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Andrew Alderwick 118afe5fb4 Add debug device. Writing to Debug.stack prints a stack dump; writing to Debug.snapshot makes a snapshot of the running VM and compares it to a previous one if it exists; writing to Debug.exit terminates the VM; and writing to Debug.test_mode activates features handy for automated testing. test_mode is certainly subject to change.		2021-03-22 23:22:47 +00:00
etc	Implemented local templated labels	2021-03-11 15:47:28 -08:00
projects	Add debug device.	2021-03-22 23:22:47 +00:00
.clang-format	*	2021-01-30 14:25:48 -08:00
.gitignore	Added operations to shift tiles	2021-03-06 11:44:18 -08:00
LICENSE	init	2021-01-29 11:17:59 -08:00
README.md	Repaired dev.keys example	2021-03-22 12:33:15 -07:00
assembler.c	Ported examples to new devices addr	2021-03-21 14:16:19 -07:00
build.sh	Add debug device.	2021-03-22 23:22:47 +00:00
emulator.c	Add debug device.	2021-03-22 23:22:47 +00:00
run.sh	Add emulator without SDL window.	2021-03-22 20:36:38 +00:00
uxn.c	Pass Uxn u to poke routines instead of Uint8 m.	2021-03-22 21:22:06 +00:00
uxn.h	Add debug device.	2021-03-22 23:22:47 +00:00

README.md

Uxn

A stack-based VM, written in ANSI C.

Setup

If you wish to build your own emulator, you can create a new instance of Uxn like:

#include "uxn.h"

Uxn u;

if(!bootuxn(&u))
	return error("Boot", "Failed");
if(!loaduxn(&u, argv[1]))
	return error("Load", "Failed");
if(!init())
	return error("Init", "Failed");

evaluxn(u, u->vreset); /* Once on start */
evaluxn(u, u->vframe); /* Each frame

Uxambly

Read more in the Uxambly Guide.

( hello world )

%RTN { JMP2r }

( devices )

|0100 ;Console { pad 8 char 1 byte 1 short 2 }
|01F0 .RESET .FRAME .ERROR ( vectors )
|01F8 [ 13fd 1ef3 1bf2 ] ( palette )

( program )

|0200 @RESET 
	
	,text1 ,print-label JSR2
	,text2 ,print-label JSR2
	#ab =Console.byte
	#cdef =Console.short

BRK

@print-label ( text )
	
	$loop NOP
		( send ) DUP2 LDR =Console.char
		( incr ) #0001 ADD2
		( loop ) DUP2 LDR #00 NEQ ^$loop MUL JMP 
	POP2

RTN    

@text1 [ Welcome 20 to 20 UxnVM 0a00 ]
@text2 [ Hello 20 World 0a00 ] 

@FRAME BRK
@ERROR BRK

TODOs

OS Boot Disk

Load external disk in disk2

Assembler

Includes
Defines
Jump helpers
Implement Peek/Pook to helpers
Create a theme designer application
DateTime device
Document controller.player2

Notes

Palettes

[ 6a03 4a0d aa0c ], purple/cyan
[ a1f3 a14d a16c ], grey-pink/teal

Refs

https://code.9front.org/hg/plan9front/file/a7f9946e238f/sys/src/games/nes/cpu.c http://www.w3group.de/stable_glossar.html http://www.emulator101.com/6502-addressing-modes.html http://forth.works/8f0c04f616b6c34496eb2141785b4454 https://justinmeiners.github.io/lc3-vm/