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Absolute Long Addressing: Difference between revisions
From SnesLab
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(what various operand bytes represent) |
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* [[JMP]] / JML (opcode 5C) | * [[JMP]] / JML (opcode 5C) | ||
* [[JSR]] / JSL (opcode 22) | * [[JSR]] / JSL (opcode 22) | ||
All are four bytes long. This is what the various operand bytes represent: | |||
# low byte of absolute address (byte within page) | |||
# high byte of absolute address (page number) | |||
# bank number | |||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 04:08, 24 July 2024
Absolute Long Addressing is supported by ten instructions:
- ADC (opcode 6F)
- SBC (opcode EF)
- AND (opcode 2F)
- ORA (opcode 0F)
- LDA (opcode AF)
- STA (opcode 8F)
- EOR (opcode 4F)
- CMP (opcode CF)
- JMP / JML (opcode 5C)
- JSR / JSL (opcode 22)
All are four bytes long. This is what the various operand bytes represent:
- low byte of absolute address (byte within page)
- high byte of absolute address (page number)
- bank number
Syntax
LDA long
See Also
References
- Eyes & Lichty page 385, https://archive.org/details/0893037893ProgrammingThe65816/page/385
- section 3.5.7 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.16