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Gradius III converted to SA-1 ( no slowdown!)
opt2not:
Voultar tweeted today that if you're using a PGA Tour 96 cart as a donor, you gotta also upgrade the SRAM to get Gradius III SA-1 to work correctly. Turns out the 64k of SRAM on those boards is not enough. This is what he recommends: https://www.digikey.com/product-detail/en/IS62C1024AL-35QLI-TR/706-1308-1-ND/4733138/?itemSeq=293511355
I'm going to put in my order. Yay, more surface mount soldering practice. ::) fml
Howard_Casto:
Also somebody alerted ebay that demand might be going up because the price of the carts is now well above what they normally are. Any SA-1s that already have 64k? Perhaps some Japanese carts that nobody has heard of?!?
opt2not:
PGA European Tour is still around $10 on eBay. It’s also SA-1.
opt2not:
--- Quote from: opt2not on May 22, 2019, 05:55:38 pm ---Voultar tweeted today that if you're using a PGA Tour 96 cart as a donor, you gotta also upgrade the SRAM to get Gradius III SA-1 to work correctly. Turns out the 64k of SRAM on those boards is not enough. This is what he recommends: https://www.digikey.com/product-detail/en/IS62C1024AL-35QLI-TR/706-1308-1-ND/4733138/?itemSeq=293511355
I'm going to put in my order. Yay, more surface mount soldering practice. ::) fml
--- End quote ---
So in hindsight, the PGA boards are a lot more work than using a cart with > 64kb of SRAM. The SRAM Voultar suggested has 32 pins, while the original is 28. With this swap you gotta manually wire 2 of the pins to the SA-1 chip, and 1 to a 5v source (the 4th is NC).
Attached is a picture of what needs to be wired to what.
I’m still waiting on the EPROM adapter boards to arrive, but sometime this weekend I’ll try the SRAM adaptation and post my results.
Overall this is a lot more trouble than it’s worth, but I’m “pot committed” right now so I might as well follow through to the end.
opt2not:
Vitor Vilela has done it again, now with Contra III!
https://twitter.com/HackerVilela/status/1180558277735792640
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