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I was playing with Google Translate on these images earlier too, got a slightly different translation for one of those labels 🤣

Interesting, you're right! It almost seems like it's describing the content of the terminator block that you took apart rather than the SCSI filter. It even mentions thick film resistors on a PCB just like you showed. That's an interesting twist. Now I'm really confused.

Very nice analysis! Thank you for sharing those pictures, it's fascinating to see resistors like that. I could definitely be wrong here, but looking at the pictures you posted and comparing against the II/IIx/IIfx service manual, it kind of looks like you received two parts. I think the part...

I don't think it really matters one way or the other -- but Apple definitely went out of their way in this doc in multiple places to say that they didn't...

Because I'm crazy, I got ahold of an old AMP IC sockets catalog from 1995. I feel like I should scan and archive this whole catalog because it also has cool stuff like part numbers for PGA sockets, but here is the relevant info about 64-pin SIMM sockets. By the way, the sockets are only rated...

This made me curious so I searched through some service guides on Archive.org. In the 1994 July Service Guide Volume 3 which covers the LC III and 475, the screw is known as "Screw, Cover" with a part number of 430-1031. The screw is not mentioned at all in volume 2 which covers the LC and LC...

Very cool!

I agree, Apple's instructions on the Legacy CD are confusing about what should be used on what. "Drive Setup 1.7.3 should be used with all computers running System Software 7.5 or later" is just plain incorrect for them to say. My IIci can't boot from or mount a disk that has that driver at...

Looking at those pictures in more depth, it looks like there were even provisions for two more ROM SIMM sockets for a total of 16 MB of ROM. I find it kind of funny that the processor is an Am29040 and the flash memory for the ROM is Am29F040B. Super close part numbers. At first I was wondering...

Yep! That looks like pretty darn good evidence. I'm kind of shocked they did it this way instead of a single ROM DIMM. Maybe it was in order to fit 8 MB based on common flash sizes available at the time. I wonder if the LaserWriter 8500 is capable of reflashing its own ROM SIMMs in system :)

Ha! Nice sleuthing! That makes perfect sense with the Adobe strings and everything.

Oh that’s strange! I wonder which Mac would have had an 8 MB ROM during development. Maybe there is a ROM disk appended to it or something…

It seems like it wouldn't be too bad to optionally put /WE on pin 3 instead of 13, but optionally putting 12V onto pin 2 would be a bigger challenge. Not relevant for your SIMM which doesn't need VPP, but would be relevant for the Lobos board. It's not something I will have time to do in the...

Ooh, very interesting! Thanks for sharing! I find this fascinating because AM29F040B doesn't require VPP, and also isn't supported by Apple's Flasher app I disassembled. These chips will identify itself as manufacturer ID 0x01 and device ID 0xA4. That combination is nowhere to be found in...

I think you may be onto something! I just redid the test in my 6100 with ZuluSCSI. There was one variable I changed. I used the 08.99 System Recovery 1 ISO, which has Mac OS 8.1. Luckily the 475 also boots from this same CD so I can still do an apples-to-apples comparison. No pun intended...

Nice work! It's exciting to see this all coming together after your original IIci VGA adapter thread. I'm super impressed that you were able to pull this off with a microcontroller instead of more complicated specific hardware. When you mention the built-in programmable logic cells for...

I'm pretty sure an angled version existed. I want to say that back in the day when @olePigeon raided his local surplus parts store for me, there were a few angled ones in there. I must have sold them with programmers though. Looking on Digi-Key you can actually find a few part numbers if you...

Just for completeness, I tested with ZuluSCSI tonight. Kind of a pointless test at this point since it's already been confirmed that the problem happens in MAME. No surprises -- ZuluSCSI is also affected by the Drive Setup 1.7.3 issue. I did find one issue that only seems to affect ZuluSCSI. If...

I still think it might just be a mistake that wasn't caught until now because real hard drives take a while to start up. If I set my SCSI2SD to have a power-on delay of 10 seconds, it boots just fine from the hard drive and no longer prefers the CD-ROM drive, even with the Drive Setup 1.7.3...

Also, how did you add a SCSI CD-ROM with ID 3, @Arbee? For some reason it looks like MAME allows me to add every ID other than 3... Edit: Ahh, I see, it looks like I somehow ended up with ID 3 already being a CD drive by default, nevermind. Edit 2: It looks like rebooting after having already...