Juleshsmith
Experienced Member
Hi world. My first time on this forum!
Have just acquired a CBM 8032 (32K) with a video display issue (see pic).
I've read lots of forums about similar issues and know it could be a few things... just need guidance on where to start looking with this one as I really get lost in the technical jargon.
I have only a basic knowledge of electronics, and have real problems understanding schematics. From what I understand it's most likely a video RAM (2114) or memory/ROM issue? I have a second non working 8032 I can use for parts. Could someone explain (in geographical terms) what specific chips I should try and change/swap with my spares (ie which slots to start looking at (for example UC4, UC5 etc)) or any other advice you would recommend given my limited knowledge with vintage computer repairs.
I have basic equipment (and very basic knowledge), but have no idea on how to check if the RAM/ROM chip are faulty (or reset them if they were), so hope to just take the cuplrit chip out and replace with a spare and cross my fingers! Just don't want to make it worse...
The computer beebs when you fire it up, and there is movement on the screen when I press keys. I also get an error beep if I hold the space bar down etc. So I'm pretty confident it's not an issue with the CPU. I've cleaned all the dust off the PCP/tracks and checked for dry joints. I plan to re-seat the seated chips later tonight to see if that helps.
Thx world! Jules (Australia)
Have just acquired a CBM 8032 (32K) with a video display issue (see pic).
I've read lots of forums about similar issues and know it could be a few things... just need guidance on where to start looking with this one as I really get lost in the technical jargon.
I have only a basic knowledge of electronics, and have real problems understanding schematics. From what I understand it's most likely a video RAM (2114) or memory/ROM issue? I have a second non working 8032 I can use for parts. Could someone explain (in geographical terms) what specific chips I should try and change/swap with my spares (ie which slots to start looking at (for example UC4, UC5 etc)) or any other advice you would recommend given my limited knowledge with vintage computer repairs.
I have basic equipment (and very basic knowledge), but have no idea on how to check if the RAM/ROM chip are faulty (or reset them if they were), so hope to just take the cuplrit chip out and replace with a spare and cross my fingers! Just don't want to make it worse...
The computer beebs when you fire it up, and there is movement on the screen when I press keys. I also get an error beep if I hold the space bar down etc. So I'm pretty confident it's not an issue with the CPU. I've cleaned all the dust off the PCP/tracks and checked for dry joints. I plan to re-seat the seated chips later tonight to see if that helps.
Thx world! Jules (Australia)