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GETB (Super FX): Difference between revisions
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'''GETB''' (Get Byte) is a [[Super FX]] instruction that loads one byte from the [[ROM buffer]] into the low byte of the [[destination register]]. The high byte of the destination register is zeroed. | '''GETB''' (Get Byte) is a [[Super FX]] instruction that loads one byte from the [[ROM buffer]] into the low byte of the [[destination register]]. The high byte of the destination register is zeroed. | ||
R<sub>14</sub> serves as the ROM address pointer. | |||
The reason the cycle times can vary is because of the [[ROM buffer]]. | The reason the cycle times can vary is because of the [[ROM buffer]]. | ||
Revision as of 18:58, 3 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| EF | 1 byte | 3 to 8 cycles | 3 to 9 cycles | 1 to 6 cycles | |||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
GETB (Get Byte) is a Super FX instruction that loads one byte from the ROM buffer into the low byte of the destination register. The high byte of the destination register is zeroed.
R14 serves as the ROM address pointer.
The reason the cycle times can vary is because of the ROM buffer.
See Also
External Links
- Official Super Nintendo development manual on GETB: 9.35 on Page 2-9-49 of Book II
- example: page 2-9-50 of Book II, lbid