WITH (Super FX): Difference between revisions

Latest revision as of 01:17, 22 July 2024


Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Implied (type 1)	2n^[1]	1 byte			1 cycle


Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
1	.	.	.	.	.	.

WITH is an undocumented^[dubious] (WITH is mentioned on pages 2-2-8 and 2-6-7 of Book II the Nintendo documentation) Super FX instruction that sets the register specified by the operand as both the source register and destination register. It also sets the B flag which makes it a prefix instruction, more specifically for TO and FROM which act like MOVE and MOVES, respectively, with WITH carrying the source and the modified opcode the destination.

Notes

^[1]The opcode lacks a dedicated description in the developer manual, this information comes from fullsnes instead. Furthermore, one can deduce that WITH is this opcode in that it's explicitely mentioned to be the first byte of the MOVE opcode which is documented in the manual.

References

Comprehensive Super FX ASM Guide, part C (Basic operations): https://www.smwcentral.net/?p=viewthread&t=81548
Official Nintendo documentation on Register Prefixes: page 2-6-7 of Book II
fullsnes, SNES Cart GSU-n CPU JMP and Prefix Opcodes: https://problemkaputt.de/fullsnes.txt

@@ Line 1: / Line 1: @@
+{| 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)
+|2n<sup>[1]</sup>
+|1 byte
+|
+|
+|1 cycle
+|}
 {| 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]]
 |+
 |1
-|
+|.
-|
+|.
-|
+|.
-|
+|.
-|
+|.
-|
+|.
 |}
-'''WITH''' is an undocumented{{dubious}} (WITH is mentioned on page 2-2-8 of the Nintendo documentation) [[Super FX]] instruction that sets the register specified by the operand as both the [[source register]] and [[destination register]].
+'''WITH''' is an undocumented<sup>[dubious]</sup> (WITH is mentioned on pages 2-2-8 and 2-6-7 of Book II the Nintendo documentation) [[Super FX]] instruction that sets the register specified by the operand as both the [[source register]] and [[destination register]]. It also sets the B flag which makes it a prefix instruction, more specifically for [[TO]] and [[FROM]] which act like [[MOVE]] and [[MOVES]], respectively, with WITH carrying the source and the modified opcode the destination.
+=== Notes ===
+<sup>[1]</sup>The opcode lacks a dedicated description in the developer manual, this information comes from fullsnes instead. Furthermore, one can deduce that WITH is this opcode in that it's explicitely mentioned to be the first byte of the MOVE opcode which '''is''' documented in the manual.
 === See Also ===
-* [[TO]]
+* [[TO (Super FX)]]
-* [[FROM]]
+* [[FROM (Super FX)]]
 * [[B Flag]]
+* [[MOVE (Super FX)]]
+* [[MOVES (Super FX)]]
+* [[XOR (Super FX)]]
 === References ===
 * ''Comprehensive Super FX ASM Guide'', part C (Basic operations): https://www.smwcentral.net/?p=viewthread&t=81548
+* Official Nintendo documentation on Register Prefixes: [https://archive.org/details/SNESDevManual/book2/page/n129 page 2-6-7 of Book II]
+* fullsnes, SNES Cart GSU-n CPU JMP and Prefix Opcodes: https://problemkaputt.de/fullsnes.txt
 [[Category:ASM]]
 [[Category:Super FX]]
 [[Category:Register Prefix Instructions]]