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ROMB (Super FX): Difference between revisions

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'''ROMB''' is a [[Super FX]] instruction that moves a low byte.
{| class="wikitable" style="float:right;clear:right;width:50%"
!colspan="8"|Basic Info
|+
|'''Addressing Mode'''
|'''Opcode'''
|'''Length'''
|'''ROM Speed'''
|'''RAM Speed'''
|'''Cache Speed'''
|+
|[[Implied]] (type 1)
|3FDF
|2 bytes
|6 cycles
|6 cycles
|2 cycles
|}


{| class="wikitable" style="float:right;clear:right;width:30%"
{| class="wikitable" style="float:right;clear:right;width:30%"
!colspan="9"|Flags Clobbered
!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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|.
|.
|}
|}
'''ROMB''' is a [[Super FX]] instruction that moves the low byte of the [[source register]] into [[ROMBR]].
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>
ROMB
</pre>
==== Example ====
Let:
S<sub>reg</sub> : R<sub>5</sub>
R<sub>5</sub> = 0046h
After executing ROMB, the ROMBR becomes 46h.
=== See Also ===
* [[RAMB]]
* [[ALT3]]
=== External Links ===
* Official Nintendo documentation on ROMB: 9.75 on [https://archive.org/details/SNESDevManual/book2/page/n260 Page 2-9-104 of Book II]


[[Category:ASM]]
[[Category:ASM]]
[[Category:Enhancement Chips]]
[[Category:Super FX]]
[[Category:Bank Set-up Instructions]]
[[Category:Two-byte Instructions]]
[[Category:Expects Sreg/Dreg Prearranged]]

Latest revision as of 00:21, 13 July 2024

Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
Implied (type 1) 3FDF 2 bytes 6 cycles 6 cycles 2 cycles
Flags Affected
B ALT1 ALT2 O/V S CY Z
0 0 0 . . . .

ROMB is a Super FX instruction that moves the low byte of the source register into ROMBR.

The source register should be specified in advance using WITH or FROM. Otherwise, R0 serves as the default.

The ALT0 state is restored.

Syntax

ROMB

Example

Let:

Sreg : R5
R5 = 0046h

After executing ROMB, the ROMBR becomes 46h.

See Also

External Links