7 Nov
2008
7 Nov
'08
1:07 p.m.
Of course, that's another pdp-8! I have a DecMate
III which I picked
up at a Radio Rally, but it doesn't have an RX50, so I can't get
it to do anything, apart from display its bios screen.
I assume you realise that an RX50 is just a pair of 80 cylinder single
head floppy drives with a common disk spindle and common head stepper.
The 34 pin interface cable is essentially the standard pinout. The only
trap for the unwary (if I am reading the schematic correctly) is that if
side select is asseted (this would select the other side of a double-head
drive, of course), then the RX50 _disables_ its track 00 output. I think
at least one machine used that feature to detect a real RX50.
-tony