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Chris Pressey
5 years ago
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The reference implementation can analyze and compile SixtyPical programs to
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6502 machine code.
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Quick Start
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-----------
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If you have the [VICE][] emulator installed, from this directory, you can run
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./loadngo.sh c64 eg/c64/hearts.60p
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and it will compile the [hearts.60p source code](eg/c64/hearts.60p) and
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automatically start it in the `x64` emulator, and you should see:
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You can try the `loadngo.sh` script on other sources in the `eg` directory
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tree. There is an entire small game(-like program) in [demo-game.60p](eg/c64/demo-game.60p).
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Documentation
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-------------
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* Automatic tail-call optimization (could be tricky, w/constraints?)
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* Possibly `ld x, [ptr] + y`, possibly `st x, [ptr] + y`.
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* Maybe even `copy [ptra] + y, [ptrb] + y`, which can be compiled to indirect LDA then indirect STA!
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[VICE]: http://vice-emu.sourceforge.net/
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// Displays 256 hearts at the top of the Commodore 64's screen.
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// Define where the screen starts in memory:
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byte table[256] screen @ 1024
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routine main
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// These are the values that will be written to by this routine:
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trashes a, x, z, n, screen
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{
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ld x, 0
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ld a, 83 // 83 = screen code for heart
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repeat {
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st a, screen + x
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inc x
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} until z // this flag will be set when x wraps around from 255 to 0
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}
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// Displays 256 hearts at the top of the Commodore 64's screen.
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// Define where the screen starts in memory:
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byte table[256] screen @ 1024
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routine main
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// These are the values that will be written to by this routine:
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trashes a, x, z, n, screen
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{
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ld x, 0
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ld a, 83 // 83 = screen code for heart
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repeat {
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st a, screen + x
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inc x
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} until z // this flag will be set when x wraps around from 255 to 0
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}
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