uxn/README.md

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# Uxn
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A [stack-based VM](https://wiki.xxiivv.com/site/uxn.html), written in ANSI C.
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## 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
```
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## Assembly Syntax
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### Assign
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- `@label`, assign the current address to a label.
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- `;variable 2`, assign an address to a label automatically.
- `:const 1a2b`, assign an address to a label manually.
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### Read
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- `,literal`, push label value to stack, prefixed with `LIT LEN`.
- `.pointer`, push label value to stack.
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### Write
- `ADD`, an opcode.
- `#1a`, a literal byte.
- `#12ef`, a literal short.
- `+1a`, a literal signed byte.
- `+12ef`, a literal signed short.
- `-1a`, a literal signed byte(negative).
- `-12ef`, a literal signed short(negative).
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### Special
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- `( comment )`, toggle parsing on/off.
- `|0010`, move to position in the program.
- `"hello`, push literal bytes for word "hello".
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### Operator modes
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- `#1234 #0001 ADD2`, 16-bits operators have the short flag `2`.
- `#12 #11 GTH JMP?`, conditional operators have the cond flag `?`.
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- `+21 -03 MULS`, signed operators have the cond flag `S`.
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```
( comment )
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:dev/w fff9 ( const write port )
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|0100 @RESET
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#00 ,dev/w STR ( set dev/write to console )
,string ( add string pointer to stack )
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@loop
DUP2 LDR IOW ( write pointer value to console )
#0001 ADD2 ( increment string pointer )
DUP2 LDR #00 NEQ ,loop ROT JMP? POP2 ( while *ptr!=0 goto loop )
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BRK
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@string " Hello World " ( add string to memory )
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|c000 @FRAME BRK
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|d000 @ERROR BRK
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|FFFA .RESET .FRAME .ERROR
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```
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## TODOs
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- Li1 short mode
- Defines?
- LDR/STR helpers
- Keyboard example
- PPU chr device
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- Line routine
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- On-screen debugger.
- Auto-advance ldr?
- Getting rid of IOR/IOW would be nice..
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- Sending from the wst to the rst, balance mode/flag?
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- Device that works like an extra memory bank
- [debug]Print unused labels
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## 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
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https://justinmeiners.github.io/lc3-vm/