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I've been waiting for a long time for this to come to fruition and, I have to say, you have absolutely gone above and beyond once again, sir. I just about lost my mind when I saw the repo updated the other day in GitHub, lol. My IIfx can finally live again and that makes me so very happy...

Et voici! Almost everything can be found at Mouser: Mouser Project For the four ICs not available there, there's DigiKey: DigiKey List Unfortunately, there are a few things that either aren't generally available anymore, or I couldn't pin down. In the oscillator circuit, Q1 and Q2 are PN4258...

I didn't originally, but I can take the back off and snap some tomorrow.

I'm actually in the middle of assembling a BOM for someone else, so I'll send it over once complete (and post it to the GitHub page). Some of the ICs aren't going to be as easy to find as going to Mouser or DigiKey; 74ALS1002s can be found on eBay and some places that carry NOS ICs, but they've...

Wow. I actually learned a lot of good information on his site; he wrote a lot of good articles over the years about some of the inner-workings and history of the Mac. I respect his decision to do whatever he wants with his content but, damn, that's disappointing.

@jzmacdaddy is it just a direct connection to the TTL signal off the LB, or does it pass through additional circuitry to shore it up to composite (NTSC, I presume) video requirements?

You bet. I'm wrapping up work for the day, but I'll post some schematics this evening. Long story short, it's stupid simple. The Arduino stepper motor library will drive it through an H-bridge without issue; the only thing you need to know is how many steps per revolution your motor has. The...

Thanks! Hopefully I've got enough time left to wrap up my PSU replacement as well. I tossed out my old design and started a new one, but I doubt I'll have sufficient time to get it knocked out. I may start another thread on that and solicit input on electrical design. PSUs are kind of out of my...

You bet! I'll throw a Mouser project up on here at lunch. I think I'm going to go ahead and make a trimmed down version and post that as well tonight. And yeah, I'd planned on selling the additional PCBs I received (I only have a need for one of these, after all), so those will go up shortly as...

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...

Thank you! Alex and I are pretty darn happy we got to this point. As far as the LOS source code goes, even the PostScript license isn't (to me, at least) terrible; I'm more excited for being able to just review the code and see what insight folks can get out of it. Even if the code itself can't...

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...

Well, it may turn out that the riser cards are unnecessary for what I was making them for. I'll still have a run made for future cases, but I think I've found the issue, and completely by mistake at that. I was reviewing some stuff to get ready to upload to GitHub and noticed something... off...

That all makes complete sense, and I can't believe I didn't catch the resemblance to an NFC antenna. The only main reason I'd inverted the pins was so the PCB could be viewed component side up but, after thinking about it some more, that's really kind of unnecessary. If one needs to work on the...

@stepleton Instead of IDE cables, how do you think these may fair as far as avoiding interference? The CPU riser is pretty simple, but the I/O riser inverts the connector to allow the card to have its component side face up for easier diagnostic access. I know that's a lot of traces to invert...

That's my biggest concern. The card cage extender should be fine; it's just floppy/keyboard/video/power, and those already have ribbon cables or wires comprising the internal harness anyway, so I'm not terribly worried. The bus, though... that's the tricky one. If it doesn't cooperate well...

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...

Boards arrived right as I was heading out of town, so I finally was able to get one assembled today. Still need to get the MCUs programmed and do some testing... but it's otherwise complete! I'll have GitHub links posted here when testing is complete. The SD card slot is a bit of a tight fit...

Thanks! I always keep my eye open for dead ones now that the TashTwenty exists. If I find another one, I'll send you a message! Also, good news - I have a dual-channel opto-isolator separating the interaction between your end of things that handles data and mine that drives the stepper, so...

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...