I guess I should add that one to the list? Adding a SCSI device and forgetting about the pitfalls of SCSI voodoo.
Long story, I was trying to shoehorn in a Z100SI drive, chiefly because I have an external Zip100 drive for my LCII, and because well, my 7500/G300 (read: 7500 with a G3 card in it,
a wolf in a sheep's clothing or rather,
putting the "Power" in "PowerSurge"), as a bridge machine, I felt it would be convenient to have a Zip drive in it so that way I don't have to pull out my external drive and run more cables to the cable salad behind the 7500.
Well, that took an unexpected turn.
Firstly, to try and screw down the drive in the caddy, that was relatively straightforward, then, I had to shoehorn in a Molex to Berg adapter (and there is not much room for maneuvering in the first place), along with the SCSI ribbon, and finally sliding in the caddy, and with how brittle the plastics are on these Outtriger Macs, I smelled a disaster brewing from miles away.
Thankfully, I didn't snap any plastics (yay!), now to turn on the Mac and-- Uh oh...
It would boot to a grey screen, no pointer, followed by me yelling a couple of curses and other choice words that would
probably make a Sailor blush. Can you see it coming? Because at this time, I didn't.
After thinking for a few minutes, and a cursory search on various forums... I thought, "maybe I configured something wrong?", and set off to try and take the drive out again, I know the drive showed signs of life on a Pentium PC (using an Adaptec AHA-2940U2W, the drive indeed was picked up by the boot ROM's device enumeration), so I figured it must work? I had the drive set to ID #2 or #3 (can't remember honestly as it has been quite a while...)
Then I tried to boot the 7500 without the zip drive connected, ran SCSIProbe, I didn't see anything unusual, so I shut the machine down, connected the drive back in, and bam! Grey screen!
At this point, I tried changing the ID jumpers, put the drive back in, fired the 7500 up aaaand, it booted!
That was it... The so-called SCSI voodoo...
Got me good and threw me for a loop. Just a plain ID conflict.
After buttoning back up the 7500 (and fearing the whole time that I'll break something), I just realized, that the drive is pushed in too far, as such, if I ever manage to find a Zip faceplate for the case, it'd have a huge gap between the faceplate and the drive. Oh well, I'll just wait until I can find a faceplate to readjust the drive.
Oh, before I forget, I managed to get 7.6.1 on the PM7500 at long last, but down the line I'll probably try and find the largest capacity SCSI hard drive I can (I have a few 300gb 10K RPM drives but these tend to be space heaters in their own right and need some drastic airflow to keep cool, I do not think this is a good idea to try and run them in the 7500's cramped case!)... I know I should probably go the SCSI2SD route, but I still want to retain the seeking noises of spinning rust (lol). Though had this been a PowerBook, I would've swapped in a SSD, but since it's a desktop machine and is going to stay stationary, I'll just wait until I run out of spares, I'm not in a particular hurry to replace the HDD on this machine.
I probably have another coming up, concerning my iBook G3 and its hard drive (swapping in a bigger SSD, just so I can dual-boot 10.4 and 9.2.2, although I'm still currently working up the courage of dismantling it and swapping the HDD, I took apart a PS3 before and a few iMacs (G3, G4) but they're a walk in the park compared to the iBook 😬