Well, I reconsidered and futzed about with my Plus and various drives and actually got a drive that I had given up for dead to work!
I took the Apple ROM 235, which is a Quantum ProDrive LPS 240, plugged in the 3 termination resistor packs to the drive's board (I think that this is a key), and set the jumpers for EP (parity) and SCSI 4 (so I wouldn't clobber anything in the next step). There is no TP (termination Power jumper) on this drive.
I mounted the drive in an external enclosure, and plugged it into the external bus of an 8600/200 running 9.1. I could see the drive under Apple System Profiler, but it wasn't mounted. I mounted my System 6.0.5 System and Utility Disk Images from my 8600's hard drive to the desktop using Disk Copy. I opened the System disk image, and ran the Apple HD SC Setup application (v. 2.0.1), and initialized and partitioned the drive.
I then took it back to the Plus, leaving the termination just as before (resistor packs on board) and plugged it into the System hard drive (which is a creaky old CMS drive that doesn't play well with others). It booted fine, and the new drive popped up on the desktop, showing 221 mb of space. I shut it down, and added my Syquest 44 to the chain, and I'm now happily copying files from the Syquest to the 235 hard drive as a torture test. And it is working. I haven't tried loading a System on the new drive yet. The Plus is running the same version of 6.0.5 that I used to initialize and aprtition the drive.
The termination resistor pack issue I think is pertinent. The drives I've tried before either didn't have the packs (they're onboard the drive with the TE jumper) or had two resistor packs. There is a common line in each pack, and there are different resistance values between the two and three pack terminators, so this may be significant.
Hope this helps, Stephen
As promised, I went into my workshop today and set up a Mac Plus for initializing a 1 gig hard disk.
I started with a Quantum 40MB disk for test-purposes. Easy. Used the Apple HD/SC Setup.
Then I moved on to an Apple Rommed Quantum 500MB drive. The one from my Performa 6118. No Term Power jumper. But I had a terminator on the external hard disk case.
Drive kept making the Plus reboot. With the terminator on or off the Bus.
I moved on to a Seagate 1 GIG. Term Power jumpers set.
Interestingly, ALL 7 SCSI formatting programs I used were unable to format the drive with a 3:1 interleave. The Mac Plus hasn't enough memory for it to happen. I errored-out all over the map:
Apple HD/SC Micronet SCSI Utility Micronet v7.2 CMS Utilities FWB HD Tool Kit 1.0 FWB Toolkit 1.7.5 Alliance Power Tools
snip 8>
I took out my IIcx. Trying to format/interleave the 1 gig hard disk to 3:1, I was given an error message that the drive would not allow that interleave.
So......it would seem that, unless there's a 1 gig drive out there that allows 3:1, the Plus won't work with 1 gig drives.
Mark? You're not crazy. This may NOT be doable......
Jeff
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