Chip-8 All-In-One

This repo homes the All-In-One chip 8 test rom.

This test rom requires the following opcodes:

• All opcodes from the IBM-Logo test rom
• a semi-functional FX0A opcode (just pause execution until a key is released if you don't have this opcode implemented)

All opcodes tested:

Conditionals (Skips)

• 3XNN
• 4XNN
• 5XY0
• 9XY0

Subroutines

• 2NNN
• 00EE

Math Opcodes

• 7XNN
• 8XY0
• 8XY1
• 8XY2
• 8XY3
• 8XY4
• 8XY5
• 8XY6
• 8XY7
• 8XYE

Memory Tests, and Other Misc Tests

• FX1E
• FX55
• FX65

Misc Tests Include:

• A simple out of bounds test
• A VIP System Check

Definitions:

✅ - Pass / Quirk is Enabled
❌ - Fail
➖ - Quirk is Disabled / Skipped Test

"➖" also appears if you don't pass the VIP test; however, the only reason to worry about passing the VIP test is if you're making a Cosmac VIP Emulator.

7XNN Test:

1 - Does the proper function
2 - Is masked with 0xFF (or already wraps around when overflowed)

8XY0, 8XY1, 8XY2 Tests:

1 - Does the proper function
2 - Quirk is enabled
3 - vF is set in the proper order

8XY4, 8XY5, 8XY7 Tests:

1 - Does the proper function
2 - Sets vF correctly on no overflow
3 - Masks vX properly on overflow
4 - Sets vF correctly on overflow
5 - vF works as vX on no overflow
6 - vF works as vX on overflow

8XY6, 8XYE Tests:

1 - Does the proper function
2 - Quirk is enabled
3 - vY stays unchanged
4 - vF is set properly
5 - vF can be used as vY (will show as - if quirk is enabled)
6 - vF can be used as vX

8XYE Specific Tests:

7 - Masks vX properly on overflow
8 - No overflow mask hack on vX (Bit 7 gets cut off properly)

FX55 / FX65 Tests:

1 - Does the proper function
2 - Quirk is enabled for FX55 3 - Quirk is enabled for FX65

FX1E Tests: (Requires 55/65 to work properly)

1 - Does the proper function 2 - Doesn't change vF