Chuckphd53 wrote:I upgraded an IBM addon by upgrading the chips, they were soldered in and it took about three hours...
No reason to rush, and make sure you have the right tools, good side cutters to rmove the original chips with out damaging the PCBoard.... If you decide to give it a go, let me know and I can offer some insight.
And I was wishfully hoping the chips were socketed. Ah well -- I might give that a go a little down the road.
I got a Tecmar JrCaptain just because it had socketed ram chips thinking I would put 256k chips in it and when I got it I found out it already had the 256k chips in it.
Now I just need to mod it to get power to it. I figured doing a power mod was easier than desoldering a bunch of chips if I got a IBM memory sidecar.... guess I will find out.
I honestly wouldn't mess with any of the memory sidecars anymore ...
Get a jrIDE. Memory to 736KB with no DRAM refresh cycles interfering with performance, IDE interface, clock/calendar, and goodies we haven't really unlocked yet ... Save the parallel ports because you need those for Zip drives, Xircom adapters, etc.
However, don't trash the memory sidecars. They are fairly easy to upgrade to 512KB ... especially the IBM and Microsoft ones.
I would like one but I'm afraid I have over spent my budget on pcjr, don't know if I can justify more.
Of all the things I bought for my jr, getting the jr-IDE and a 1MB DOM was the best. Second would probably be the CGA to VGA setup to use an LCD monitor. So, if at all possible you should get in on this run.
Enhanced PCjr with a jr-IDE (1GB DOM) and a parallel port side car with a compact flash reader and backpack 1.44mb floppy attached. Tandy video mod.
