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Super FX Opcode Matrices: Difference between revisions

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(→‎ALT1 = 1, ALT2 = 0: CMODE has opcode 3D4E)
Line 138: Line 138:
| 3x || || || || || || || || || || || || || [[LOOP]] || [[ALT1]] || [[ALT2]] || [[ALT3]]
| 3x || || || || || || || || || || || || || [[LOOP]] || [[ALT1]] || [[ALT2]] || [[ALT3]]
|-  
|-  
| 4x || || || || || || || || || || || || || [[PLOT]] || [[SWAP]] || [[COLOR]] || [[NOT]]
| 4x || || || || || || || || || || || || || [[PLOT]] || [[SWAP]] || [[CMODE]] || [[NOT]]
|-  
|-  
| 5x || || || || || || || || || || || || || || || ||
| 5x || || || || || || || || || || || || || || || ||

Revision as of 03:34, 25 May 2023

The Super FX has two prefix flags called ALT1 and ALT2 that alter the way the GSU interprets opcodes. These four opcode matrices will show which instruction actually runs depending on how those prefix flags are set.

ALT1 = 0, ALT2 = 0

x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0x STOP NOP CACHE LSR ROL BRA BGE BLT BNE BEQ BPL BMI BCC BCS BVC BVS
1x
2x
3x LOOP ALT1 ALT2 ALT3
4x PLOT SWAP COLOR NOT
5x
6x
7x MERGE
8x
9x SBK LINK #1 LINK #2 LINK #3 LINK #4 SEX ROR LOB FMULT
Ax
Bx
Cx HIB
Dx GETC
Ex
Fx

ALT1 = 0, ALT2 = 1

x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0x STOP NOP CACHE LSR ROL BRA BGE BLT BNE BEQ BPL BMI BCC BCS BVC BVS
1x
2x
3x LOOP ALT1 ALT2 ALT3
4x PLOT SWAP COLOR NOT
5x
6x
7x MERGE
8x
9x SBK LINK #1 LINK #2 LINK #3 LINK #4 SEX ROR LOB FMULT
Ax
Bx
Cx HIB
Dx GETC
Ex
Fx

ALT1 = 1, ALT2 = 0

x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0x STOP NOP CACHE LSR ROL BRA BGE BLT BNE BEQ BPL BMI BCC BCS BVC BVS
1x
2x
3x LOOP ALT1 ALT2 ALT3
4x PLOT SWAP CMODE NOT
5x
6x
7x MERGE
8x
9x SBK LINK #1 LINK #2 LINK #3 LINK #4 SEX ROR LOB FMULT
Ax
Bx
Cx HIB
Dx GETC
Ex
Fx

ALT1 = 1, ALT2 = 1

x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0x STOP NOP CACHE LSR ROL BRA BGE BLT BNE BEQ BPL BMI BCC BCS BVC BVS
1x
2x
3x LOOP ALT1 ALT2 ALT3
4x PLOT SWAP COLOR NOT
5x
6x
7x MERGE BIC #1 BIC #2 BIC #3 BIC #4 BIC #5 BIC #6 BIC #7 BIC #8 BIC #9 BIC #10 BIC #11 BIC #12 BIC #13 BIC #14 BIC #15
8x
9x SBK LINK #1 LINK #2 LINK #3 LINK #4 SEX ROR LOB FMULT
Ax
Bx
Cx HIB
Dx GETC
Ex
Fx