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I've finally gotten around to trying to make some of my accumulated stuff work. The thing I'm working on now is a bare board from an early 1990s telemarketing dialer. The software has a 1994 date in it, so this would be shortly after the Telephone Consumer Protection Act of 1991 (TCPA). It was...

So far I've only found one source of the Tandy 6000 Xenix Basic, and it uses BCD math. I know that the Macintosh version had both BCD and Binary versions, but unfortunately they were arranged differently enough that I can't just do a side-by-side comparison to find out what is different. Does...

I felt a need to dig around in the attic and see what was in the closest boxes and plastic bins near the door. One had a big bag of salvaged electrolytics and a smaller bag of TO-3s and some of the kind of semiconductors you get out of UPSes. Then I dug into a bin that was out of the way but...

muPro 80 was an 8080-based in-circuit emulator from around 1977 or so. I've found a few references to it from magazines back in the day, but it was mostly "this thing exists", with no attempt to review it or anything. This is another thing I found long ago and only recently got around to...

Has this been properly archived somewhere yet? I couldn't find anywhere in my old floppy disk rips that I had saved a copy, so yesterday I ripped my tape (and found out I have a really good cassette player!) I also was itching for something new to disassemble. I hadn't realized there were minor...

I've been spending a couple of hours trying to find one that matches this. Note the "breadboard" areas on the left side and the front right corner, I was unable to find a picture of a motherboard with those. There's also a silkscreen of "CPU" under the 6502. Most of the chips seem to have '83...

The recent talk about lowercase on a TRS-80 reminded me to finally document something I did back in the day. There were multiple versions of the MCM6670 character generator chip used by Tandy. Some of them had "squashed" lowercase that stayed in the 5x8 matrix. But some of them had descenders...

I found this years ago, and immediately understood what it was. Understanding it only made it stranger. It's an in-circuit emulator for FIVE TYPES OF CPUS using science fair tier technology. Basically it lets you control all the RAM and I/O without a CPU installed. And now that I've remembered...

I have three of these that I accumulated over the past decade from lucky thrift store finds. I finally got them talking tonight so now I need the software for them. I'd like to have the C source code to the "loadice" utility. Does anyone here have it? FWIW, they are a 256K unit with v5.3a...

Here's another thing I found at a thrift store ~20 years ago. It was found in San Antonio, but who knows whether it had been sent back to SWTPC or what. It looks like someone tried to "repair" it by swapping chips. On a soldered board. A few chips had been socketed, but then apparently the guy...

About 20 years ago I found this at a thrift store. I couldn't get it working beyond somehow glitching a character onto the screen, which was just enough to confirm that at least it had raster. I was a bit disappointed that it was brown rather than what I think of as the "standard" blue. And I...

I have a set of HP equipment that was used for 6809 in-circuit emulator at my place of work back in the late '90s. I ended up with it after my company stopped using it, but never even powered it on. I think it stopped working properly before they gave up on it. (I instead used an Applied...

I am moving back from Austin to San Antonio, and I have eight Model IV and four Model 4P units in various condition that I have no room for. I would like to give them to someone local because I don't want to ship them. They are in Austin, but I can bring them down to San Antonio. If I don't...

I have an Intergraph InterPro 125 taking up space in the garage and I want someone to come take it away. It's a Clipper CPU Unix workstation with an 80MB (?) SCSI hard drive in a cube about 15 inches on a side, an enormous CRT monitor (21 inch?), two keyboards (I found the second later at a...

I found this boat anchor years ago at a thrift store and got it because I knew it didn't deserve to be junked. But I never powered it up, or even had the guts to try until today. I just now tried it and got some kind of monitor program at 9600-8N1, but I can't even figure out how to dump memory...