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Interesting info on BlueSCSI and GPIOs directly connected to the SCSI bus. Agreed some external buffering is probably a better option if the GPIO pin is struggling to pull the line low against the SCSI terminations.

I'll need to get my IIci working first, then I'll decide what to do with OrangePC card :)

@jeremywork Thanks for uploading those manuals! It's not exactly my card, but is pretty close!

I picked up a IIci off eBay today found this installed inside. I can see it has it's own CPU and RAM, even an ISA slot for expansion, but what does it boot from? There's no IDE header to be found on the board. Does it require an external hard drive?

It's my understanding that NuBus generally runs slower that the processor bus and there is more of a protocol or handshaking involved, and that's the reason for the reduced bandwidth. Whereas if the FPGA is sitting on a PDS card, it's directly connected to the ADDR/DATA/CTRL lines of the CPU...

Interesting thread. So it sounds like without acceleration in the card itself, nubus is the performance bottleneck. It also sounds like accelerated graphics cards can achiveve good performance despite the nubus interface. So I'm curious what "accelerated" means in this context. Does that mean...

The analog board used on the Classic and Classic II has a boatload of electrolytic caps all over it. Are ALL of them usually replaced during a "recap" operation, or is there a recomended (partial) list of the most notorious caps to focus on?

Installed a new 8V linear regulator U2. This chip supplies +8V that goes ONLY to the DFAC chip. Now sound has returned to my Classic II. Since it doesn't look like I can edit old posts, I want to stress again that the schematic has a mistake. The +8V power does NOT go to EGRET (U10) or the...

Well I'll be darned, the pads ARE still there! It took a ridiculous amount of IPA, flux, and scrubbing with solder wick to get through the crud, but most of the pads have come back shiny. The +8V regulator is chip is toast, but a new part is on the way. BTW the +8V is only used by the D.F.A.C...

Yes, very gently lifted up on that. Just enough to get a swap in there to clean it. It looks like it seats ok with a disk installed. Is the upper head used for writing and the lower for reading?

I pulled the floppy drive on my SE/30 cleaned the heads and lubricated the moving metal bits. Reads floppies OK. When I try to format or write to a floppy it either fails or locks up the machine. Any suggestions where to look? I just recapped the logic board and cleaned it really well in IPA.

In the thread "Fan replacement for a Mac SE/30" user techknight wrote: I'm seeing this behavior on my SE/30. Blurry corners, gets worse when turning the brightness up. Adjusting the focus pot on the analog board can make the center or the corners better, but not both. Also seeing a dark...

Yikes. From the first pic it looks kind of like the evil corrosive battery gunk worked it's way UP the vertical SIMM like it was hell bent on trashing the ROM chips too. That's some next level twilight zone crap right there.

What does EGRET chip do?

I checked and unfortunately the pads are gone. There are eight small craters where the pads where used to be.

The only schematic I found was for the Rev-B logic board. I've got the Rev-A board (with 4 EPROMs). Most of the resistors and capacitors match up though, at least in the areas of the board I'm looking at. Anyway, the +8V rail goes to: U10, MCU/EGRET -- is the micro that handles the ADB...

Just received a Classic II and started to clean the logic board. The Maxell PRAM battery has not yet bombed, but the cap juice has claimed one victim at least. U2 fell off the board with the lightest touch. I found a schematic for the Classic II and concluded that U2 is a linear reg to generate...

Yup agreed, in the first pic that trace was cut deliberately. The blast point is too accurate. Only imperial technicians are so precise.

Yes, I sure dodged a bullet with that Maxell battery! I'm now cleaning up after these leakers. So far I've not seen any corrosion yet, just some gunk.

Nice! If you still have a hard drive in there I recommend replacing it with a Blue SCSI. HUGE upgrade! Wonderfully quiet and speedy!