mirror of https://git.sr.ht/~rabbits/uxn
76 lines
1.4 KiB
Markdown
76 lines
1.4 KiB
Markdown
# Uxn
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A [stack-based VM](https://wiki.xxiivv.com/site/uxn.html), written in ANSI C.
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## Build
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To build the Uxn emulator, you must have [SDL2](https://wiki.libsdl.org/).
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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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```
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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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## Uxambly
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Read more in the [Uxambly Guide](https://wiki.xxiivv.com/site/uxambly.html).
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```
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%RTN { JMP2r }
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( devices )
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|0110 ;Console { vector 2 pad 6 char 1 byte 1 short 2 }
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( program )
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|0200
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,text1 ,print-label JSR2
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,text2 ,print-label JSR2
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#ab =Console.byte
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#cdef =Console.short
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BRK
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@print-label ( text )
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$loop
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( send ) DUP2 PEK2 =Console.char
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( incr ) #0001 ADD2
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( loop ) DUP2 PEK2 #00 NEQ ^$loop JNZ
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POP2
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RTN
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@text1 [ Welcome 20 to 20 UxnVM 0a00 ]
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@text2 [ Hello 20 World 0a00 ]
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```
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## TODOs
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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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- Curl device? 8-bit web browser?
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## Palettes
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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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## 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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https://justinmeiners.github.io/lc3-vm/
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