snes enhancement chip reference · superfx sa-1 dsp-1 s-dd1 spc7110 cx4 obc1 s-rtc · features · known games · rom header detection bytes · runs locally
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Super Accelerator 1
Nintendo (65816 clone) · 1994 · 65816 @ 10.74 MHz
clock10.74 MHz
RAM2KB internal + 256KB SRAM
ROMBCD/math assist
header byteROM header co-proc type: $34
detectionROM header $00FFD8 = 0x34
features
65816 at 3.5× SNES speed
BCD arithmetic
bit-map decompression
DMA
memory mapping
known games
Super Mario RPG
Kirby Super Star
Kirby's Dream Land 3
Super Bomberman 3
Marvelous
notes
Acts as a co-CPU alongside the SNES CPU. Both run simultaneously. SA-1 handles heavy computation while SNES handles video. Internal 2KB IRAM is shared between CPUs. Provides fast 65816 + hardware multiply/divide.