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Correct, for the S2SD the drive parameters are stored on the S2SD itself, while the actual drive data is stored on the SD card. I’d probably recommend that you put a suitable SD card in, configure it, and just leave it rather than swapping around. The SD cards also just contain the raw drive...

Great video! You did a great job explaining everything, and I’m impressed how far you got given that you’re new to these old Macs. I’m looking forward to seeing Part 2!

I’ll give that a shot, thanks!

FWIW, the ZuluSCSI is made by the same folks as the SCSI2SD, and as I understand it, it shares the SCSI protocol code base with the S2SD, though it’s more like the BlueSCSI in how the SD card / images are handled. It also has bus transceivers like the S2SD, if that’s important to you. I don’t...

I wasn’t able to find any in stock anywhere, but I wrote up this little guide on building one. Let me know if you have any questions: Post in thread 'Homebrew PRAM Batteries' https://68kmla.org/bb/index.php?threads/homebrew-pram-batteries.21429/post-412446

Glad it’s semi-alive! Yes, definitely get the Duos recapped. As noted, the leaky caps are in the power supply and charging circuit, and bad things can happen if you get shorts in that area… I’d also consider replacing the PRAM battery. I know feelings are mixed on the batteries (and the...

Ahh, good point, I’d forgotten that DC won’t do a full disk copy. Unfortunately, I don’t have any modern machines with SCSI interfaces. Anyone have any suggestions for making a full disk copy on classic Mac OS? Otherwise it might need to wait until I can get a working A/UX install on my Centris.

I have a 3.5” MO disk with a 7.5.3 Japanese installation, as well as some other software. I think it’s either the original install media for my MO drive, or a copy of it, as it includes the B’s Crew formatting software? What’s the best way to create a good image of this disk? When mounted under...

Have you tried the power button on the back, near the dock connector? The one above the keyboard often won’t work if the PRAM battery is dead, but the one on the back should “jump-start” it. Sorry it’s not working, let me know if you’d be interested in selling it as a parts machine.

Welcome! Thanks for the video, it was definitely helpful in understanding the issue, though in the future I’d recommend also posting a text question/description as well, with a video to provide more detail or context as needed. First, the capacitors are definitely going to need to be replaced...

Do you have any of these recovery CDs? It looks like it was a 4 volume set, and while volume 4 is easily found online (Legacy SW), I haven’t found volume 1 (Application SW): Apple Application Software Recovery CD Apple System Software 1 Recovery CD Apple System Software 2 Recovery CD If you...

Based on Inside Macintosh D: Devices, chapter 4, SCSI Manager 4.3 requires system 7.5: “SCSI Manager 4.3 is an enhanced version of the SCSI Manager that provides new features as well as compatibility with the original version. SCSI Manager 4.3 is contained in the ROM of high-performance...

Yep, that’s it! The waveforms will depend on the access pattern, but that should be good enough to make sure they’re getting to the memories, video circuit, etc.

I wouldn’t worry about that (for now, at least). I think most of what you’re seeing is scope persistence and multiple triggers - the patterns on address/data lines won’t be periodic like clock signals. Clock signals will display (mostly) clean on the scope, because they’re constant at the same...

Woohoo, good work!

D5 is a D-flip flop, rather than a logic gate, so it behaves a bit differently. A rising edge on the CLK input causes the value on the D input to be latched and driven on the output Q. The trick is that the value of Q stays the same even if D changes, until there’s another rising edge on the CLK...

Agreed, excellent job @PotatoFi ! I printed one along with a programmer’s switch for my SE last spring and it worked great!

If it’s good at the output of E7 and bad at A11, it’s more than likely a disconnect in the signal somewhere along the way. If E7 is socketed, then the pin of E7 might not be making contact with E7’s socket. I’d measure E7.8 at both the IC pin and at the socket pin where the socket is soldered to...

I’m not sure, but I think it’s likely that’s a press-fit connector. Press-fit connectors use plated PCB holes that are close in diameter to the pins, and the pins have spring “wings” on their sides. During assembly the connectors a literally pressed into the PCB holes, and you can get a strong...