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I recently built a small macOS app that might be useful to anyone working with classic Macintosh hardware or custom ROM replacements: ROMSplitter A macOS utility that splits a single .rom file into two files: LOW and HIGH – exactly how many vintage systems (including early Macs) expect them...

We love you all!

Just found this thread... Amazing progress! Very cool project

Would help if we know where you are located;)

For completeness and future reference, I reverse engineered the pinout back to the two microcontrollers on the mouseboard or the Kensington 64210. The MiniDin8 breakout cable pinout is: Pin 1 ADB Data Pin 2 ADB VCC (5V) Pin 3 USB VCC (5V) Pin 4 USB DATA- Pin 5 USB DATA+ Pin 6 GND...

After buying a Kensington 64210 and the lack of an adapter cable I can indeed confirm in having two microcontrollers in the mouse. The breakout cable is just passive. For completeness and future reference, I reverse engineered the pinout back to the two microcontrollers. The Kensington 64210...

In addition to cheesestraws, also check my GitHub for a International BOM & power circuit: https://github.com/daanvdl/Macintosh-Analogboard

Just for archiving purposes, hereby the original datasheets for both Apple RTC IC's: - 343S0042-A (PLCC20) - 343-0042-B (DIP8)

Beside beeping the h*ll out of it between the port(s) and SWIM, it is worth trying to scope out U13C (74AC244) which do buffer these lines: - Head Select (HDSEL) - SWIM Read (SWREAD) - Write Request (W/REQ)

Yes, i also created a VGA variant which is also available in the linked GIT repository.

4N35 is fine.

NE1 and NE2 are NE-2H Neon bulbs. I believe 95VAC/135VDC rated.

Thx. A welcome patch!

@Bolle I noticed a new revision (R5) was being uploaded to your GIT repo. Do you have any changelog available?

It would not surprise me if the TAM is relying on C-Sync only, so i would check if the C-Sync signal is there.

I reverse engineered the GIMO. For those who are interested, you can now build your own: https://github.com/daanvdl/M4099LL-B

Interesting. Sound like this is a easy thing to test by repopulate R207?

Thanks Killvore! I double the 'polarity' checked the 486 (and even changed it with a known good CPU), but still no signs of life:( Will hook some datalines to the scope to see if there is activity when i have a bit more time, but without knowledge on how this thing works it will likely not help...

I know this is a long time ago, but ever found the issue? I have another DOS card: no chime, no POST. - 680LC040 CPU is known to be good - 630 logicboard is known to be good (+ recapped as well) - PSU is known to be good - Cant find any damages or trace issues using my microscope Both 68K and...