Search Posts:

OSI 2P Update - RAM OK

View Entire Thread

Return to Threads

SHARE
  by Bill Degnan - 10/02/2010 09:09
I was able to resolve the problem with the prompt, it now correctly says C/W/M ?

BASIC loads to the point of asking for the memory size, but I cannot go any further.

The 16-character wide columns or random characters are still present, the prompt is pushed over 16 characters.

I believe all of the RAM is OK. Voltages in and out seem ok.
I believe the keyboard is OK (except for the 7 key?)

I swapped around the 8T26 chips on both boards, I traded chips' positions (there are 4 on both boards), there was no change. This tells me circumstantially that all 8 chips are OK, but the bus itself may be bad. At least that's what I plan to check next.

I also checked various points for voltages, I need to spend more time and compare with the schematic and chip data sheets.

Reply

Resources:


Buy a Commodore Computer Poster

Popular Topics and FAQs


Past Issues:


MicroPac80 classroom

This image was selected at random from the archive. Click image for more photos and files from this set.