9 Apr
2012
9 Apr
'12
12:04 p.m.
On Mon, Apr 9, 2012 at 2:03 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I have one. It's very much the same as a normal
RK05J, but without the
door,pack holder. The disk pack is fiotted when the drive is built and
held down by a couple of tension srings. It still ahs only one disk and 2
heads, but has twice as many cylinders as a noraml RK05. The fact that
the back is not normally removed emans that any slight run-out in the
spindle is not important, since the disk will be in the same position for
formatting, writing and reading.
Yep. IIRC, you are also expected to shim the pack in the hub to
minimize runout and/or wobble.
I beleive if you do remvoe the pack for any reason,
you are supposed to
do a low level format when you put it back in.
Yes. I believe that is true as well.
Much of the internals are the smae as the RK05J. The
heads are obviously
different, you can recognise RK05F heds by the DEC convention that the
high density version of somethign is blue (think of RL02 .vs. RL01
packs). The sockets on the end of the head cables are blue on RK05F
heads.
Yep. Different heads.
I assume the positioner graticule is differnet too,
but I've never
investigated that. IIRC the electorncis is the later RK05J stuff, but
with link changes.
I don't think the positioner graticule is different, but there are
jumpers to set on the cards for J vs F if I'm remembering correctly.
If that's so, then the number of ticks/slits is not likely a 1-1 map
of tracks. It must be a higher density that's divided by selectable
factors.
-ethan