Disk drive parts
ethan.dicks at gmail.com
Thu Aug 4 16:55:53 CDT 2005
On Thu, 04 Aug 2005 17:32:39, Joe R. <rigdonj at cfl.rr.com> wrote:
> I have a Diablo 30 and I need cables for it. I've been told that it can
> be used with the PDP-8 but I need to find out which interface it requires.
With the right cable adapters, the Diablo 30 should work with an RK8E.
ISTR the Diablo has a fat-pin square grid-type connector, like an old
fashioned V.35 serial connector, right? The RK05 uses a DEC backplane
block internally, with genuine Unibus cables (RK11D) or a DEC-style
paddle connector and 40-pin ribbon cables (RKV11D, RK8E).
_Electrically_ the Diablo 30 should be the same as a real RK05, but
mechanically, the cables are entirely different.
The drive chain also needs to be terminated. In the case of an RK05,
it's an M930 Unibus terminator in the last drive. Not sure about a
Diablo 30, unless you hang a real M930 off of one of those cable
adapters I mentioned. Of course, if you can find the right connector
for your Diablo 30, you could make a custom terminator - it's just a
bunch of resistors, and I'm sure the schematic is in multiple Unibus
printsets on bitsavers (but I can't really say where to start, except
look at any and all Unibus CPU prints).
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