IBM PCjr

The DC adapter will almost certainly NOT work. The linear PSU in the PCjr requires AC in order for it to create the +12v +5v and -12v the system requires. I have replaced the PCU in my PCjr with an ATX adapter designed by AkBKukU (See link) and a PicoATX power supply with a 3D printed bracket in the...

OK, the pot I am talking about is down by the motor controller. It is right next to the power transistor is connected to the motor control circuits. It is the speed control pot. Adjusting it did help. The motor wasn't spinning at the correct speed. The one you are thinking about is in the front by t...

OK, I might have been a bit too wordy on my last update. Let me recap my last post. Both the bad drive and the good drive are IBM PCjr OEM devices that came in the machines. Checkit 3 doesn't spin the drive on the disk test. Checkit 2 only does random track tests. So I dug out a newer machine that c...

I tried Checkit 3.0 on my PCjr and its disk alignment program doesn't even spin the disk. This is on the known good drive that I can load games on and play just fine. Checkit 2.1 was able to spin the disk and do random read and random write tests, but it didn't give any useful alignment information....

I have seen those videos. I already know how to align the heads on the drive, it is mechanically very similar to the Commodore 1541. I just need a utility that does read tests as I am adjusting the drive that works on the PCjr. I have tried imagedisk as it has an alignment test, but it does not like...

Hello, This is my first post on the forum. I am searching for a program that will help me align the head on the PCjr floppy drive. I have done this on a Commodore 64 1541 before using a cartridge utility on that system. I have a JR-IDE so I can load software on the CF card without using the floppy d...