OK, I do have a different, but related question back to Percom drives.
I looked around in other threads and other information (and went through the manuals multiple times) and still having this issue.
I have a "set" of Percom RFD drives (a mother/controller drive unit and the slave drive unit). Both units still have their original full-height 5.25" floppy drive mechanisms in them (both are full height).
RFD40S1 (main mother/controller Percom unit)
RFD40A1 (Percom slave unit)
Generally, I have them working now for the most part, but something is not right. It seems they are functional, but something isn't connected or configured quite right.
I have them set up where the mother/controller drive is drive 1 to the atari, and the slave is drive 2.
I have the terminator chip REMOVED on the mother/controller unit.
I have the terminator chip INSTALLED on the slave unit.
I have the back dip switch block (on the rear portion of the mother unit controller card) set to 4=off, 3=off, 2=on, 1=on (per the manual, this should be DD default for both drive 1 and 2, and also make the controller drive default to drive 1).
I have the jumper chip on the slave unit drive mechanism board set with the proper pins to identify it as location 2.
If I boot up using a 1050 drive for example, and then swap my IO cables to the percoms, everything seems to work pretty well. Meaning that the first Percom drive (mother/controller drive) works when you reference drive 1 and the second Percom unit (slave drive) works when you reference drive 2. Ok, great, that seems to work as it should.
BUT, if I reboot my Atari system with the Percom mother/controller connected to SIO cable as drive one and the slave Percom unit as drive 2 (with a formatted bootable disk in Percom drive 1 of course) thing go bonkers. It boots for a little while and sounds/seems normal, but then after the first pause it does something weird, it starts spinning BOTH Percom drives at the same time and seems like it is trying to read from both of them concurrently. The booting sounds start to sound terrible, and clearly something is not right, and it will just stay in this loop forever with both drives spinning, sounding bad, and grinding every once in a while. It never gets to DOS or READY prompt, and it also never gets an error. It just keeps spinning both drives and trying to read (seemingly both drives concurrently) and keeps sounding bad and grinding, forever.
Does somebody have a working RFD "set" like this (with an RFD40S1 mother/controller unit and RFD40A1 slave unit) that they could check out all the dip switches, terminator chips, and jumpers on both units and tell me what they are set to exactly? I am convinced I still don't have something right with the terminator chip, or the dip switch block on the main controller unit, or the jumper chip on the slave unit, or maybe even the jumper chip on the mother/controller unit mechanism. I don't know. I've tried to follow the manual exactly and other info I've found, but there are still some things that don't seem crystal clear so good chance I still have something wrong.
That would REALLY help if someone could share that info from a known working "set" of Percom RFD drives.