This page is a mirror of Tepples' nesdev forum mirror (URL TBD).
Last updated on Oct-18-2019 Download

Replace Frontloader SRAM

Replace Frontloader SRAM
by on (#172227)
Hi!

I might have to change a broken Ram GM76C28..
Is a GM76C28A compatible?

i checked the datasheets and the GM76C28A Version counts the i/o pins from 0-8
and the other one from 1-7... does this matter?

farnell.com/datasheets/100676.pdf
datasheetarchive.com/dlmain/Datasheets-110/DSAP0015952.pdf

Rgds Dario
Re: Replace Frontloader SRAM
by on (#172239)
The 24-pin 2 KiB RAMs are a standardized pinout. You are unlikely to be able to find one that's incompatible.

But, as long as it looks like:

Pins 1-8, 19, 22, 23: address pins
Pins 9-11, 13-17: data pins
pins 12,18,20,21,24: in order: gnd, /cs, /oe, (r)//w, vcc

It's compatible.
Re: Replace Frontloader SRAM
by on (#172245)
Thats what i wanted to hear.

Thank you!
Re: Replace Frontloader SRAM
by on (#172303)
The RAM is fine.. it wasnt broken

i changed the 74LS and its working again!