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Seems DosFox, who re-shared the ROMs, is way ahead! I found this awesome thread, I highly recommend checking it out: https://tech.lgbt/@DosFox/114053665154970955 I've seen more than a few references to Unitron boards being Plus clones, including DosFox build, which makes things even stranger...

It's interesting that every single ethernet device seems to hold its MAC in the first bytes. I guess it makes sense, no offsets to calculate, and the other alternative, storing it at the end, would interfere with the DeclROM trailer.

Some more notes from today: At least in PCE it refuses to recognize any HFS disks, meaning only 400k disks actually work (I was wrong before). It's definitely less stable than a real 512K ROM. But it does seem to support up to System 4.0/Finder 5.4 just fine. I tried many old shareware titles...

Ah thanks for the reference! Looks like it might require some source modifications as well, as I'm booting it in PCE as a 512K with 1MB memory (since the ROM looks more like an expanded 512K ROM than a Plus ROM). Roughly, that appears to be enough to get things going if anyone else wants to give...

Turns out I'm wrong. After a LOT more fiddling with PCE I got it to boot Finder 1.1, strange mouse icon and all! Why MiSTer won't boot is a....mystery.

A fair bit of information has been spilled about the Unitron 512, a Brazilian clone of the 512K (here's Low End Mac's take: https://lowendmac.com/2016/unitron-mac-512-a-contraband-mac-512k-from-brazil/). Less, however, has been mentioned about the Unitron 1024. Unlike the 512, which seems like...

I've finally answered part of the mystery about how earlier Rockets worked (and I'll have to update my article). To my surprise, before RocketShare 1.0 and RocketWare 1.5, they didn't load a ROM at all! Despite the sophistication of the Rocket allowing for it to boot (mostly) independently with...

It seems the problem goes back to 1989 even, see this documentation from Central Point for their Option Board: http://ftp.oldskool.org/pub/OptionBoard/(1989)%20Deluxe%20Option%20Board%20v5.4/Package%20Contents/Documentation/OB_Drive_Note.pdf My working drive lives in my period correct Pentium...

Greaseweazel: https://github.com/keirf/greaseweazle/discussions/438#discussioncomment-9560648 HxC: https://torlus.com/floppy/forum/viewtopic.php?p=25793#p25793 This drive is from maybe 2000-2003. I just tried a 1993/1994 drive and it reads properly. Curiously, on the 2000-2003 drive I can...

I've been using my Greaseweazel to read 720k and 1.44mb IBM floppies and Amiga 880k floppies successfully, but 800k Mac floppies seem to be failing. Obviously they're GCR which normally causes problems, but if I understand the docs correctly, the flux image is read at sufficient rate you can...

Today I discovered the DiiMO SpeedDoubler software also supports this functionality: https://web.archive.org/web/20061019184950/https://www.micromac.com/software/sd040.sit.hqx Unclear if this works without the card, I tried it in emulation and it crashes the OS after enabling. I'd recommend...

I discovered something interesting while I was looking at the software for the Magellan 040 from this post: https://68kmla.org/bb/index.php?threads/na-2021-ebay-finds-thread.37524/page-179#post-556420 A fair amount of older software was incompatible with the 040's caches. Traditionally this was...

02E31F; the E masks all have the smaller geometry, which usually runs cooler, all other things being equal. That'll probably run fine at 40, then. But you'll want to let it run for awhile to see if it overheats or if you need active cooling, if you want to keep it at 40 long term.

Probably worth seeing if the signal is strong enough for a CF extension cable to work. One of those could route it to the back panel.

It still might be a D mask. The code is on the chip under the heatsink. At any rate, the E masks will generally run fine at 40 if you’ve got the chunky heatsink on. The 25 rated D masks can get quite hot and may crash, even if they boot.

What mask is the chip? https://eharmon.net/retro/macintosh/motorola-processors/#68040rc

Looking more closely at your pictures, I think you’re right.

Corrosion can cause metal expansion and the solder mask flakes off. It'll also cause broken traces, but generally not shorted traces. Based on the image, measuring between 1, 2, and 4 should all show continuity at 0 Ohms. Between 2 and 3 should show resistance matching the resistor's rating...

That's perfect, thanks! That matches what I measured but I like to double check before I blow up a drive with 12v :D.

It seems my Quadra 700 is missing it's 4-pin cable for HD power. Does anyone know the pinout? From a picture online I think it's (numbered from bottom left viewed from the cable end): 1 - 12v 2 - Ground 3 - Ground 4 - 5v Which helpfully mirrors the pinout of the other end. Can anyone confirm...