r 0000 SWP2r SUB2r      ( [-n*] )
+    #0200 cur-addr              ( 0200 cur* [-n*] )
+    &loop2                      ( 0200 pos* [-i*] )
+        STA2k INC2 INC2 INC2r   ( 0200 pos+2* [-i+1*] )
+        ORAkr STHr ?&loop2      ( 0200 pos+2* [-i+1*] )
+    POP2 POP2 POP2r             ( )
+    #01 .dirty STZ JMP2r        ( )
+
+( starts with cursor pos )
+@dch ( n* -> )
+    DUP2 ADD2 STH2              ( [i=2n*] )
+    eol-addr STH2kr SUB2        ( limit=eol-i* [i*] )
+    cur-addr                    ( limit* start* [i*] )
+    &loop                       ( limit* pos* [n*] )
+        DUP2 STH2kr ADD2 LDA2k  ( limit* pos* pos+i* x* [i*] )
+        #0200 ROT2 STA2         ( limit* pos* x* [i*] ; pos+i<-0200 )
+        OVR2 STA2 INC2 INC2     ( limit* pos+2* [i*]  ; pos<-x )
+        GTH2k ?&loop            ( limit* pos+2* [i*] )
+    POP2 POP2 POP2r             ( )
+    #01 .dirty STZ JMP2r        ( )
+
+( starts below current line )
+@dl ( n* -> )
+    .col-bytes LDZ2 MUL2 STH2   ( [n*] )
+    limit-addr STH2kr SUB2      ( limit* [n*] )
+    eol-addr                    ( limit* start* [n*] )
+    !dch/loop
+
+@scroll ( -> )
+    limit-addr STH2                      ( [lim*] )
+    ;cells .col-bytes LDZ2 ADD2 STH2     ( [lim* addr*] )
+    &loop                                ( [lim* pos*] )
+        STH2kr LDA2 #0200 STH2kr STA2    ( cell* [lim* pos* cell*] ; pos<-0200 )
+        STH2kr .col-bytes LDZ2 SUB2 STA2 ( [lim* pos*] ; pos-cb<-cell )
+        INC2r INC2r GTH2kr STHr ?&loop   ( [lim* pos+2*] )
+    POP2r POP2r                          ( )
+    #01 .dirty STZ                       ( )
+    !draw-cursor                         ( )
+
+( bits: Rx xx FF BB )
+(  - R: reversed   [0=normal, 1=reversed] )
+(  - F: foreground [0:black, 1:dim, 2:normal, 3:bright] )
+(  - B: background [0:black, 1:dim, 2:normal, 3:bright] )
+@update-tint ( -> )
+    .attr LDZ
+    DUP #80 LTH ?&ok
+    #80 EOR DUP #02 SFT SWP #20 SFT #0c AND ORA
+    &ok .tint STZ JMP2r
+
+@reverse-tint ( tint^ -> tint^ )
+    #0f AND            ( x=tint&0f )
+    DUP #02 SFT SWP    ( x>>2 x )
+    #03 AND #20 SFT    ( x>>2 (x&3)<<2 )
+    ORA                ( res=40|x>>2|(x&3)<<2 )
+    JMP2r              ( res^ )
+
+( to draw a 12 pixel high character we first draw the top )
+( 8 pixels and then we draw the bottom 8 pixels; there is )
+( an overlap of 4 pixels. we do this to avoid drawing too )
+( low which might overwrite characters on the next line. )
+
+( cell* = tint^ c^ )
+@draw-cell ( cell* -> )
+    SWP STH                             ( c^ [tint^] )
+    #00 SWP #40 SFT2 ;cp437 ADD2        ( addr* [tint^] )
+    .Screen/addr DEO2k                  ( addr* s^ [tint^] )
+    STHkr .Screen/sprite DEO            ( addr* s^ [tint^] )
+    .Screen/y DEI2k #0004 ADD2 ROT DEO2 ( addr* s^ [tint^] )
+    STH #0004 ADD2 STHr DEO2            ( [tint^] )
+    STHr .Screen/sprite DEO             ( )
+    .Screen/y DEI2k #0004 SUB2 ROT DEO2 ( )
+    JMP2r                               ( )
+
+@highlight-cell ( cell* -> )
+    NIP LITr 47                         ( c^ [tint^] )
+    #00 SWP #40 SFT2 ;cp437 ADD2        ( addr* [tint^] )
+    .Screen/addr DEO2k                  ( addr* s^ [tint^] )
+    STHkr .Screen/sprite DEO            ( addr* s^ [tint^] )
