We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS

ALT1: Difference between revisions

From SnesLab
Jump to: navigation, search
(added syntax)
(→‎External Links: added XOR ref)
 
(8 intermediate revisions by the same user not shown)
Line 26: Line 26:
|[[Sign Flag|S]]
|[[Sign Flag|S]]
|[[CY]]
|[[CY]]
|Z
|[[Zero Flag|Z]]
|+
|+
|.
|.
Line 38: Line 38:


'''ALT1''' is both the name of a [[Super FX]] flag and the flag prefix instruction that sets it.  It is bit 8 of the [[status flag register]].
'''ALT1''' is both the name of a [[Super FX]] flag and the flag prefix instruction that sets it.  It is bit 8 of the [[status flag register]].
==== Syntax ====
<pre>
ALT1
</pre>


The following instructions require ALT1:
The following instructions require ALT1:
Line 55: Line 60:
* [[STB]] (R<sub>m</sub>)
* [[STB]] (R<sub>m</sub>)
* [[UMULT]] R<sub>n</sub>
* [[UMULT]] R<sub>n</sub>
* [[XOR]] R<sub>n</sub>
Many instructions clear the ALT1 flag, including:


==== Syntax ====
* [[GSU/ADC|ADC]] R<sub>n</sub>
<pre>
* [[GSU/ADC|ADC]] #n
ALT1
* [[ADD]] R<sub>n</sub>
</pre>
* [[ADD]] #n
* [[GSU/AND|AND]] R<sub>n</sub>
* [[GSU/AND|AND]] #n
* [[ASR]]
* [[BIC]] R<sub>n</sub>
* [[BIC]] #n
* [[CACHE]]
* [[CMODE]]
* [[GSU/CMP|CMP]] R<sub>n</sub>
* [[COLOR]]
* [[GSU/DEC|DEC]] R<sub>n</sub>
* [[DIV2]]
* [[FMULT]]
* [[GETB]]
* [[GETBH]]
* [[GETBL]]
* [[GETBS]]
* [[GETC]]
* [[HIB]]
* [[IBT]] R<sub>n</sub>, #pp
* [[GSU/INC|INC]] R<sub>n</sub>
* [[IWT]] R<sub>n</sub>, #xx
* [[GSU/JMP|JMP]] R<sub>n</sub>
* [[LDB]] (R<sub>m</sub>)
* [[LDW]] (R<sub>m</sub>)
* [[LEA]] R<sub>n</sub>, xx
* [[LINK]] #n
* [[LJMP]] R<sub>n</sub>
* [[GSU/LM|LM]] R<sub>n</sub>, (xx)
* [[LMS]] R<sub>n</sub>, (yy)
* [[LMULT]]
* [[LOB]]
* [[LOOP]]
* [[GSU/LSR|LSR]]
* [[MERGE]]
* [[GSU/MOVE|MOVE]] R<sub>n</sub>, R<sub>n</sub>'
* [[MOVES]] R<sub>n</sub>, R<sub>n</sub>'
* [[MULT]] R<sub>n</sub>
* [[MULT]] #n
* [[GSU/NOP|NOP]]
* [[NOT]]
* [[OR]] R<sub>n</sub>
* [[OR]] #n
* [[PLOT]]
* [[RAMB]]
* [[GSU/ROL|ROL]]
* [[ROMB]]
* [[GSU/ROR|ROR]]
* [[RPIX]]
* [[GSU/SBC|SBC]] R<sub>n</sub>
* [[SBK]]
* [[SEX]]
* [[SM]] (xx), R<sub>n</sub>
* [[SMS]] (yy), R<sub>n</sub>
* [[STB]] (R<sub>m</sub>)
* [[STOP]]
* [[STW]] (R<sub>m</sub>)
* [[SUB]] R<sub>n</sub>
* [[SUB]] #n
* [[SWAP]]
* [[UMULT]] R<sub>n</sub>
* and presumably UMULT #n and XOR too


=== See Also ===
=== See Also ===
Line 65: Line 134:
* [[ALT3]]
* [[ALT3]]
* [[ALT0]]
* [[ALT0]]
* [[Super_FX_Opcode_Matrices#ALT1_=_1,_ALT2_=_0]]


=== External Links ===
=== External Links ===
* Official Nintendo documentation on ALT1: 9.8 on [https://archive.org/details/SNESDevManual/book2/page/n163 page 2-9-7 of Book II]
* Official Nintendo documentation on ALT1: 9.8 on [https://archive.org/details/SNESDevManual/book2/page/n163 page 2-9-7 of Book II]
* Table 2-4-2 on [https://archive.org/details/SNESDevManual/book2/page/n110 page 2-4-4], lbid.
* https://en.wikibooks.org/wiki/Super_NES_Programming/Super_FX_tutorial#Instruction_Set_Table


[[Category:ASM]]
[[Category:ASM]]

Latest revision as of 00:48, 22 July 2024

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

ALT1 is both the name of a Super FX flag and the flag prefix instruction that sets it. It is bit 8 of the status flag register.

Syntax

ALT1

The following instructions require ALT1:

Many instructions clear the ALT1 flag, including:

See Also

External Links