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That's what's known as a hybrid module. Usually a collection of discrete parts, occasionally with some simple logic, on a tiny board, thats then coated with epoxy and turned into a throughhole part. In this instance it could be anything - i cannot find a datasheet for the part.

Ah - that's because the blue version was before i updated the silkscreen - either work, but the MC3488 is NLA and the SN75150 is the modern replacement.

I've found eBay to be a decent supplier of components that are out of stock elsewhere - for things like passive components, there's probably not much difference and half the time is overstock from someone buying off mouser in bulk :)

For the value, yes, that's easy - but getting something that's the correct pinout...that's harder.

If you'd be interested in selling either - i'd be keen to reverse engineer the nubus/pds adapter board.

27.000MHz oscillator - it's the input clock for the Zoran ZR36050 JPEG Encoder chip. There's only two valid input values for the input clock on that chip, 21.000 MHz or 27.000 MHz.

Yes, check the 26LS chips as well - not just the trace continuity but perhaps there's a failure somewhere. Did you check all the GND and VCC connections?

Well people in the US could continue buying from pe-connectors, its just that we need distributors for the international purchasers. Perhaps it might also be worthwhile reaching out to show pe-connectors the market they're impacitng directly...?

Not really - some of us migrated entirely away from other forums when TD came into being :)

You can use the 'test' function in Sprint Layout, and the .lay6 file from the SE Reloaded GitHub here https://github.com/kr239/Macintosh-SE-Reloaded to find out where each pin connects to, and to use as a guide to see if you're missing any connections.

One issue you'll find in the SE is that if the SCC isn't playing nice, System 6 works fine. System 7 borks out as it checks the SCC for proper operation. Check the SCC is working correctly and you don't have any trace damage to any of the pins.

For any of the 100nf axials - ANY should do - i bought from eBay before and had 0 issues. For the electrolytic axials...these ARE admittedly getting harder to find as only really CDE make them.

Well i was using Tom Barber as an intermediary for purchasing the connectors in bulk, and @max1zzz has used PE-Connectors stuff before as well - they're made by them, as far as i can tell - good quality - but perhaps someone like @Branchus and @MacEffects might consider reselling stuff from them...

https://github.com/hegars/1M-30pinsimm That's the place for the SIMM Gerbers. OK - two boards, 4 sockets, £20 + postage seem fair?

IC's all on one side? :)

I do have some of the 30-pin SIMM sockets if you need some - £5 for each and postage would cover it :)

Might be worth offering these to bitsavers who can scan them all in and host them?

I do love seeing people build these boards up - i get the warm fuzzies from seeing machines being saved that would have been trashed! The boards really do look good in red, too.