2021-01-29 19:17:59 +00:00
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# Uxn
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2021-03-23 02:04:31 +00:00
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A [stack-based VM](https://wiki.xxiivv.com/site/uxn.html), written in ANSI C.
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2021-01-29 19:35:59 +00:00
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2021-03-23 02:04:31 +00:00
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## Build
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2021-02-12 02:48:45 +00:00
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2021-03-23 02:04:31 +00:00
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To build the Uxn emulator, you must have [SDL2](https://wiki.libsdl.org/).
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2021-02-12 02:48:45 +00:00
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2021-03-23 02:04:31 +00:00
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```sh
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./build.sh
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--debug # Add debug flags to compiler
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--cli # Run rom without graphics
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2021-02-12 02:48:45 +00:00
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```
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2021-03-24 16:39:19 +00:00
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## Emulator Controls
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- `ctrl+h` toggle debugger
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- `alt+h` toggle zoom
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2021-03-12 04:41:35 +00:00
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## Uxambly
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2021-01-29 19:35:59 +00:00
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2021-03-12 04:41:35 +00:00
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Read more in the [Uxambly Guide](https://wiki.xxiivv.com/site/uxambly.html).
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2021-02-06 18:39:13 +00:00
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2021-01-29 19:35:59 +00:00
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```
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2021-04-21 16:48:04 +00:00
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( dev/console )
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2021-03-16 16:27:51 +00:00
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%RTN { JMP2r }
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2021-04-21 16:48:04 +00:00
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( devices )
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|10 @Console [ &pad $8 &char $1 ]
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( init )
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2021-03-21 21:37:39 +00:00
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2021-04-21 16:48:04 +00:00
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|0100 ( -> )
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2021-02-23 21:49:36 +00:00
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2021-04-20 18:32:26 +00:00
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;hello-word ;print JSR2
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2021-02-13 21:21:05 +00:00
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BRK
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2021-02-05 22:01:34 +00:00
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2021-04-20 18:32:26 +00:00
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@print ( addr -- )
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2021-03-11 20:19:59 +00:00
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2021-04-20 18:32:26 +00:00
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&loop
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2021-04-21 18:12:42 +00:00
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( send ) DUP2 GET .Console/char DEO
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2021-03-11 23:47:28 +00:00
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( incr ) #0001 ADD2
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2021-04-21 17:23:58 +00:00
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( loop ) DUP2 GET #00 NEQ ,&loop JNZ
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2021-02-23 21:49:36 +00:00
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POP2
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2021-03-01 17:38:54 +00:00
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2021-04-20 18:32:26 +00:00
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RTN
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2021-04-21 18:12:42 +00:00
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@hello-word "hello 20 "World!
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2021-01-29 19:35:59 +00:00
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```
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2021-02-08 22:49:45 +00:00
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## TODOs
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2021-02-01 19:58:47 +00:00
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2021-04-03 03:40:53 +00:00
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- Shortcut to export/import disk state
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- Implement Uxambly REPL
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- Load disks at a different place than 0x0000.
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2021-04-13 18:38:22 +00:00
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- Curl device? 8-bit web browser?
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2021-04-25 20:47:32 +00:00
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- Replace LTS/GTS? `LTS = #80 ADD SWP #80 ADD SWP LTH`
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- `#80 ADD SWP #80 ADD GTH`
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2021-03-11 20:19:59 +00:00
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2021-03-08 18:30:13 +00:00
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## Palettes
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2021-04-13 18:38:22 +00:00
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- `#6a03` `#4a0d` `#aa0c`, purple/cyan
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- `#a1f3` `#a14d` `#a16c`, grey-pink/teal
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- `#8c4b` `#884b` `#e8bb`, commodore64
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2021-03-08 18:30:13 +00:00
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2021-01-30 22:25:48 +00:00
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## Refs
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https://code.9front.org/hg/plan9front/file/a7f9946e238f/sys/src/games/nes/cpu.c
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http://www.w3group.de/stable_glossar.html
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http://www.emulator101.com/6502-addressing-modes.html
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http://forth.works/8f0c04f616b6c34496eb2141785b4454
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2021-02-06 04:18:30 +00:00
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https://justinmeiners.github.io/lc3-vm/
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