Mike's PCjr Page

THere are a number of web pages that show how to patch the EGA version of Thexder for unlimited energy / invulnerability. It is a matter of changing 4 bytes in a hex editor or using debug. I can't find anything for the PCjr version. I tried loading the PCjr version in debug and searching for the sam...

I can get it to work with CGA grapphics and IBM sound. When I select TGA graphics and TGA or IBM sound, the screen goes black and it crashes. I have 256k.

Sorry for the delay in responding. It is the power cord. I would definitely like to get a new cord, and if you found your extra one, I would be very happy to pay for the shipping!

I bought a multimeter but I'm not sure if I used it right. I set it to AC with a max voltage of 200V. The power cord has 3 terminals. I tried putting the leads into each one and the most reading I got was 1.7 when I tested one side terminal and the middle terminal. THen I tested both side terminals,...

Thanks, I will have to buy a multimeter. Do the fuses often blow?

I had my PCjr plugged into the wall for over a year and I have been using it on and off during that time. It has now stopped turning on. I turn on the switch and nothing happens - no fan, no picture, no sound, not even a hum. The box on the power cord is slightly warm but not hot. Any thoughts on wh...

I'm using my PCjr primarily for 2 things. 1) I wrote a BBS when I was a feshman in college in 1984-85 which was a challenge to me at the time and I like to see it running again once in a while on the real hardware. While it was definitely not of commercial quality, I do like to browse the old messag...

I don't have any experience replacing chips. Is it easy? Also, I was using the 128k sidecar without the power expansion. Could that be the cause of the failure?

I think I found the problem. I saw Mike's post on the vintage computer forum and I unplugged different things. When I unplugged the 64k card on the motherboard, it started up. What can I do about this? Do I need a new 64k card?

Now, I have a different problem. I left the computer on for about 2 hours and when I came back to it, the screen was blank. It would not ctrl-alt-delete, and when I shut it off and turned it on, it immediately beeps twice. The display is blank. The disk does not turn on. Does anyone know what I can ...