Recent content by warmech

Well, fudge - thank you for the heads up!

Huh... Alcon. They're an optics company here in Fort Worth off of I-35W. What on earth is that thing, lol? Surely that couldn't have come from them, could it?

For the adapter BOM, here is the Mouser project for the larger model above. When it comes to a much smaller and slightly more cost-reduced version, here's what I call "the gumstick": I sincerely try to avoid using SMD components, mostly to make sure anyone can assemble what I toss out there...

Welp, this is it - the last major project on my plate to be completed before my wife and I have our first kid in about a month. Born - sorry for the pun - out of my refusal to spend (checks eBay)... a car payment on a second Lisa keyboard, I wanted to make something highly compact that could...

Okay! After getting some readme stuff written up, here be the Lisa hardware repo on my end. Alex's is here, and he's got all the other PCBs. I need to wrap up the RAM cards and get them posted, which I may try to do this weekend over the holiday. The RAM additions will include three separate...

Yep - Alex has my card at the moment and got a chance to bodge power and ground to U5A this weekend. It now boots into LOS successfully! LisaTest does report an issue with the error logic, apparently, but it's not enough to interfere with the system actually operating. Now that we've stomped...

You know what's generally a prudent and conscientious methodology for producing a fairly complicated four layer PCB the size of a dinner plate? MAKING SURE YOUR DAMNED ICs ARE POWERED. That... is an expensive mistake, lol. And possibly the reason why the PCB has been running into issues.

I'm working on testing this at the moment and hope to be done this week or next. Work's just been very demanding, or this would have been done a couple of weeks ago. I guess I should open up Tindie shop or something - I've got more stuff in the pipeline that's starting to approach "finished...

Heh, thanks! I know the PSU replacement isn't the best, but I wanted to at least give it a try to get something working put together as a proof-of-concept. Both of mine are dead beyond repair and I've just been using an ATX PSU hacked into a cut-down JAMMA fingerboard. The soft power circuit is...

Thanks! :) Some have, some have not. Alex, the other person working on this, has uploaded his work so far. He's got some other Lisa stuff on his github as well that's absolutely worth checking out, like a repro of the SCSI card. If it's in one of his repos, it's been tested and verified as...

Very minor update time! Not long after this came in I got it populated and started testing. Ran into some issues initially and started diving into them, but ended up hitting some roadblocks due to a lack of time and tools, as well as a still in-progress understanding of Lisa hardware that just...

So, I've worked on a couple of these, and they have a few failure points/common problems from what I've seen. Couple of questions, though: Does the green LED power on? You hear it energizing - is there neck glow? If it sounds like it's powering up, that's a good sign. Unfortunately, you'll...

Alright, here's what I've got so far; this should be the near final design for V1.0 of the Mega. I'm considering adding an optoisolator, and you'll see why in a sec. I need to do some more breadboard testing now that I have the stepper working, but I'm pleased with how things have progressed so...

Yep - sorry for the confusion. You can either put the SD card where the DB19 would normally go (which makes it easy to get to, but means you can't use it in a daisy chain) or you can put the SD slot inside the case and transplant the DB19 connector from your old HD20 to this and use it in a...

I should be ordering the PCBs for the Mega this weekend to get them tested. They have minimal changes from the original design (they're mostly adapted to the HD20 controller card's form factor is all) so they should just work. Here's the preview which is now slightly out of date - I'll update...