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Author Topic: Snes sa-1 chip vs cx4 chip  (Read 1973 times)

slidelljohn

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Snes sa-1 chip vs cx4 chip
« on: December 17, 2017, 06:13:12 pm »
So the sa-1 chip on the snes is the most powerful enhancement chip made for the snes. I'm curious if it's possible to program the sa-1 to do the same things that the cx4 chip does? I have been diving into the sa-1 programming for gradius 3 and I was just thinking it would be awesome to add sa-1 to mega man x2 and x3 without messing anything up with them. Does anybody know if the sa-1 chip can do what the cx4 chip does?

KingMike

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Re: Snes sa-1 chip vs cx4 chip
« Reply #1 on: December 18, 2017, 01:36:25 pm »
Isn't the Cx4 chip used mainly for trigonometry?
So the SA1 could probably handle that.
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slidelljohn

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Re: Snes sa-1 chip vs cx4 chip
« Reply #2 on: December 18, 2017, 05:22:06 pm »
I think so. Also for sprite positioning but I'm not really sure if it does anything else. There are docs out there for the cx4. I'm probably just gonna have to do a lot of research on it. It's a hugh task and I'm not really sure if I'm gonna do it. I'll see how this gradius 3 sa-1 hack goes if it turns out good I'll probably consider converting mmx3 to use sa-1 instead of cx4. Even if the sa-1 can't do what the cx4 does I could always just add sa-1 chip to mmx1.