Mike's PCjr Page

Thank you.
Appreciate your response.

Sonny

Hoping someone can assist in identifying PCE modifications shown in the pictures below. Does the TI chip have something to do with video? The POST screen shows a slightly different sharper font when counting memory. Not sure if the F3D2 chip is a modification but it is socketed on this board and my ...

Hello, I am new to EPROM programming and am hoping for some information to successfully program ATMEL AT27C256R / AT28C256 chips being used for IBM PCJR ROMS. I have assembled cartridge kits, purchased Atmel chips, and a GQ-4x4 programmer. There are several options to select when writing a chip. Can...

Thank you!

Trying to get my Jr Bus mouse sidecar and mouse functioning.
I tried the MS mouse driver but it doesn't work.
Guessing there was a custom driver but I haven't been able to find documentation online to confirm.
Any help pointing me in the right direction is greatly appreciated.

Thanks,
Sonny

Jeff, Does your expansion chassis use the pcjr floppy controller or the Racore controller? If its the JR controller cable I believe I have a new one somewhere with my spares. If I have it and it's what you need I do ask that if the cable doesn't resolve your issue that you return it to me to keep in...

Thank you for confirming.

Update-
I was able to boot off 6.22 (both CF and 2.5 SSD) using my secondary system with JRExcellerator installed, PC memory mode enabled.
alanh, thank you for your reply.

Looking for assistance in identifying the 3rd sidecar pictured here.
Any insight is greatly appreciated.

https://vonhelmst.sharepoint.com/:i:/g/ ... A?e=VXtwer

I also tried the PatchDOS utility. It succesfully patched my 5.25 6.22 boot disk and it does boot OS off floppy. I get the following error when attemlting to patch the BOM, CF and 2.5 HD. A fatal error has been encountered: Boot sector read was not successful. I did the boot sector patch, fdisk w.ac...