diff --git a/cli/checksum/build.sh b/cli/checksum/build.sh
index 3c74857..7184cc4 100755
--- a/cli/checksum/build.sh
+++ b/cli/checksum/build.sh
@@ -1,32 +1,25 @@
 #!/bin/sh -e
 
+ID="checksum"
 ASM="uxncli $HOME/roms/drifblim.rom"
 EMU="uxncli"
 LIN="uxncli $HOME/roms/uxnlin.rom"
-
-SRC="checksum.tal"
-DST="checksum.rom"
-
+SRC="${ID}.tal"
+DST="${ID}.rom"
 CPY="$HOME/roms"
 ARG="test.txt"
 
-echo ">> Cleaning"
-
 if [[ "$*" == *"--lint"* ]]
 then
-    echo ">> Linting $SRC"
 	$LIN $SRC
 fi
 
-echo ">> Assembling $SRC"
 $ASM $SRC $DST
 
 if [[ "$*" == *"--save"* ]]
 then
-    echo ">> Saving $DST"
 	cp $DST $CPY
 fi
 
-echo ">> Running $DST"
 $EMU $DST $ARG
 
diff --git a/cli/checksum/checksum.tal b/cli/checksum/checksum.tal
index c454427..4926935 100644
--- a/cli/checksum/checksum.tal
+++ b/cli/checksum/checksum.tal
@@ -1,6 +1,6 @@
 ( uxncli checksum.rom file.bin )
 
-|10 @Console &vector $2 &read $1 &pad $5 &write $1 &error $1
+|10 @Console &vector $2 &read $1 &pad $4 &type $1 &write $1 &error $1
 |a0 @File &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2
 
 |0000
@@ -9,6 +9,14 @@
 
 |0100 ( -> )
 
+	.Console/type DEI ?&on-arg
+	;dict/usage &w LDAk #19 DEO INC2 LDAk ?&w POP2
+	#010f DEO
+
+BRK
+
+&on-arg ( -> )
+
 	;await-src .Console/vector DEO2
 
 BRK
@@ -22,8 +30,10 @@ BRK
 
 @on-ready ( -> )
 
-	;src hash plong #2018 DEO ;src pstr #0a18 DEO
-	#010f DEO
+	;src
+		DUP2 hash plong #2018 DEO
+		pstr #0a18 DEO
+	#800f DEO
 
 BRK
 
@@ -62,4 +72,6 @@ JMP2r
 	&s SWP plong/b
 	&b DUP #04 SFT plong/c
 	&c #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO JMP2r
+@dict
+	&usage "usage: 20 "checksum.rom 20 "input.bin 0a $1