Recent content by bryanc806

I've tried both of those things. I'm pretty sure that MCL6809 is spending most of its time in the BIU functions based on some debugging steps I've put in there. In any case at 1GHz, it does the same thing. I think there may be a runt pulse when the clock switches speeds, but I need to get my...

I have constructed an MCL6809 from the github repo and it works on my Coco3 quite well. There is a problem in that I cannot get it to work in the double-speed (poke 65497,0) mode. This causes a lockup which appears fairly random. I've looked at the BIU read and write functions, but thus far...

Have you seen: https://www.lo-tech.co.uk/wiki/Tandy_1400FD

I recently acquired a 1400FD with a bad PS. I was able to bodge a simple one together, but now it does not seem to want to read the floppy. The floppy cable seems to be very similar to a 1000 cable with +5V on several pins of the 34 pin connector, but attaching a known good floppy to a custom...

A ribbon cable would be difficult as the pin pattern on the DIN-96 connection is not excessively uniform. I think laying out a board would be more straightforward. In truth, I was a couple of hours of wire-wrapping for me. I had a couple of minor goofs to resolve, but nothing excessive. As...

I wire-wrapped mine. It's tedious, but for a one-off project it worked fine. The photos are on thingiverse. I had a DIN-96 connector that was wire-wrappable (~12mm long pins), and a ISA connector that I had de-soldered from an old motherboard. Not much else but follow the schematic. --bryan

@Mike1978 , I saw your question on Thingiverse. I have not don't anything but build and use mine. I briefly considered doing a PCB layout, but that's not my forte. A dual-card one would be possible, but I didn't do that to keep the size down. With 2 cards, the strength of the attachment...

I had tried to use the infrared link from the keyboard, but it's modulated at 40kHz and I only had IR modules at 38kHz I believe. I ended up using the wired interface and wrote some (really dumb) code to interface to it that way. The code is on github at...

Hi. I had a similar idea and was able to locate schematics at https://forum.classic-computing.de/forum/index.php?thread/16680-compaq-portable-ii-und-compaq-portable-386-expansion-unit-schaltplan-und-connect/ I created a simple bracket to hold the connectors for a wire-wrapped version here...

I created a simple T-shirt design, available here: https://www.spreadshirt.com/shop/design/fully+vaxenated+since+1977+mens+premium+t-shirt-D6163b4b2dc5b1108ab00c279?sellable=orNvQOAGMzIGRENoxypo-812-7

Hi, Years (20+) ago I was given a TI S1505 system that had no drives, but included the S1505 motherboard, a multidrop card and I think another serial card. I was able to briefly at the time get the firmware to give me some info, but not able to do much else. I _think_ it still works, but the...