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SBK (Super FX): Difference between revisions
From SnesLab
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'''SBK''' is a [[Super FX]] instruction that uses [[Bulk Processing]]. It stores the value in the [[source register]] to the address in the [[Ram Address Cache (Super FX)|ram address cache]]. | '''SBK''' is a [[Super FX]] instruction that uses [[Bulk Processing]]. It stores the value in the [[source register]] to the address in the [[Ram Address Cache (Super FX)|ram address cache]]. | ||
The [[ALT0]] state is restored. | |||
The source register should be specified in advance using [[WITH]] or [[FROM]]. Otherwise, R<sub>0</sub> serves as the default. | The source register should be specified in advance using [[WITH]] or [[FROM]]. Otherwise, R<sub>0</sub> serves as the default. | ||
Revision as of 00:23, 13 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| 90 | 1 byte | 3 to 8 cycles | 7 to 11 cycles | 1 to 6 cycles | |||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
SBK is a Super FX instruction that uses Bulk Processing. It stores the value in the source register to the address in the ram address cache.
The ALT0 state is restored.
The source register should be specified in advance using WITH or FROM. Otherwise, R0 serves as the default.
Syntax
SBK
Example
Let:
(70:3230h) = 51h (70:3231h) = 49h RAMBR = 70h
After executing this program:
LM R1, (3230h) INC R1 SBK
We have:
R1 = 4952h (70:3230h) = 52h (70:3231h) = 49h
External Links
- Official Super Nintendo development manual on SBK: 9.79 on page 2-9-109 of Book II