Mike's PCjr Page

I'm really behind on things and will be a bit out of pocket until a week after VCF-East this coming weekend. I'll follow up then. It's quicker and more reliable to email me at alan at alanlee d org At what booth are you going to be at during VCF East? I plan on going and would love the opportunity ...

Not only is it theoretical but it has been done. PC Enterprises had a power supply that sat in a Drive II assembly and plugged in to the PCjr power slot. I have also heard of people adapting XT power supplies to do the same. I would think a ATX power supply could be jumpered to turn it on and and ad...

Interesting, I have had no issues with my PCE Combo Cartridge and the JrIDE v1? I am also running the PCE jrExcellerator which I think would think would make the problem more likely. I have run the Combo Cartridge with both my jrIDEs in both the PCjr with the jrExcellerator and the one without and h...

Perhaps one of these might work. Like everything on the internet I would scan them with a DOS Virus Scanner before using it.

http://minuszerodegrees.net/rtc.htm

As a XT class machine, does it even have a clock? Early XT class machines had no CMOS or built in clocks. Later XT class machines, such as the IBM PS/2 model 30 (8086), had clocks.

Per a Google search DTK/ERSO XT BIOS 1 short Begin POST and End POST 1 long, 1 short Floppy Disk Drive or Controller Failure Continuous short Parity Error in First 64K RAM Continuous tone First 64K RAM failure 1 long Keyboard Failed or Locked, Interrupt or other system board error *** long short, lo...

I don't believe the 8087 math coprocessor is compatible with the NEC V20. There was a way to add an 8087 to the PCjr but I don't remember the details. Most likely a daughter card with both an 8088 and 8087. How else? Why would you want to add an 8087? The only software I ever found a coprocessor use...

I emailed back and forth with son of the founder of PC Enterprises a couple of years ago. I was hoping to get my hands on a jrExcellerator, display master and Combo v3 (jrVideo, Quicksilver, Keyboard Buffer and Compatibility) cartridge or anything else that might be interesting. He said he looked in...

It might be easier to just contact Larry directly -- it appears he is still living in the same place as the documentation states: http://www.peoplebyname.com/people/Newcomb/Larry/Bethesda/MD Phone number is part of the above. That's good to know. I should probably send him the $10 contribution that...

My main reason for getting the Tandy Mod was to run Prodigy in 16 colors. In CGA Prodigy ran in grayscale. PC Enterprise later modified the Tandy driver to run Prodigy in 16 colors on an unmodified PCjr. There were also a couple of Tandy branded games, Risk and Clue that ran great in Tandy on a modi...