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RAMB (Super FX): Difference between revisions
From SnesLab
(see also ROMB) |
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{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
|'''Addressing Mode''' | |||
|'''Opcode''' | |'''Opcode''' | ||
|'''Length''' | |'''Length''' | ||
| Line 8: | Line 9: | ||
|'''Cache Speed''' | |'''Cache Speed''' | ||
|+ | |+ | ||
|[[Implied]] (type 1) | |||
|3EDF | |3EDF | ||
|2 bytes | |2 bytes | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|B | |[[B Flag|B]] | ||
|ALT1 | |[[ALT1]] | ||
|ALT2 | |[[ALT2]] | ||
|O/V | |[[O/V]] | ||
|S | |[[Sign Flag|S]] | ||
|CY | |[[CY]] | ||
|Z | |[[Zero Flag|Z]] | ||
|+ | |+ | ||
|0 | |0 | ||
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|} | |} | ||
'''RAMB''' is a [[Super FX]] instruction that moves | '''RAMB''' is a [[Super FX]] instruction that moves the low byte of the [[source register]] into [[RAMBR]]. | ||
The source register should be specified in advance using [[WITH]] or [[FROM]]. Otherwise, R<sub>0</sub> serves as the default. | |||
The [[ALT0]] state is restored. | |||
==== Syntax ==== | |||
<pre> | |||
RAMB | |||
</pre> | |||
==== Example ==== | |||
Let: | |||
S<sub>reg</sub> : R<sub>3</sub> | |||
R<sub>3</sub> = 0170h | |||
After executing RAMB, the RAM bank register becomes 70h. | |||
=== See Also === | === See Also === | ||
* [[ROMB]] | * [[ROMB]] | ||
* [[ALT2]] | |||
* [[SMS]] | |||
* [[SM]] | |||
=== External Links === | === External Links === | ||
* Official Nintendo documentation on RAMB: [https://archive.org/details/SNESDevManual/book2/page/n257 Page 2-9-101 of Book II] | * Official Nintendo documentation on RAMB: 9.73 on [https://archive.org/details/SNESDevManual/book2/page/n257 Page 2-9-101 of Book II] | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Super FX]] | [[Category:Super FX]] | ||
[[Category:Bank Set-up Instructions]] | [[Category:Bank Set-up Instructions]] | ||
[[Category:Two-byte Instructions]] | |||
[[Category:Expects Sreg/Dreg Prearranged]] | |||
Latest revision as of 00:20, 13 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 3EDF | 2 bytes | 6 cycles | 6 cycles | 2 cycles | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
RAMB is a Super FX instruction that moves the low byte of the source register into RAMBR.
The source register should be specified in advance using WITH or FROM. Otherwise, R0 serves as the default.
The ALT0 state is restored.
Syntax
RAMB
Example
Let:
Sreg : R3 R3 = 0170h
After executing RAMB, the RAM bank register becomes 70h.
See Also
External Links
- Official Nintendo documentation on RAMB: 9.73 on Page 2-9-101 of Book II