Mike's PCjr Page

Thank you so much for the feedback. It was driving me mad.

All these issues leave me thinking that my PCjr is somehow spotty, but I'm realizing that it's just a Pcjr.

Is there any reason why this wouldn't work on a gotek drive? I can't seem to get it to work. The menu loads, but when I push a button to select a game, nothing.

Keep in mind that this might just be a bad DRAM chip. During the boot process the machine scans for memory by writing a pattern and then trying to read it back. A read error will break the search. So what should be a 128KB sidecar might only show up as 64KB because one of the DRAMs in the second ba...

In case anyone was waiting in suspense, I can only get 64kb to work in the Captain. A true bummer. The first bank of 64k seems to work fine, but no response from the second one. There is some corrosion on one of the PLAs or PALs...whatever it is, don't have it in front of me right now. Cleaned the l...

Spent a precious few minutes on this this evening. Found a 5v DC power supply. Found a spot where I could easily jump its input to the 5v line... Powered up...and...190-some kb of RAM reporting? Harrumph, but still better than 128kb. I checked my power supply, only .2 amps. Per the manual, it draws ...

For the record, I really looked for a mod. Searched this forum, usenet archives and every instance of the PCjr newsletter. The only relevant result is this: https://computerarchive.org/files/computer/magazines/jrNewsletter/1991s/January%201991(s).pdf If one looks deep, they'll find reference to some...

Greetings. New PCjr user here. I have a 128k system with a Tecmar Jr Captain and Cadet...or do I? I can't figure out if the sidecars work. 1) Will these do anything without the Captain's external power supply? 2) Can anyone point me to the mod for this to run it off the Jr's power? I can find refere...