CCHIP-8

A Chip 8 emulator written in C.

Currently up to the standards of Super Chip 8 1.1. Next task is to get it up to standards for XOChip.

All Opcodes

CHIP-8

Opcode	Description
00E0	Clear the display
00EE	Return from subroutine
1NNN	Jump to address NNN
2NNN	Call subroutine at NNN
3XKK	Skip next instruction if VX == KK
4XKK	Skip next instruction if VX != KK
5XY0	Skip next instruction if VX == VY
6XKK	Set VX = KK
7XKK	Set VX = VX + KK
8XY0	Set VX = VY
8XY1	Set VX = VX OR VY
8XY2	Set VX = VX AND VY
8XY3	Set VX = VX XOR VY
8XY4	Set VX = VX + VY, VF = carry
8XY5	Set VX = VX - VY, VF = NOT borrow
8XY6	Shift VY right by 1, store in VX, VF = old bit 0
8XY7	Set VX = VY - VX, VF = NOT borrow
8XYE	Shift VY left by 1, store in VX, VF = old bit 7
9XY0	Skip next instruction if VX != VY
ANNN	Set I = NNN
BNNN	Jump to NNN + V0
CXKK	Set VX = random byte AND KK
DXYN	Draw 8xN sprite at (VX, VY), VF = collision
EX9E	Skip next instruction if key VX is pressed
EXA1	Skip next instruction if key VX is not pressed
FX07	Set VX = delay timer
FX0A	Wait for key press, store in VX
FX15	Set delay timer = VX
FX18	Set sound timer = VX
FX1E	Set I = I + VX
FX29	Set I = address of font sprite for digit VX
FX33	Store BCD of VX at I, I+1, I+2
FX55	Store V0-VX in memory starting at I
FX65	Load V0-VX from memory starting at I

SUPER-CHIP 1.1

Opcode	Description
00CN	Scroll display down by N pixels
00FB	Scroll display right by 4 pixels
00FC	Scroll display left by 4 pixels
00FD	Exit the interpreter
00FE	Disable high-res mode (64x32)
00FF	Enable high-res mode (128x64)
DXY0	Draw 16x16 sprite at (VX, VY), VF = collision
FX30	Set I = address of large font sprite for digit VX
FX75	Store V0-VX in RPL user flags (X <= 7)
FX85	Load V0-VX from RPL user flags (X <= 7)