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Useful Code Snippets: Difference between revisions
From SnesLab
Vitor Vilela (talk | contribs) (Add GPS/BTSD block template) |
Vitor Vilela (talk | contribs) (Add SA-1 compatibility annotation, add Decompress GFX file) |
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==== Custom block template ==== | ==== Custom block template ==== | ||
by [[User:Alcaro|Alcaro]] | by [[User:Alcaro|Alcaro]] | ||
Works with SA-1. | |||
<pre> | <pre> | ||
| Line 59: | Line 60: | ||
MarioFireball: | MarioFireball: | ||
RTL | RTL | ||
</pre> | |||
==== Decompress GFX File ==== | |||
by [[User:Vitor Vilela|Vitor Vilela] | |||
Works with SA-1. | |||
<pre> | |||
; Decompress input GFX file | |||
; Must be called from SNES CPU. | |||
; SA-1 is automatically invoked on SA-1 Pack ROMs. | |||
STZ $00 | |||
REP #$20 | |||
LDA #$7EAD ; destination buffer = $7EAD00 | |||
STA $01 | |||
LDA #$0080 ; deoompress ExGFX80.bin .. | |||
JSL $0FF900 | |||
</pre> | </pre> | ||
Revision as of 01:25, 26 July 2019
Useful code snippets for the 65c816 ASM and general SNES hardware.
65c816 S-CPU
General
Wait for H-Blank
- BIT $4212 BVS - - BIT $4212 BVC -
Inverse the accumulator (8-bit)
EOR #$FF INC
Inverse the accumulator (16-bit)
EOR #$FFFF INC
SMW Hacking
Custom block template
by Alcaro Works with SA-1.
db $42 ; or db $37 JMP MarioBelow : JMP MarioAbove : JMP MarioSide JMP SpriteV : JMP SpriteH : JMP MarioCape : JMP MarioFireball JMP TopCorner : JMP BodyInside : JMP HeadInside ; JMP WallFeet : JMP WallBody ; if using db $37 MarioBelow: MarioAbove: MarioSide: TopCorner: BodyInside: HeadInside: WallFeet: WallBody: SpriteV: SpriteH: MarioCape: MarioFireball: RTL
Decompress GFX File
by [[User:Vitor Vilela|Vitor Vilela] Works with SA-1.
; Decompress input GFX file ; Must be called from SNES CPU. ; SA-1 is automatically invoked on SA-1 Pack ROMs. STZ $00 REP #$20 LDA #$7EAD ; destination buffer = $7EAD00 STA $01 LDA #$0080 ; deoompress ExGFX80.bin .. JSL $0FF900
65c816 SA-1 CPU
General
Unsigned 16 bit x 16 bit = 32 bit multiplication
by Akaginite
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; 16bit * 16bit Multiplication SA-1 version ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Parameters ; $00-$01 : Multiplicand ; $02-$03 : Multiplier ; Return values ; $04-$07 : Product ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; MathMul16_16: STZ $2250 REP #$20 LDA $00 STA $2251 ASL A LDA $02 STA $2253 BCS + LDA.w #$0000 + BIT $02 BPL + CLC ADC $00 + CLC ADC $2308 STA $06 LDA $2306 STA $04 SEP #$20 RTS