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I have a PC 40-III with BIOS ROM versions 390339-05 / 390340-05. These appear to be the latest versions that I was able to locate on Zimmers. The system is an 80286 AT. I am able to set the correct time in CMOS but the date uses a 2 digit year format so going past 1999 doesn't seem possible...

Hi all, I'm looking for a Commodore TV Game unit (either the 2000K or 3000H model is fine). If you have one available, please feel free to reach out. Thanks!

Hi folks, I'm looking to burn a 4K ROM to put in one of the PET 4032 option sockets (i.e. $9000). Any recommendations on which EPROM(s) would be best to use for this nowadays? Thanks!

I have a CRTC PET and the display was working fine for about 30 seconds and then I think I heard a pop and now it simply displays 4 vertical lines with the bottom one flashing (it's the cursor). If I press the return key, the cursor moves down a line. If I clear the screen all the bars go away...

Hi Everyone, This is the flyback in the PET 12" CRT board. I haven't been able to locate a suitable flyback alternative to use as a replacement. Anyone know of something that's available today?

This is the PCB for the 12" displays used in the Dynamic/CRTC PETs. If anyone has the list of caps handy, I'd love to have that as I'm having a tough time confirming things with the very poor quality service manual I'm reading. I'm still painfully working through it but if someone has already...

Can anyone tell me what R612 is? It's the variable resistor for vertical. I need to replace it but there's nothing about it in the service manual so I don't know what to order or what my options are. Thanks!