cardiograph-computer/issues/todo.md

To do — Summary

This is a quick todo list.

For extended commentary, see issues.

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

• [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
• (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)
• (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)