Search found 23 matches

by RLumpy
Sun Sep 04, 2022 6:26 pm
Forum: BASIC
Topic: Type in games?
Replies: 8
Views: 3304

Re: Type in games?

99er magazine which originally catered to the Texas Instrument computers later changed it's name to Home Computer Magazine and added support for many other small computers including the PCjr. Here's a link to an FTP site with all the issues scanned in PDF format for download. https://ftp.whtech.com/...
by RLumpy
Tue Apr 26, 2022 3:20 pm
Forum: Racore Drive
Topic: Racore Pwr Supply Repair
Replies: 4
Views: 2931

Re: Racore Pwr Supply Repair

There must have been some issue with noise causing problems with the floppy drive directly below the extender board. The original Jr. drive worked flawlessly with the Quadram chassis removed but had numerous read and write errors when the Quadram chassis was installed. I thought the issue was dirty ...
by RLumpy
Mon Apr 25, 2022 11:26 am
Forum: Racore Drive
Topic: Racore Pwr Supply Repair
Replies: 4
Views: 2931

Re: Racore Pwr Supply Repair

Yes I did check the voltage levels and they are spot on now. Ran the system for about 1/2 an hour and the R10 resistor never got hot so hopefully it is fixed now. Here's a picture of the shielding I installed.
by RLumpy
Mon Feb 21, 2022 12:23 pm
Forum: Sell / Buy / Trade / Free
Topic: Looking for 128K and Quadram softwae/docs
Replies: 0
Views: 4116

Looking for 128K and Quadram softwae/docs

I recently acquired a Quadram 2nd drive expansion with 384K memory for my PCjr however it did not come with any documentation or software. I have the unit setup and working with jrcfg but I would like to find the original software and docs. It can be scanned versions of the docs and a link to downlo...
by RLumpy
Thu Jan 27, 2022 11:32 am
Forum: Design Ideas 💡
Topic: ADLIB/MPU-401 Expansion bay
Replies: 7
Views: 6459

Re: ADLIB/MPU-401 Expansion bay

I have a PDF file that outlines a Serial/MIDI/XT Keyboard/2nd and 3rd floppy multifunction card for the PCjr. I don't know much about this card but here is a link to that PDF. http://www.linearlogix.com/PCJR/PCjr_Combocard.pdf
by RLumpy
Sat Jan 22, 2022 10:42 am
Forum: IBM PCjr Talk ⌨️
Topic: system goes bonkers during autoexec
Replies: 8
Views: 4182

Re: system goes bonkers during autoexec

I wonder if this in an issue that Chuck has written previously about a fanout issue on the PCjr expansion bus. He has shown modifications with pullup resistors for the jride. I would suggest you try removing the 2 parallel port side cars and try with only the jride connected to see if the system beh...
by RLumpy
Wed Nov 10, 2021 10:10 pm
Forum: IBM PCjr Talk ⌨️
Topic: Floppy disk head alignment
Replies: 12
Views: 5244

Re: Floppy disk head alignment

Update: I downloaded and installed this version of Checkit and it works fine on my PCjr.
by RLumpy
Wed Nov 10, 2021 9:42 pm
Forum: IBM PCjr Talk ⌨️
Topic: Floppy disk head alignment
Replies: 12
Views: 5244

Re: Floppy disk head alignment

The last version of Checkit I tried on the PCjr loaded fine but the keyboard did not function. I can't recall the version I tried but I think it was 3.0.
by RLumpy
Tue Oct 05, 2021 10:44 pm
Forum: IBM PCjr Talk ⌨️
Topic: Out for a few days.....
Replies: 4
Views: 3792

Re: Out for a few days.....

Sorry to hear about the health problems but good to hear you are on the mend and back home.
by RLumpy
Sun Sep 26, 2021 12:08 pm
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

OK I'll try to get something written up in the near future.
by RLumpy
Sun Sep 26, 2021 8:58 am
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

Still waiting for the IDE cable but I did solve the 3.5" formatting problem. I ran across some info that said you have to format the drive letter that is setup by driver.sys not the B: drive. For example, on my system when it boots, driver.sys sets up the secondary floppy drive as drive D:. So ...
by RLumpy
Thu Sep 09, 2021 6:13 pm
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

Well I tried the JRIDE all by itself and went through the whole setup again. Cleared the card with debug, booted from my modified DOS 5 floppy and ran FDISK which just hung the system. Rebooted with DOS 3.3 and cleared the card one again with debug then ran DOS 3.3 FDISK and created a 30M partition ...
by RLumpy
Wed Sep 08, 2021 3:42 pm
Forum: Sell / Buy / Trade / Free
Topic: Floppy controller wanted
Replies: 1
Views: 3094

Re: Floppy controller wanted

Thanks to a member here I have the floppy controller and IR receiver I was looking for.
by RLumpy
Sat Sep 04, 2021 9:33 am
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

I haven't had a chance yet to try without the speech and parallel but yes I do have a DOS 5 boot disk working as well as the modified format program. I did read Todd's post and I also used his debug script to clear off the flash cards. As I mentioned, I did have DOS 5 booting and running from the SD...
by RLumpy
Fri Sep 03, 2021 11:46 am
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

I have seen your resistor mod and yes there is a Parallel and a Speech side car attached to the system before the JRIDE. One of the things I was going to try is running the JRIDE by itself. Just have to find some time. The thing that confuses me is if it were a hardware issue, why does DOS 3.3 work ...
by RLumpy
Thu Sep 02, 2021 5:38 pm
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

I tried loading PC-DOS 5 on the SD CARTjr and it worked initially. I followed the same procedure I did with the JRIDE. One quirk is that I had to partition the drive using DOS 3.3 as the fdisk program in DOS 5 just hung the machine. After partitioning, I booted with the DOS 5 disk and used the modif...
by RLumpy
Wed Sep 01, 2021 2:36 pm
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

I will try a regular mechanical drive but first when the floppy controller Ryan sent arrives I will put together that computer and try it on there to eliminate the Jr. as the issue. Strange it would work flawlessly with DOS 3.3 but not with DOS 5. Hmmm, I forgot I have an SD Cartjr with a boot ROM. ...
by RLumpy
Tue Aug 31, 2021 7:17 pm
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

OK I started from the beginning. I first removed any partitions on the drive (using the debug program) and then booted with a DOS 3.3 disk and using the DOS 3.3 debug,I modified the PC-DOS 5.02 boot disk and I also modified the format.com program. I then copied the jrconfig.sys to the DOS 5 boot flo...
by RLumpy
Tue Aug 31, 2021 9:12 am
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

Having a hard time updating to DOS 5 on the jride. I have modified a DOS 5 boot floppy and it boots DOS 5 fine from that floppy. I can then format the Flash card on the jride with the /s switch to transfer the operating system but once that is done, I cannot modify the boot sector of the Flash drive...
by RLumpy
Sun Aug 29, 2021 8:24 pm
Forum: IBM PCjr Talk ⌨️
Topic: 720K floppy
Replies: 21
Views: 9806

Re: 720K floppy

I have read up on modifying DOS 5 so I will give that a try in the near future.

Thanks