yamgent / chip8-rust Goto Github PK

Basic:

• 00E0 (clear screen)
• 1NNN (jump)
• 6XNN (set register VX)
• 7XNN (add value to register VX)
• ANNN (set index register I)
• DXYN (display/draw)

Others:

• 0NNN: Execute machine language routine
• 00EE and 2NNN: Subroutines
• 3XNN, 4XNN, 5XY0 and 9XY0: Skip
• 8XY0: Set
• 8XY1: Binary OR
• 8XY2: Binary AND
• 8XY3: Logical XOR
• 8XY4: Add
• 8XY5 and 8XY7: Subtract
• 8XY6 and 8XYE: Shift
• BNNN: Jump with offset
• CXNN: Random
• EX9E and EXA1: Skip if key
• FX07, FX15 and FX18: Timers
• FX1E: Add to index
• FX0A: Get key
• FX29: Font character
• FX33: Binary-coded decimal conversion
• FX55 and FX65: Store and load memory

Ensure that each instruction behaves as we expected.

Sometimes, the beep sound stops and starts abruptly, resulting in a "glitchy" sound. This can be fixed by making the sound fade instead of immediately stopping / starting it.

Our render:

Actual render (from http://mir3z.github.io/chip8-emu/):

In games like PONG the flickering of the paddles is pretty distracting.

Have a TUI debugger that can step through instructions, inspect registers, etc...

Some instructions have ambiguous behaviours. Perhaps a command line argument / JSON config can be provided to change the behaviour of the CPU, for programs that depend on alternative behaviours.

Can also allow configuring other values such as the frequency of the beep.