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hidden0
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GSU-1 Sram Upgrade on from 256k to 1Mb

by hidden0 Mon Jan 23, 2023 3:15 pm

So just recently did SA1 with the help of so many people able to figure out things just wanted to ask if this topic has been covered cuz i found ziggy’s posts on another forum for gsu2 and did the upgrade was quite simple but cant find pinout or info regarding gsu1
hidden0
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Posts: 61
Joined: Tue Mar 15, 2022 11:00 am

Re: GSU-1 Sram Upgrade on from 256k to 1Mb

by hidden0 Mon Jan 23, 2023 9:53 pm

So the pinout i found does match with The stuntrace FX pcb with 512kb of ram 1CA0N6s but does not match with Starfox board 1CON5S with 256kb.
E.g Pin 79 of GSU-1 chip goes to A0 sram
But Pin 79 of Mario Chip is going to A1 of Sram

Similarly all the pins are slightly off what should i do.
I was thinking if using the 1Mb chip i had put in gsu 2 and SA1 boards in starfox mario chip 1 even though i just need 512kb out of that to make starfox 2 on starfox 1 board since i have many copies.

I dunno why it is like that or if that even matters.
All i can think of is install the 1Mb chip in 1CA05s board with pin 1/2/31/32 hanging put connect 1/2 to the ground Pin 31 A15 to Pin97 of Mario Chip and pin 32 to VCC and it should give me 512KB i believe.

Or is that wrong ?
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hidden0
16-bit
 
Posts: 61
Joined: Tue Mar 15, 2022 11:00 am

Re: GSU-1 Sram Upgrade on from 256k to 1Mb

by hidden0 Tue Jan 24, 2023 1:50 am

Apparently mario chip has complete different pinout then the usual gsu-1 chip

I installed this sram connected the a15 to sram pin 97 as it was in the stunt race cartridge starfox worked fine but when i switch the maskrom to stunt race it is not booting .

Also starfox board lacks the X1
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