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The 'PRX350' indicates it's a 350MHz G3.

There was a minor revision recently to add a breakout address pin to support the use of the larger ROM from the classic, but no - the MacEffects boards are a later revision than the original black and gold ones. I've checked the gerbers and they look fine from there so it must be a manufacturing...

Well, that's one way to decap an IC! My recommendation would be to build a new one from a PIC16F88 - not sure if there's anyone local to you that might have one - @max1zzz might have a DIP one floating around?

The umich link says "Click here to download version 1.01b2 of Choosier."?

I think I saw that someone uploaded this to the Macintosh Garden recently - https://macintoshgarden.org/apps/choosier Also: https://websites.umich.edu/~rsug/choosier/

Well, the RBV is a good place to start testing continuity - after all, if theres an address or data line that's broken then it has no access to RAM which it needs for the display.

Are you using the same SD card in every device, formatted the same way?

The RBV chip used in the IIsi is the same as used in the IIci - I have a pinout for this ASIC, if this helps with your troubleshooting: https://docs.google.com/spreadsheets/d/1NDIA5orTwraRmOUgzrKxWYXcf2AXdULkdwUm020HdXI/edit#gid=731661632

Moved - you'd put it in macintosh ii, not apple ii

Damn - that is a very nice repair - barely notice the crack line!

Uhhh, 3 amps at 30v is NINETY WATTS. What benchtop projects need THAT much power?

...You bought that because it looks like a classic mac, right?

Paging @eric - aren't you after one of these?

Hi James - Just adding my 2 cents here. I must say that although I too feel frustration when I sometimes ask a question and don't get a response, I can understand that there are a number of factors in play here; 1) Macintosh Portables are RARE machines, so the subset of people that have them...

The SND chips are indeed the same on the Iisi, however the Iisi is the first machine that used the EGRET for RTC and ADB instead of discrete chips so there is no RTC for you to salvage off that board, unfortunately.

In the 3D Printing section, there's this thread, which may help: https://tinkerdifferent.com/threads/platinum-pla-for-macs-and-apple-s.561/

€8 for a chip doesnt sound too bad - wait til someone like rochester gets hold of it - it'll be something like $75 each in MoQ of 20.

https://www.techspot.com/news/102684-zilog-discontinuing-z80-microprocessor-after-almost-50-years.html While nothing Apple made uses the Z80 specifically, the Z85C3008VEG PLCC44 and Z85C3008PEG PDIP-40 (aka the 85C30 SCC) used in a lot of 68K Macs, is also being discontinued. If you're...

Oooh - very nice! I'm going to have to get myself a few of these - i've got plenty of USB-C chargers, both Apple and otherwise but magsafe stuff is few and far between.

For most consumer stuff - I agree, that scope is overkill. And a weighty beast. If you're getting it for $50, sure, go for it, but if it's in the $200 range, get yourself a much more modern Rigol scope which ditches the CRT, as @JDW suggests.