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@ -11,26 +11,33 @@ GameBoy terminology. |
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| Name | Modern equivalent | Description | |
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| Name | Modern equivalent | Description | |
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|-----------------+-------------------+-------------------------------------------| |
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|-----------------+-------------------+-------------------------------------------| |
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| APU | | Audio Processing Unit | |
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| APU | Sound card | Audio Processing Unit | |
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| PPU | GPU | Pixel Processing Unit | |
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| PPU | GPU | Pixel Processing Unit | |
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| Bootrom | BIOS | | |
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| Bootrom | BIOS | | |
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| HRAM (High RAM) | CPU cache | Embedded memory inside the CPU, 127 bytes | |
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| HRAM (High RAM) | CPU cache | Embedded memory inside the CPU, 127 bytes | |
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| WRAM (Work RAM) | RAM | | |
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| WRAM (Work RAM) | RAM | | |
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*** Flags |
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The Half Cary (H) flag differs between 8-bit or 16-bit operations. The 8-bit |
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variant indicates carry for the lower 4 bits of the result, or overflow from bit |
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4 to bit 5. The 16-bit variant indicates carry for the lower 4 bits of the |
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*second* byte of the result, or overflow from bit 12 to bit 13. |
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*** Opcode |
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*** Opcode |
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| Name | Bits | Sign | Mnemonics | [[https://gbdev.io/gb-opcodes/optables/][1]] | [[https://rgbds.gbdev.io/docs/v0.5.2/gbz80.7/][2]] | [[https://gekkio.fi/files/gb-docs/gbctr.pdf][3]]/[[http://marc.rawer.de/Gameboy/Docs/GBCPUman.pdf][3]] | [[https://gbdev.io/pandocs/CPU_Instruction_Set.html][4]] | Description | Note | |
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| Name | Bits | Sign | Mnemonics | [[https://gbdev.io/gb-opcodes/optables/][1]] | [[https://rgbds.gbdev.io/docs/v0.5.2/gbz80.7/][2]] | [[https://gekkio.fi/files/gb-docs/gbctr.pdf][3]]/[[http://marc.rawer.de/Gameboy/Docs/GBCPUman.pdf][3]] | [[https://gbdev.io/pandocs/CPU_Instruction_Set.html][4]] | Description | Note | |
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|-----------+------+----------+-----------+------+-----+------+-----+------------------------------+-------------------| |
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|-----------+------+----------+-----------+------+-----+------+-----+------------------------------+-------------------| |
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| | | | | <r> | <r> | <r> | <r> | | | |
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| | | | | <r> | <r> | <r> | <r> | | | |
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| immediate | 8 | unsigned | | d8 | n8 | n | | Next byte in memory | | |
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| immediate | 8 | unsigned | i8 | d8 | n8 | n | | Next byte in memory | | |
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| immediate | 16 | unsigned | | d16 | n16 | nn | | Next byte in memory | little-endian | |
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| immediate | 16 | unsigned | i16 | d16 | n16 | nn | | Next byte in memory | little-endian | |
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| register | 8 | unsigned | | | r8 | r | | Any of the registers | | |
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| register | 8 | unsigned | r8 | | r8 | r | | Any of the registers | | |
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| register | 16 | unsigned | | | r16 | rr | | Any of the registers | little-endian | |
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| register | 16 | unsigned | r16 | | r16 | rr | | Any of the registers | little-endian | |
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| address | 8 | unsigned | | | | (n) | | Address at value | | |
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| address | 8 | unsigned | a8 | | | (n) | | Address at value | | |
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| address | 16 | unsigned | | a16 | n16 | (nn) | nn | Address at value | little-endian | |
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| address | 16 | unsigned | a16 | a16 | n16 | (nn) | nn | Address at value | little-endian | |
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| immediate | 8 | signed | | r8 | e8 | e | dd | Next byte in memory | | |
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| immediate | 8 | signed | s8 | r8 | e8 | e | dd | Next byte in memory | | |
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| immediate | 8 | unsigned | | (a8) | n16 | (n) | n | 0xff00 + next byte in memory | write to I/O-port | |
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| immediate | 8 | unsigned | io8 | (a8) | n16 | (n) | n | 0xff00 + next byte in memory | write to I/O-port | |
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| condition | | | | NZ | cc | | f | Execute if condition met | | |
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| condition | | | <ZNHC> | NZ | cc | | f | Execute if condition met | | |
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d = data \\ |
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d = data \\ |
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n = constant |
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n = constant |
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@ -41,6 +48,9 @@ n = constant |
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|--------+--------------------| |
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|--------+--------------------| |
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| length | amount of elements | |
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| length | amount of elements | |
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| size | amount of bytes | |
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| size | amount of bytes | |
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|--------+--------------------| |
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| lhs | left hand side | |
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| rhs | right hand side | |
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** References |
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** References |
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Riyyi
2 years ago