Mike's PCjr Page

Yeah, I have no idea where I came up with 71 (it may have been unique colours for a particular image). But based on some sample code the number of unique combinations is most likely 85. As some colour combinations end up producing the sample result. I guess that's where the 85 colours for the Tandy ...

Thanks. Correct, by my calculations, there are only 71 unique colours. That's why I state, "greater than 16". When I mentioned 256 that was in regards to the Compute! magazine article. Here's a link: https://www.atarimagazines.com/compute/issue67/327_1_Million-Color_Palette_For_IBM_PC_PCjr...

Hello, I have been playing with a bunch of ideas and one has been to generate more than 16 colours on the PCjr. I used to have a program in the 80s which would generate 256+ colours on the PCjr and I think it was from Compute! Magazine(at least I found something similar there on archive.org). So I d...

Hi Sean,

Sorry, I don't know what's up but I believe the main speaker is in the back corner. The chirping sounds a little like when the wireless keyboard isn't properly communicating. But that may be louder and I don't think I have ever heard it that early in the boot.

Steve

Jason, those brackets look great and are reasonably priced. However, I did create a simple 3D model myself for the JJLKLPT connector. https://www.tinkercad.com/things/cYoawmd2k46 I'll probably create something similar for the display/serial connectors. Note, I could only test the joystick ports. My ...

Hi, Last Christmas I had some time to program a small demo for the PCjr. I have attempted to create something similar to the original Amiga Boing animation but for the PCjr. I have compiled two versions one which runs well with 128KB and another which requires 256KB but includes the grid background....

Yup, the CART screw is important (didn't see that the first time around). So five screws altogether. So I was able to remove the motherboard but one of the tabs was very stiff and the other was loose and may have a hairline fracture but I guess there not critical. Also, on closer inspection, I notic...

Thanks, Chuck, That should be helpful. Another related question, I want to remove the motherboard from the case and it doesn't look obvious as to how, as there seems to be several plastic tabs still holding the motherboard down and I didn't want to try moving it in case they broke. Thanks, Steve

Hi Chuck,

Yes, I would be interested in your detailed procedure. I'm missing the audio pin as well as a couple of ground pins. As well as one on my joystick port.

Thanks,

Steve