57 lines
1.4 KiB
Markdown
57 lines
1.4 KiB
Markdown
# To do
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## Research
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- [ ] Learn how the C64's PC gets initialized (what is the initial value? how is it set?)
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- [ ] Review CHIP-8
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- read about the spec / ISA
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- read these, and add them to the bibliography:
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- Steve Losh: https://stevelosh.com/blog/2016/12/chip8-input/
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- https://tonisagrista.com/blog/2021/chip8-spec/
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## Documentation
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- [ ] Improve docs for flags register
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- [ ] Play with JSDoc
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## Design
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- [ ] Add a flag for bank-switching to the ~zero-page
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- [ ] Consider adding a VIP-style keypad-based machine code monitor
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### For consideration
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- [ ] Subroutine stack
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- [ ] [Extended system (secret bonus operations)](2023-08-07--dev-notes.md)
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## Programming
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- [ ] Write some more complex test programs
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- [ ] Display (hex) numbers
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- [ ] Greater than
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- [ ] Minimal LOGO-ish interpreter for turtle graphics
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## Run-scripts
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- [ ] Change interface to run in non-debug mode by default, and use a flag to select debug mode:
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- `./run-cpu.js foo.asm`
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- `./run-cpu.js --debug foo.asm`
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- `./run-cpu.js -d foo.asm`
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## Simulator
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### Assembler
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- [ ] Validate labels
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- [ ] Return pure machine code when printing to stdout (and not in debug mode)
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### CPU
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- [/] Add single-stepping
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- [ ] Make it work with simulated keypad
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### Possible under-the-hood improvements
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- [ ] Do a proper binary version... (or lose the typed arrays?)
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- [ ] Extract debugging to its own module
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- [ ] DRY out addition and subtraction |