Mike's PCjr Page

Your JrCaptain didnt come with sockets? I got 2 JrCaptains and as far as I can tell if it was ordered with full 128kb the chips were soldered in but you could also order them in 0kb and then they came with sockets for future upgrades. Of the 2 JrCaptains I have one has sockets and the other does not...

Well I found that list in " PCjr Power " copyright 1989 by Albert L. Allen So yeah not a new list. Heres another gem from that guide that I'm not sure is worth a try: 3. TECMAR JUNIOR CAPTAIN AT HIGHER SPEEDS In answer to a lot of questions concerning speeding up the Tecmar memory sidecar....

Have you been making anymore progress? I got 2 motherboards here that are both giving me the two beep signal. I have tried piggybacking known good 4164-20 chips on the main ram but that didnt seem to help either one of them. I'm still trying to research before I go blindly probing around the board n...

I did find this in a PCjr guide: 256K DRAM CHIP USING AND HANDLING There are many types of 256K DRAM chips that will work on the junior memory expansions. All should be CAS before RAS refresh and at least 150 ns in speed. Anything faster than 120 ns is probably a waste of money speed wise on the jun...

I have Fujitsu MB81256-15 in my jrCaptain, it came with that.

Here is a link to a list of 41256 class RAM chips.

The only info I have found is here https://www.brutman.com/PCjr/docs/Tecmar_jrCaptain_Installation_v1.3.pdf. The jrWave looks fairly close to a jrCaptain without the Real time clock and parallel port. The wave does seem to have those extra 4 dip switches that the captain does not. I have seen the Te...

That was the same one I was looking at. Kinda sad that the replacement for a PCjr power card and brick is going to cost almost twice as much as getting a power brick off of ebay did. On the bright side the pico psu will offer about double the power the long card does... so that a plus. I think this ...

Its good to have power alternatives.


Seeing the bright blue LED on that power card makes me think about adding RGB to a PCjr....... hmmmm....





(nope)

Does anyone know the differences in JrCaptains? I ended up finding another one that came with a JrCadet. Both of the JrCaptains are the same part # 22502 (128 KB one) and they both have the same revision board inside 200502 Rev C except one has almost all of its chips on the board socketed and the o...

I would love to help you out as thats almost exactly like the Jr I had as a kid with the Racore addon but alas you are looking for some retirement dollars and best I could offer is some retirement quarters.

Best of Luck.