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I had given up on any hopes to get it to work again at that point, so I just removed them to see where the bumper stop was. In all honesty I didn't...

Looks like I have already grabbed that. The 11/04 has been sitting there ever since I got it because I was told it had an intractable PSU issue, but...

I looked at the refresh signals on the address muxes tonight. On the muxes themselves I connected the logic analyzer to the 7 refresh bits, the two...

When I said bad caps I meant presently bad caps not bad caps from back in the day. As in, I have a bad motor on my car. Meaning it’s presently...

Re: soldering iron. Depends on the type and application; 40W is typical. Whatever, get a temperature-controlled unit. You can do a lot of damage...

Tadaaaaa... https://drive.google.com/file/d/13qffSGIGGXKv8S1DMzXXQiwvPw18u3j7/view?usp=sharing J9 is the video header. I followed from the VID...

I've always used serial (RS232) mice on the old systems. Since BBSing was a real thing back then, a serial port(s) was a must.

Yes that sounds like a good option, but I want to run just the video card and composite video monitor with my AIM-65 so as to keep using the AIM's...

Yes you can, but you can't use the MFM combo card which came with the 5170. You would have to replace it with a generic IDE/floppy controller. There...

I think so--if you're not certain, you could try swapping the drive. A thought has occurred to me. At 1.2MB, you're running the drive at 96 tpi,...

So many forums, so little time :( If you do move, please post here that you're doing so. I don't think I actually have an account there; I just...

I ended up going with a 3-button Logitech serial mouse (M-MD15L-9F... looks like a Logitech S9 design) whose FCC ID dates to 8/28/1991. It looks...

Yup, I understand now. Thats the configuration I've been using and its been working fine. My question was more along the lines of "would it be...

Thanks, Chuck. I have to wonder if thats part of the problem here.

Okay, I've got some additional information now. My 5170 is a Model 99, and the A drive is a YD-380 Type 1711, marked 1.2MB.

Already have one, else I'd jump on it.

and one other small note. I have seen lots of posts giving credit for work on TRS/LSDOS OS source code etc. To my knowledge Douglass Beattie was...

Just an update on this thread since it was started March 2020. I had developed a new BIOS/LOWCORE that allows sys1-13 to execute pretty much...

SteveG, If you take the vacuum-formed plastic cover off the keyboard/floppy, I think you will find an 8080 CPU motherboard. The photos I found...

Yeah, I've done SSL on a 25MHz 030 and hoooooooooo boy it is slow.

I am totally with you, man. My thought is that the offload network interface should handle the "hard" stuff, like the actual protocol stack, the...

Another fact of life that's pretty much slam-dunk argument for doing some kind of processor offload is if the goal is to let your Z80/6502/whatever...

As I reading along, I'm remind of multiprocessing on RC2014 bus based on slave Z80 boards communicating to main Z80 processor via dual port RAM. The...

Kyle figured most of it out when he wrote it. I wrote a handler in 1976 and it was a major pain because I didn't have enough of the documentation...

Did it look like this? https://www.youtube.com/watch?v=7J-8jJOBdTc