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ALT1: Difference between revisions
From SnesLab
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* [[STB]] (R<sub>m</sub>) | * [[STB]] (R<sub>m</sub>) | ||
* [[UMULT]] R<sub>n</sub> | * [[UMULT]] R<sub>n</sub> | ||
Many instructions clear the ALT1 flag. | |||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 22:13, 10 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 2) | 3D | 1 byte | 3 cycles | 3 cycles | 1 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| . | 1 | . | . | . | . | . | ||
ALT1 is both the name of a Super FX flag and the flag prefix instruction that sets it. It is bit 8 of the status flag register.
The following instructions require ALT1:
- ADC Rn
- BIC Rn
- CMODE
- DIV2
- GETBH
- LDB (Rm)
- LJMP
- LM Rn, (xx)
- LMS Rn, (yy)
- LMULT
- RPIX
- SBC Rn
- STB (Rm)
- UMULT Rn
Many instructions clear the ALT1 flag.
Syntax
ALT1
See Also
External Links
- Official Nintendo documentation on ALT1: 9.8 on page 2-9-7 of Book II