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Hmm... depends on what you want it to do. I'm thinking that you'd probably need to write an interface/setup section in assembler; but then you could just stick code resources written in C up there and call them similar to calling an XCMD.

I don't have a Classic II logic board to test with; so I'm just going by other experience and intuition; but... My experience is that 50 pins of headers; especially in a dual row; are rather stiff - even without any plastic shroud or key. Smaller connectors are seen all the time on PCs with...

OK, lemme roll back one thing: when I first saw the ebay listing, I thought it was from a chinese cloner, who was getting parts and shipping for almost no $$$. Being from a US person who's hand assembling them does change the dynamics somewhat. However, I still think you're paying too much for...

I thought you just needed to install a compatible version of TotalityFreakedOut…

Right now; 100mm square 4 layer board; 10 each; $14.00 at JLCPCB.

$99 with NO chips?!?! Seems rather steep for three connectors soldered to a rather small PCB… How about putting an inexpensive, easy to program (Arduino IDE compatible would be good) USB-capable microcontroller on the board (like a SAMD21 or STM32); and holding /RESET down while writing to the...

Bad contact can also be a cracked solder joint; which can be invisible. Next candidate would be a bad capacitor on the analog board.

I’ll take anything, actually… never know where an insight might come from.

Well… for me, Google has been spitting back lots of information about what SDLC is and how it fits into the overall IBM network architecture, but rather little on how it actually works on the wire. Perhaps your Google profile is more cooperative? If you’ve got any links, either to...

The more I dig into the low-level LocalTalk implementation; the more I realize that it's overly complex, abstracted, and underdocumented (at least now - information may have been lost to time; or Google has just decided that it's not interesting and so isn't going to show it). It's also turning...

The 128k and 512k didn't have any custom chips at all... and I think the Plus didn't either - they were all built from standard off-the-shelf parts. The "special sauce" that made a Mac a Mac was all in the firmware for the PALs and the ROM chips. They didn't start doing custom ASICs until the...

Yes, they do get charged up, but (depending on the capacitor and what it’s being used for) this takes between nanoseconds (for a small ceramic capacitor used as a high-frequency bypass on a single chip’s power leads) to milliseconds (for a typical electrolytic used as a bulk power reserve)...

Right now... not that much. However, the design goals are: Mac Focused. This is actually a RS422 design, not a RS232; and uses the Mac native mini-din 8 serial connection. It's flexible with regard to the cables you have on hand - you can use a crossover cable (such as an ImageWriter II...

LocalTalk connections switch the Mac's SCC into a mode that's not UART compatible; and the esp8266 only has a basic UART interface. In order to do LocalTalk<->WiFi routing; I'd have to add another processor to it to do the LocalTalk to UART translation... at which point I might as well re-build...

OK, so I've been working on a design for a serial<->WiFi board (there's a thread over in The Lounge inquiring about how many people might be interested in such a thing); and as I've now got a preliminary layout; I figured I should start a development thread. At the moment; what I've got on here...

Sounds like the PSU has gone funky. It's possible that it's no longer capable of carrying load; yet when unloaded does come up to voltage (or at least, does on everything except that -12v output). If the main logic board is nonfunctional (or even removed) turning it on should result in the fan...

For shielded plastic (such as a Mac SE) perhaps spray paint the interior of the case first? Possibly with a clear coat can? You’d probably want to test your paint on some other scrap piece of ABS plastic first to be sure the paint adheres well and doesn’t get eaten by the hydrogen peroxide in...

I’d need to look at the schematics and datasheets, and then do a bit of probing with an oscilloscope and possibly logic analyzer; but… it looks more like a pixel clock timing issue?

Time to show that EGRET the great egress…

How do you like the hot plate? I'm considering getting one for my FPGA project (BGAs... ugh...). FWIW, I don't even consider reflowing 1-off (or low volume) QFPs; I just line them up under the microscope, tack a couple of corners, and drag-solder them (with a big "hoof" tip). I wind up with a...