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I've been trying to get a Daystar P33 accelerator (50MHz 68030) working in an SE/30 with one of @Bolle's amazing adapters -- in this case the model from the early 2020, short form factor with Asante ethernet card underneath. The P33 itself is faulty in some odd ways which I'm trying to figure...

I'm working on repairing a non-functioning Macintosh 12" Monochrome Display. The proximate cause seems to be that resistor RP13 is missing -- completely gone, nowhere to be found, nothing but a blackened set of pads left behind. The underlying fault appears to be that DP5 has shorted, but...

I recapped the analog board on my 128k last week. Everything is running fine, but I am curious about the voltage adjustment. Since there's only one adjustment that affects all voltages, getting 5V set exactly to 5.00V on this Mac leaves 12V and -12V at 12.3V and -12.4V, respectively. The Mac...

I've been collecting 68k Macs on and off for years, but I've never had anything older than a Plus. So when an original Macintosh turned up on eBay within train commuting distance, for a non-exorbitant auction price (< £200), I jumped on it. Here it is:   It came with a keyboard, mouse, and...

Since I guess one compact Mac resolution hacking project isn't enough, I found a relatively easy hack to get extra vertical resolution on the SE/30 with no analog mods at all: As the screen shot shows, this Mac is running with internal video at 512x406 resolution -- 64 more lines than...

Question for the experienced debuggers here: on the SE/30, what are the first things the 68030 does when powered up, and what are the best signals to test to work out early startup problems? A while back I bought an SE/30 logic board (socketed) which had been recapped but was still...

I'm revisiting one of the "classic" goals of compact Mac hacking: changing the resolution of the internal CRT screen. I've been poking at this for a few months, and I've finally got enough progress now that I'm reasonably confident it can be done, so I thought I would share where I've gotten to...

Looks like I have literally burned out the logic board on my IIsi. I powered it up today after a few weeks in storage to test some RAM sticks, and it was behaving strangely: lots of crackling through the speaker with flickering LED, plus some chimes of death, not wanting to stay powered or...

Does anyone have drivers for the Radius display cards for the Plus and SE? I've been working on getting a Radius Two-Page Display card for the SE back up and running from a state where it was hanging the machine. See this TC thread: SE PDS card ROMs Now I'm getting somewhere with the hardware...