Mike's PCjr Page

Hello
I fallowed guide i found on Mike's page to turn parallel port into bi-directional one on my Tecmar JrCaptain card.
It did not work. Does hack work only for parallel port card only or any card that also has printer port?
Paul

Hello
Memory upgrade process - success
I was able to remove old 64k chips, saved them just in case, i installed sockets and inserted new 256k chips. power on, counter on the screen went to 640
Paul

I did look around for chips from a list and decided to go with SAMSUNG KM41256AP-12 ( there are only $0.40 a piece so not a big pain if wont work ) here is a link https://www.utsource.net/itm/p/1741053.html?digipart=12 At the same time i will install a dip socket if need to return to old chips big t...

Hello
I recently purchased pc Jr with tecmar Jr Capitan side card.
128k memory, clock and parallel port.
I would like to replace 64k bit memory chips with 256k bit,. Current chips are samsug km4164a-20.
Can somebody recommend a 256k-bit chip for that card?
Thx
Paul