ALT0: Difference between revisions

Latest revision as of 00:49, 22 July 2024

ALT0 is scene slang for the Super FX state where both the ALT1 and ALT2 flags are clear. Many instructions restore the ALT0 state, including:

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

References

ares source: https://github.com/ares-emulator/ares/blob/master/ares/component/processor/gsu/disassembler.cpp#L37
Table 2-4-2 on page 2-4-4 of Book II of the official Super Nintendo development manual

@@ Line 1: / Line 1: @@
-'''ALT0''' is scene slang for the [[Super FX]] state where both the [[ALT1]] and [[ALT2]] flags are clear.
+'''ALT0''' is scene slang for the [[Super FX]] state where both the [[ALT1]] and [[ALT2]] flags are clear.  Many instructions restore the ALT0 state, including:
+* [[GSU/ADC|ADC]] R<sub>n</sub>
+* [[GSU/ADC|ADC]] #n
+* [[ADD]] R<sub>n</sub>
+* [[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 ===
 * [[ALT3]]
+* [[Super_FX_Opcode_Matrices#ALT1_=_0,_ALT2_=_0]]
 === References ===
 * ares source: https://github.com/ares-emulator/ares/blob/master/ares/component/processor/gsu/disassembler.cpp#L37
+* Table 2-4-2 on [https://archive.org/details/SNESDevManual/book2/page/n110 page 2-4-4 of Book II] of the official Super Nintendo development manual
 [[Category:ASM]]
 [[Category:Super FX]]
 [[Category:Scene Slang]]