Mike's PCjr Page

Here's a video I did.

http://www.youtube.com/watch?v=NxkZ3nRdNss

Can anyone find pin 12/13 on the schematic? I can't find them anywhere. ZM44. Most of ZM44 is on the first page but that's just 4 of the 6 inverters accounted for.

One suggestion I would make for you is remove the motherboard from the case, and do a thorough inspection of all solder joints first thing. I found a few that didn't look too good in my initial attempt to repair mine. Also, try running the motherboard out of the case with the power supply board att...

Have you tried a different display? The composite video output on the back of the PCjr (marked "V") can feed a display or TV set (or an old VCR) with a composite input. You just need a simple cable with an RCA plug on both ends. Even an old audio cable will work. It sure won't be the fine...

Thank you, that should be extremely helpful to me considering there's no ISA slot to plug a POST reader into (and I'd have to buy one first)

(This was in response to the post about reading codes from the serial port)

So I'm sort of stuck on what to test next. I found my old Micronta multimeter has a frequency counter so I probed the CLK pin on the CPU and got 4.77MHz. I guess what I'm wanting to test is where can I probe to get some evidence of brain function? Such as probing some lines on the ROMs to see eviden...

No shorted pins. Can someone tell me, the jumper pins next to the relay that connect to the power supply board. Do they go into the first 2 pins of the 3 pin socket, or last 2 pins? They are not jumper pins - they are grounding pins for the card. Do not jumper them as there are no jumpers anywhere ...

No shorted pins. Can someone tell me, the jumper pins next to the relay that connect to the power supply board. Do they go into the first 2 pins of the 3 pin socket, or last 2 pins?

I will check again, but I'm pretty sure I didn't see any before.

Right now it just the motherboard and power supply board sitting on a table, with no other accessories installed.

James wrote:Maybe the name is a coincidence but are they same person that had a Dell page many years ago?

Hmmm...Could be....

I got my PCJr last week, it doesn't work however (see thread in the hardware section if you think you can help) My first DOS compatible computer was a Tandy 1000HX which is long gone, but this hopefully will fill that void if I can get it working. I work in IT for a living and have been working with...