# To do — Summary

This is a quick todo list.

For extended commentary, see [issues](issues.md).

## Open

### Todo

- Finish WIP on run-cli arg parsing
- Pass CYCLE_COUNT as a cli arg

- (cpu) !! Fix overflow flag
- Add a flag for bank-switching to the ~zero-page
- Remove run-scripts and add the ability to run `./cpu.js` and `./assembler.js` directly -- cf. [#1](issues.md#1---improve-cli-interface)
- [fix] (cpu) Make single-stepping work with simulated keypad

### Features

- (cpu) allow arrow keys, too
- [fix] (cpu) Execute `JMP $FF` on startup / Implement ROM — see [#2](issues.md#2---startup-execute-jmp-ff)
- (assembler) Validate labels
- (assembler) Extract debugging to its own module
- (cpu) Consider adding a VIP-style keypad-based machine code monitor
- (cpu) Add a mode that prints the display as text, but still animates
- (cpu) Allow running pre-compiled machine code
- (cpu) DRY out addition and subtraction
- [Extended system (secret bonus operations)](../notes/2023-08-07--dev-notes.md)
- (research) Review CHIP-8
    - read about the spec / ISA
    - read these, and add them to the bibliography:
        - Steve Losh: https://stevelosh.com/blog/2016/12/chip8-input/
        - https://tonisagrista.com/blog/2021/chip8-spec/

### Documentation

- Improve docs for flags register

### Testing

- Display (hex) numbers
- Greater than
- Minimal LOGO-ish interpreter for turtle graphics


## Closed

- 2023-08-26 - [fix] (logging) - 'undefined operand' situation is caused by assembling to an initial IP of $1C, which is an odd number
- (assembler) Pass asm line thru to cpu to print when debugging


## Abandoned

- (assembler) Return pure machine code when printing to stdout (and not in debug mode)