Mike's PCjr Page

Have you been making anymore progress? Unfortunately no, I've put it on the back burner for the time being as I don't seem to be making any further progress. Also I ended up buying another (this time known working PCjr) which should arrive tomorrow. It was bundled with quite a few extras (2 x keybo...

Finally making some progress. Turns out it was the 14.3mhz crystal that was at fault which I've now replaced with a spare salvaged from a dead Atari board I have. I'm now getting two beeps consistently and my composite display is picking up a signal whereas before it was getting nothing. Still no di...

It looks like I may have stumbled across the problem. Just when I was about to give up and resign myself to needing to find another motherboard, I thought I would play around with the trimmer pot on the off chance it would do something and it did. Unfortunately my multimeter is a cheapy which doesn'...

alanh wrote:Do you have a JR-IDE? Do you get any POST writes?

Unfortunately no I don't have a JR-IDE. Would be very handy to have it's POST code feature but I'm currently limited to just a multimeter and a logic probe so I feel like I'm flying blind at the moment.

Ok it seems I managed to sort out that little issue. Turns out the 12V pin on the PCjr motherboard was slightly out of alignment meaning it wasn't getting a proper connection to the board hence the lack of voltage. I'm now measuring 12V going in the voltage regulator and 5V coming out and the DS1488...

Hi all, I recently received a PCJr Motherboard for a PCJr I'm in the process of gathering all the various parts for to one day hopefully having a fully working PCJr system. The motherboard was purchased under the provision it was untested so I assumed it was most likely faulty and it turns out it wa...

Yes I found his response quite interesting. He's basically offering it to me for a discount but then what would I do with it? I didn't even know what it was!

I just received this response from the seller: It was definitely pulled from a PC jr. After additional research, I am told it goes to a Tekmar/Quadram Drive 2 expansion unit. I don't know if that is true. I raised the price, not because you asked about, but because there do not seem to be any others...

Yeah I figured it didn't seem right. Even if it fitted into the side-card connector it seems like an odd PCB to having hanging out the side.

Out of further curiosity I've emailed the seller to see what's up.

Hi all, I saw this on eBay and out of curiosity I'm wondering what it is. The seller claims in the listing "Pulled from working PC Jr." and while I don't have a full grasp of the inner working of the PCjr and it's attachments, I'm stumped as to where it would fit in and what purpose it ser...