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One tip I was thinking about, seems it hasn't been mentioned in this thread, if you stick an ID_EEPROM on the board, that can make using your board easier, especially for folks who want to switch between HATs by plugging them in and unplugging them.  Linux will automagically load the required...

Since you asked... here's my answer.  Fortunately, you can read the ID words of the PIC16CR64, and I believe that should be just enough information to tell you if you can dump the code contents or if code protect is enabled.  If code protect is enabled, you might either get back all zeros on...

Interesting, is plugging in only a mouse not enough to allow a computer to boot?

Now, a big curve-ball question... is it possible for a single board to combine both the functions of RaSCSI and pi-parport?  And, additionally, provide both host and device modes for parallel port communications? https://github.com/worlickwerx/pi-parport Yes, the DB25 connectors on both...

Nice to see that it can come as a kit... solder paste is use it or loose it and this would probably make a good project to use up some of my spare bismuth-tin-silver solder paste.  Especially, the "through hole reflow" technique uses quite a bit of paste.

Okay... Macintosh emulators are weird.  Mini vMac emulates the RTC serial communications by updating on the rising edge of the serial clock, MAME (formerly MESS) emulates by updating on the falling edge of the serial clock.  But they both work okay.  Reading through this carefully, I've made one...

Okay, that's really good stuff to know from reviewing the electrical configuration in the RTC communications circuit.  Now I've removed the pull-ups from the inputs because they are unnecessary, and I've changed the bi-directional data line to use open-drain signaling.  The 1-second pin still...

The Mac Plus schematic does have pull-up resistors on the RTC chip enable, serial clock, and serial data lines.

@buserror I'm using your simavr simulator.  I'm observing the one-second pin clock stretching behavior even when I edit out all the other serial communication logic.  But good call out that I can remove the interrupt disables for port reconfiguration. For now you'll have to look at schematics...

Yeah, I thought about using edge interrupts for the serial clock pin, that would make the code more elegant too (and more similar to Mini vMac).  Now I'm getting around to testing this design under simulation, and I found that the clock divider wasn't actually configured as it claimed to be...

Alright... I've cleaned through the existing source code for the replacement RTC and should have a feature-complete version now, with no fundamental design flaws like the previous versions had.  However, it's not tested yet, so there could be a few bugs.  Anyone interested to code review this or...

Also, looks like there must have been different revisions of the Macintosh SE/30 boxing, some with carrying handle holes. Though it looks like the cause of the de-whitening is simply the fact the bleaching was only on the very surface of the cardboard and easily weathered away by surface...

Ah, interesting.  Looking at that other Macintosh SE/30 box photo, it's making sense now, I thought I saw hints of white coloring when looking at the photo of the Macintosh SE on its box but I wasn't sure if that was really legitimate what I was seeing.  But now taking a second look, I'm seeing...

Good to know about some of the estimated price points for creating molds for the foam blocks.  Related to prototyping options, one I'm seeing is CNC routing to cut away from a solid block of foam.  With enough interest, mold-making could be quite doable. Relating to the SE/30 box, I'd be...

@buserror Nice -- that would help sidestep one issue in testing.  Namely, I say this is only for the sake I am new to AVR/Arduino and I need to figure out what is the problem with the currently written I/O routines using Arduino-specific libraries, otherwise the correct code to program the chip...

Micron Xceed has been cloned, mentioned elsewhere here on the forums.  I think Bolle was the one who created the clone, if I remember correctly.  EDIT: Looks like Bolle did an CPU/cache accelerator clone.  Bur looks like there's other mentions of it out and about.

Well that's a bummer... it is after all just a schematic, you don't need a full conversion to start laying out a PCB, generating a netlist would do the trick for starting out, then it's just a matter of making sure the parts are linked to identifiers in your parts library.  If I understood...

desertrout, those do look to be photos of the SE/30 logic board, the SE logic board is different and its layout is mentioned elsewhere in the discussion thread.  The SE logic board only has two internal layers for power and ground planes.

@Bolle has them, he posted some photos in the Macintosh SE main logic board reverse engineering thread. However, that focused on the internal layers.  Bolle, do you have a full set of the photos at their highest resolution posted somewhere else online?  I'm thinking those would be good to...

The box notes that the ADB mouse is included too, so we'd also need a reproduction of that.  It should be fairly easy to 3D print most of the mechanicals of an ADB mouse and build a simple circuit board for the optical encoders, then it just comes down to programming the microcontroller, but...