Mike's PCjr Page

I assume you're referring to PC Pool Challenges by Dale Jurich, published by IBM? It is a very competent simulation of a pool game; IIRC it has a few different types of pool games you can play, plus it has a wealth of tweakable settings to really screw with how the mechanics of it work. As a kid I p...

If you're ever in the Minneapolis/St Paul area, I have 4 monitors in various condition that I would like to part with. Some of these are hand-me-downs from mbrutman himself when he left the area.

If you get the device too old for LBA stop; jrIDE can't use CHS. Something is not compatible and needs to be replaced. 99.9% of the time, this message simply means that the data being returned from the drive is all zeros or garbage, meaning there is a hardware incompatibility between the drive in u...

Hurray! Glad you got it working. You've joined the club! One could do the wiping of the SD card right there on the PCjr with the help of debug. debug a mov ax, 309 mov cx, 1 mov dx, 80 int 13 int 20 g then reboot. As a terrible teenager, I used to do this to the Tandy machines on display at radio sh...

Have you tried booting to your DOS floppy and typing "fdisk /mbr"? This is typically the fix for drives that work when the machine has been booted via floppy, but will not boot from C:. disclaimer: I am not 100% sure that command is supported in dos 3.3. It definitely works in DOS 5.0 whic...

Interesting. Unless Mike added messages to the jrIDE BIOS that I'm unaware of, there's nothing in the jrIDE BIOS that says "ERROR" with no other information, and definitely nothing in all caps like that. I think you may be onto something with the floppy issue. Don't forget about those buil...

It does not look like there is a method to bypass the BIOS at startup. That was something added into a later version of the BIOS that never made its way over to Mike. I assume the "ERROR" message you're reporting is actually "Error! This drive is too old to support LBA access."? ...

Welcome!
8 carts is actually a pretty significant number.
This is a list of all of them we know about so far:
https://www.brutman.com/PCjr/pcjr_options.html

Mind listing which ones you have and which ones you're missing? I may have some items in my collection that I'd be ok with parting with.

Here ya go: http://www.waste.org/~winkles/jrcartsv5.zip I have not tested this, all I did was hack the .img file directly to modify the loader address from 2000 to 1000. (a single byte change) Which means the loader.asm is now out of sync with the .img file for anyone who dares tread in there. Good ...

When booting with DOS 5.0 I get the likely expected: This drive is too old to support LBA access. This doesn't make sense. The LBA access message is coming from the BIOS, which is in a pre-DOS environment. In other words, the version of DOS in use is not what is causing this message to be displayed.