Gradius IV Repair (First PCB repair)

[hoagtech]

My beloved Gradius IV was working fine until the weather changed last spring. And now it wont boot up.

On the Checksum it gives the error: 35A BAD!, 32A BAD!

After Taking the Top PCB off,

I tracked down 35A and 32A which were Cypress Semiconductors listed as SRAM.

I googled the Cyprus Semiconductors and found the right voltage but it doesn't say 9721 595831 and arent listed as 1M (128k instead)

​

Cypress Semiconductor Corp - CY7C109-25VC - IC, memory. SRAM 128K x 8.​

 

[Derick2k]

128K x 8 =1M

You got the correct ones, the other numbers are usually date codes, etc..

Let us know how the repair goes, I have 2x GIV boards, always helpful to see repair info.

 

[jepjepjep]

Good luck, @hoagtech! Gradius IV is an underrated gem