+    .Screen/y DEI2k #0004 ADD2 ROT DEO2 ( addr* s^ [tint^] )
+    STH #0004 ADD2 STHr DEO2            ( [tint^] )
+    STHr .Screen/sprite DEO             ( )
+    .Screen/y DEI2k #0004 SUB2 ROT DEO2 ( )
+    JMP2r                               ( )
+
+@next-arg ( c^ -> BRK )
+    POP
+    ( TODO: check if we already have max args )
+    ;args/pos LDA2k INC2 INC2 SWP2 STA2 BRK
+
+@add-to-arg ( c^ -> BRK )
+    LIT "0 SUB LITr 00 STH      ( [digit*] )
+    ;args/pos LDA2 LDA2k        ( addr* value* [digit*] )
+    #000a MUL2 STH2r ADD2       ( addr* value*10+digit )
+    SWP2 STA2 BRK
+
+@read-arg-1 ( default* -> n* ) ;args/arg1 LDA2 !max
+@read-arg-2 ( default* -> n* ) ;args/arg2 ( INC2 INC2 ) LDA2 !max
+
+@reset-args ( -> )
+    ;args ;args/pos STA2
+    #0000 ;args LITr f8
+    &loop STA2k INC2 INC2
+    INCr STHkr ?&loop
+    POPr POP2 POP2 JMP2r
+
+( emit a signed short as a decimal )
+@emit-sdec2 ( n* -> )
+    DUP2k #1f SFT2 EQUk ?&s LIT2 "- 18 DEO
+    &s MUL2 SUB2 ( fall-through to emit-dec2 )
+
+( emit an unsigned short as a decimal )
+@emit-dec2 ( n* -> )
+    LITr ff00 &read #000a DIV2k STH2k MUL2 SUB2 STH2r INCr ORAk ?&read
+    POP2 &write NIP #30 ADD #18 DEO OVRr ADDr STHkr ?&write
+    POP2r JMP2r
+
+@debug-log "debug_term.log 00
+@scratch $40 &pos $2
+
+@scratch-write ( c^ -> )
+    ;scratch/pos LDA2 STA
+    ;scratch/pos LDA2k INC2 SWP2 STA2 JMP2r
+@scratch-len ( -> n* )
+    ;scratch/pos LDA2 ;scratch SUB2 JMP2r
+@reset-scratch
+    ;scratch ;scratch/pos STA2 JMP2r
+
+( store up to 8 arguments for control sequences )
+( @args $10 &pos $2 )
+@args [ &arg1 $2 &arg2 $2 &rest $c &pos $2 ]
+
+( 256 chars x 2 tiles/char x 8 bytes/tile = 4096 bytes )
+( second tile only uses top 50% )
+@cp437
+    ~cp437.tal
+
+@snarf ".snarf 00
+
+@meta 00 &body
+    &name "determ 0a
+    &details "ansi 20 "terminal 20 "emulator 0a
+    &author "by 20 "d_m 0a
+    &date "3 20 "jan 20 2023 00
+    02
+    ( device mask ) 41 0d07
+    ( 24x24 icon )  83 =icon-2-bit
+
+@banner-ascii
+    0d 0a
+    20 20 c9 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd bb 0d 0a
+    20 20 ba 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 ba 0d 0a
+    20 20 ba 20 20 "d "e "t "e "r "m 20 20 "v "1 "0 20 20 ba 0d 0a
+    20 20 ba 20 20 20 20 "b "y 20 "d "_ "m 20 20 20 20 20 ba 0d 0a
+    20 20 ba 20 20 "1 "8 20 "m "a "r 20 "2 "0 "2 "3 20 20 ba 0d 0a
+    20 20 ba 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 ba 0d 0a
+    20 20 c8 cd cd cb cd cd cd cd cd cd cd cd cd cb cd cd bc 0d 0a
+    20 20 c9 cb cb ce cb cb cb cb cb cb cb cb cb ce cb cb bb 0d 0a
+    20 20 c8 ca ca ca ca ca ca ca ca ca ca ca ca ca ca ca bc 0d 0a
+    0d 0a 00
+
+@icon-2-bit
+    00 00 00 1f 3f 38 32 34 00 00 00 00 00 07 0f 0f
+    00 00 00 ff ff 00 00 00 00 00 00 00 00 ff ff ff
+    00 00 00 f8 fc 1c 4c 2c 00 00 00 00 00 e0 f0 f0
+    34 30 30 30 30 30 30 30 0f 0f 0f 0f 0f 0f 0f 0f
+    00 00 00 00 00 00 00 00 ff ff ff ff ff ff ff ff
+    2c 0c 0c 0c 0c 0c 0c 0c f0 f0 f0 f0 f0 f0 f0 f0
+    34 34 32 38 3f 1e 07 00 0f 0f 0f 07 00 03 00 00
+    00 00 00 00 ff a0 ff 00 ff ff ff ff 00 ff 00 00
+    2c 2c 4c 1c fc 38 e0 00 f0 f0 f0 e0 00 c0 00 00
+
+( paste buffer )
+@paste-buf $0780 ( max 80 x 24 characters )
+@paste-pos $2
+
+( store tint+char for each screen position )
+@cells ( width x height x 2 bytes )