This is a draft cheat sheet. It is a work in progress and is not finished yet.
Custom Registers
rBGP |
Background Palette Data |
rOBP0 |
Object Palette 0 Data |
rSCY |
Scroll Y |
rSCX |
Scroll X |
These are defined in gbhw.inc.
8-Bit Registers
A |
Accumulator |
B |
8-bit counter |
C |
interface with hardware |
D |
Not used in 8-bit |
E |
Not used in 8-bit |
F |
Flags |
H |
Not used in 8-bit |
L |
Not used in 8-bit |
I |
Interrupt vector |
R |
Refresh |
IXH |
Higher byte of IX |
IXL |
Lower by of IX |
IYH |
Higher byte of IY |
IYL |
Lower byte of IY |
16-Bit Registers
AF |
Not used. |
BC |
Operator on streams. |
DE |
Holds the address of a memory location |
HL |
Common usage. |
PC |
Program counter. |
SP |
Stack pointer. |
IX |
Index register. |
IY |
Index register. |
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Instructions
ld X, Y |
load |
puts Y into X |
rcla |
rotate Left Cir. Acc. |
performs RLC A much quicker |
ret |
return |
pops top of stack |
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