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teenix · (This post was last modified: 08-30-2022 02:00 AM by teenix.)

The faulty ROM will be either 1818-0231 or 1818-0232. I'm not sure which as both of these ROM's I have on the bench have failed RAMs.

I might be able to get a working one to read, if so I will post the serial number.

1818-0228 (67 and 97), has RAM $00 - $0F
1818-0226 (67 and 97), has RAM $10 to $1F
1818-0231 or 1818-0232 (67), have RAM at $20 to $2F, and $30 to $3F but not sure which one.
You need to replace the one with RAM $30 to $3F.

I am making progress on ROM replacements and you never know, I might be able to offer one in the not too distant future. I know my ROM decoder works, but the ones with RAM included are more complex.

cheers

Tony