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Are you kidding me, lol? That's amazing! I had no idea these cards natively supported the 4MB mod. Hmm... this explains the extra address lines beyond 8. Man, there's a lot on this board that suddenly makes much more sense now - thanks! I assume that pin is otherwise tied to ground through the via?

Time for an update of sorts! Using the scans provided by @compu_85, I've recreated the 2MB card in its entirety with the exception of two traces, and I wanted to solicit input as to how these might be dealt with. First, a couple of items for context: As the board has no discrete traces for...

Welp, that solves the problem I was retooling a new board around! I've been scouring for images of that board and just kinda gave up after a while. I knew I'd seen that rewiring diagram somewhere before, so I started a new PCB last night that just used the added/removed logic to connect to SIMM...

Curses! Actually... give me a few hours. Edit: Oh yeah. It's all coming together. Won't be ready tonight, but I'll probably have an update tomorrow evening. Stay tuned, folks.

Bit of an update. The preliminary draft of the 512K card is done and ready for review. This is the two layer version; I'll be working on the four-layer soon, but wanted to put the two layer board to paper first. I want to sleep on it and look over it one more time in the morning before pushing...

AlexTheCat123

I've been in contact with them about their work so far and I'm beyond impressed. I'm hoping we can collaborate on some Lisa stuff in the near future.

As part of my ongoing efforts to resurrect my Lisa 2, I've stepped back to work on a much broader goal: the reproduction of the Lisa's card stack in full. While the motherboard and I/O board have been reproduced, they are either no longer in production and impossible to find (in the case of the...

Nice! Any chance you'd be willing to share the STLs or models (assuming that's how you've done it)? I'd love to adapt that to EF or MFT; nothing says stupid like slapping a 16mm cine lens on a 640x480 digital camera!

I don't have a reference image handy, but I just acquired a QuickTake 100 that seems to only be taking images in red and green, and even then only slightly red when the color is present. No blue is present in the images whatsoever. Any chance this is a sensor issue, or could this be indicative...

Fixed now - it was related to the bad ground trace for the crowbar circuit. Why those two only and not C20 I have no idea but the issue is fixed now, thankfully. Still stuck in shutdown but not overvolting the hell out of itself, at least.

Minor update - the crowbar circuit has been fixed. A bad trace on a cap was causing it to have no path to ground. One fixed, it was back to the expected chirping of a PSU in shutdown. More to come!

Last message for the day (since I can't edit the previous one): I'm ordering a couple MPU-131s just in case, but rdmark over at TinkerDifferent posted this in the corresponding thread earlier: While I'd rather not spend $30 on a relay, is there some credence to this? The schematics don't...

Chapter 10 of the hardware manual has been an interesting read so far:

Hehehe, I appreciate the pun. And it should be wired correctly - I just built the shop I'm working out of a couple months ago and triple-checked my wiring was up to code before insulation and drywall went up. Edit: Completely unrelated, but this thing has an 800K floppy in it. I wonder if it...

Oh, that's all, lol? :p In all seriousness, thanks for pointing that out (same to you @cheesestraws). My assumption that the on/off switch would have killed that part of the PSU was apparently bad, so thank y'all for clarifying that! I guess that makes me wonder, though - if the PSU was "off"...

Well, I was a dunce and did not have the +5v rail hooked up the the +5v sense line. No improvement after having done so, but it did need to be done. Regarding your other questions, though: - There is one scorched spot, but the components on top of it test fine (see the attached image). The...

Okay, the results are in! I assembled a load tester (pics below) and got the following voltages before the fuse blew again: +5v rail: +8v +12v rail: +18v +33v rail: +53v -5v rail: -5v (one success, at least) -12v rail: -18v +5 standby: +5v (5.5, but, eh) The same two caps puff up after a very...

Yes, watts - my bad on that one. Good point on bumping that up a bit. As for the 12Ohm/15Watt resistor, I'd originally pegged it at 12W, but Mouser only had a 10W or 15W as the nearest values, so I opted for the slightly higher value. I may see if they have a slightly higher value, then. As...

Excellent! And good catch on the -12v rail - exactly why I wanted another set of eyes looking at my work, lol. As for the connector, I bought a collection of card edge connectors off a friend who picked up a ton while they were at a surplus component market in California a few years ago and...