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2.4 KiB
2.4 KiB
Terminology
GameBoy terminology.
Terminology
Hardware
https://gbdev.io/pandocs/Specifications.html https://gbdev.io/pandocs/Memory_Map.html
| Name | Modern equivalent | Description |
|---|---|---|
| APU | Audio Processing Unit | |
| PPU | GPU | Pixel Processing Unit |
| Bootrom | BIOS | |
| HRAM (High RAM) | CPU cache | Embedded memory inside the CPU, 127 bytes |
| WRAM (Work RAM) | RAM |
Opcode
| Name | Bits | Sign | Mnemonics | 1 | 2 | 3 | 4 | Description | Note |
|---|---|---|---|---|---|---|---|---|---|
| immediate | 8 | unsigned | d8 | n8 | n | Next byte in memory | |||
| immediate | 16 | unsigned | d16 | n16 | nn | Next byte in memory | little-endian | ||
| register | 8 | unsigned | r8 | r | Any of the registers | ||||
| register | 16 | unsigned | r16 | rr | Any of the registers | little-endian | |||
| address | 8 | unsigned | (n) | Address at value | |||||
| address | 16 | unsigned | a16 | n16 | (nn) | nn | Address at value | little-endian | |
| immediate | 8 | signed | r8 | e8 | e | dd | Next byte in memory | ||
| immediate | 8 | unsigned | (a8) | n16 | (n) | n | 0xff00 + next byte in memory | write to I/O-port | |
| condition | NZ | cc | f | Execute if condition met |
d = data n = constant
Variables
| Name | Meaning |
|---|---|
| size | amount of bytes |
| length | amount of elements |