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Well there's an OTP version of the HC05E1 (68HC705E1DW, in SOIC package it's only available in OTP) that might still be available in a few places, but I don't know for how much, and when they say "pulled from devices" I'm not what they are worth if they are already programmed with something...

Yes that's @max1zzz 's schematics from reversing the board, which just confirms the other ones. Again, while different versions used some GPIOs for different purposes, there is no "scrambling" of the pins with respect to the regular 65HC05E1, it's just that they started manufacturing masked...

The problem with PLCC is size, there are other stuff around the chip… I started documenting the pinouts here. I don't see much of the "scrambled pinout" really, power and oscillator pins are still in the same place for what I've seen…

Pinout for the uC is in the datasheet, page 81. As for the use in macs, only the bomarc schematics seem to have them. Oh dear, I went again down the rabbit (eh, appropriate time) hole of digging the datasheets… It seemed like the 68HC705E6 could have been used as replacement, except the SOIC...

Sadly no, it doesn't have enough pins, only has 2 8bit ports, the original one has 2.5 (2 full 8bit + 1 4bit ports).

I had some look at the EGRET posts here and elsewhere some time ago… It seems there might be interest in recreating them. I don't really have the need myself, my LC-III works fine for now, but I figured I'd spawn a thread to discuss the issue. The various pinouts don't seem documented yet on the...

2AM CEST, might or might not still be awake 🙃

Just received some connectors in the mailbox…

Oh dear, what's this broken piece now? Just when I was about to put it back in the box, this piece fell of the mouse… I'm wondering, does Apple have shares in UHU or something… Oh well, let's clean the ball and rolls as well…

DAMN, I broke the backplate cover when putting it back because I didn't lock the logic board handle back up :-( More UHU Plast… Yeah, should be ok.

Some measurements for later…

Not really sure where to go from there, don't have experience with them.

Didn't have the time for a video but I took some pics of my Performa 5400/180 Black, which was in a box for some years… Also gave me an idea for some future hardware stuff…

I guess we'll have to fake ones with a 2x20 and 2x30… bleh 🤷‍♂️

Aaaand of course Samtec doesn't make the connector I want non-keyed for 2x50 pins… why??? 😭

Oh the bomarc schematics have the full pinout for the 68k connector.

For Marchintosh I dug out this nice black Performa 5400/180 (not DE actually) from the cardboard box it was in the last 10 years or so for a quick checkup… It seems I actually never opened it, and I broke a clip from the backplate cover, and some of the melted bits holding the shield, which...

Not really, even plugging it wrong shouldn't do much damage, I mean even it it shorted the HDD LED output to ground it wouldn't fry the transistor there… You could still check the transistors around (9, 10, 11) for working junctions…

Ah ok so it's the logic board that is failing, not this gear. Or did it work before you tried it?

Are you sure you wired in the correct order? The pins are out-of-order on the schematics, although they also are for J20, so either it's ok or it's all reversed. Does it work without it connected? Did you try just plugging the LED or just the speaker wires separately?