Mike's PCjr Page

Thanks! That is what I was missing. I have only ever messed with basic on 8bit micro's like the trs80 so I never had a need to look past 64k

Now I can scroll the text I burned to the eprom with:

1 DEF SEG=&HE000
10 FOR A = 1 TO 65534
20 B = PEEK(A)
30 PRINT CHR$(B);
40 NEXT A

With Cartridge BASIC is is possible to peek to different areas of the PCjr from BASIC? I want to read E0000 I have been playing with an eprom burner and a reproduction JR cart pcb. If I burn some text to an eprom and put it in the second socket on the cartage I have I can see the text in dos DEBUG w...

Sorry for the necropost but has anyone ever bothered to try and do the patch?

Most CPM systems only had 128k of ram so this OS would be usable even on a stock Jr.

Well I am happy to report that the Basic Stamp2 software does work fine with the JR-IDE and the PCjr built in RS232
Its able to send a program and receive debug data back from the unit just fine.

OK thanks! I am up and running now :D I am using a 2gig cardflash fdisked for 32megs :lol: PCDOS 3.3 I had some problems following the instructions I found here to zero the MBR. I think the main problem is I don't know how to use MS DEBUG. I found these debug instructions a little more dumbed down t...

ok this is my mess up. :lol: I am going to post what the problem was in case someone else has the same issue. I downloaded the flash and opbin file from retrotronics website. I tried to verify it and it failed. So I did a reflash and it looked like it worked. But still no boot menu. OK so I start lo...

Hello. I picked up a JRIDE from texelec. I noticed when watching a youtube video there is boot menu from the JRIDE that shows the information about detected hard drive. My jrIDE doesnt seem to come up with that. The IBM boot screen counts to 640K then it boots dos. No "Press ESC for menu" ...

OK good to know about the baud limits.
The Stamp2 programs at 9600 baud so it will be interesting to see if that works.
The Stamp1 programs at much less and actually uses the parallel port. Serial data on pin 2 to the Stamp and Serial data on the "BUSY" line for input from the stamp.

Hello all. I have owned my PCjr for years but never did anything with it. Recently I have been playing with these old Micro controllers called Basic Stamp again. I had a lot of fun with them back in the 90s. The original software is DOS based but it needs 256K ram. I hope to be able to use my PCjr t...