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I designed a drop-in replacement PCB for the Mac Plus power switch (SW1), intended specifically as a serviceable replacement when the original switch is arcing, intermittent, or physically beyond saving. https://github.com/daanvdl/mac_plus_sw1

I don’t have a IIvx myself; It’s hard to say for sure just from photos, but it looks like there may be a buffer IC involved — though I can’t immediately tell whether it sits between both the internal and external SCSI ports, or just one of them. Have you checked the schematic yet? Given that...

Thanks for the extensive build report! Very nice to see. We have worked on technical solutions and improvements for months, which ultimately resulted in this kit. I am/we are very happy with it! At the moment we are mainly concentrating on an even more improved screen mounting system, although...

16MB feels like 256GB today

I have to wrap up some other projects, but i have a PK3 so i will order a PIC12F1501 to do some testing:)

It sounds like a better replacement for the LM1881, since it only splits off V-SYNC and keeps the H-SYNC composite. I'm willing to test!

Neat desings, Thanks!

First of all: Thank you all for your interest! We are absolutely thrilled with these products. Back then we were able to buy a bunch of these 8.4" POS monitors, and that was our initial basis for the project. The 8.4" size and quality of this LCD is absolutely perfect. We are currently in a...

Thank you Josh! Great little extension to have!

To prevent potential issues like the infamous "TAM Bose Buzz" in the future, I used the following high-quality connectors: Molex 171813-1012 – KK 396 Series, 12-pin, gold-plated male header Molex 171813-0003 – KK 396 Series, 3-pin, gold-plated male header Both are part of the KK 396 family...

Hi everyone, I recently recapped the Bose Amplifier Board (inside the subwoofer) of my Twentieth Anniversary Macintosh (TAM), and I wanted to share the capacitor list in case it helps others working on the same project. I've attached an image showing both the capacitor locations on the PCB and...

Yes, will add this info lateron (Bose board / Powerboard / Logicboard)

Hi everyone, I recently recapped the power supply of my Twentieth Anniversary Macintosh (TAM), and I wanted to share the capacitor list in case it helps others working on the same project. I've attached an image showing both the capacitor locations on the PCB and a complete parts list with...

If there is 5V standby but the power supply doesn't turn on, it may be due to the LM393/2N2222 combination on the PSU, which can get damaged. These components are often part of a control circuit that enables the main output, and they can be blown in a chain reaction if the original TOP200 (or...

Haha, Congrats!

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 when...

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