12 Jul
2004
12 Jul
'04
6:23 a.m.
Can RK05s that were used on a PDP-8 be used on
a PDP-11?
==
The drives are the same, the packs on PDP-8's are 16
sector instead of 12.
I'll trade you two tested/cleaned 12 sector packs for
every 16 sector one that you have.
12 Jul
12 Jul
3:09 p.m.
Al Kossow wrote:
Can RK05s that
were used on a PDP-8 be used on
a PDP-11?
The drives are the same, the packs on PDP-8's are 16
sector instead of 12.
I'll trade you two tested/cleaned 12 sector packs for
every 16 sector one that you have. 
3:22 p.m.
On Mon, Jul 12, 2004 at 08:09:43PM -0400, Jerome H. Fine wrote:
I guess there is more to an LLF (Low Level Format)
than
I realized. I had thought that a completely blank RK05 media
was able to be FORMATed via an RK05 drive.
It can.
Your answer
seems to STRONGLY suggest that the media must first be
SECTORed correctly.
It's not the media, per se... it's the hub that's clamped to
the platter itself...
RK05 media are hard-sectored. There are slits cut in a part of the
hub that serve the same purpose as holes punched in the media of
hard-sectored floppies... they delineate the start of each of the
sectors, in the case of the RK05, either 12 sectors or 16 sectors,
depending on the word-size of the controller, 16-bits or 12-bits.
Note that the bit density is identical - what changes is how the bits
are aggregated into sectors (12 sectors of (N) 16-bit words or
16 sectors of (N) 12-bit words).
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 13-Jul-2004 00:10 Z
South Pole Station
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Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html
3:28 p.m.
>>
>> I guess there is more to an LLF (Low Level Format) than I
>> realized. I had thought that a completely blank RK05 media
>> was able to be FORMATed via an RK05 drive. Your answer
>> seems to STRONGLY suggest that the media must first be
>> SECTORed correctly.
>>
>> Otherwise, it should be possible to take and RK05 media and
>> do an LLF on the drive using the system on which the media
>> is to be used - and that it would not be a problem if the
>> media originally had an incorrect number of sectors. Based
>> on your answer, the RK05 media must FIRST have the correct
>> number of sectors.
>>
>> Can you please confirm?
>>
It would be VERY interesting if the drive had the capability to change the
number of mechanical "slits" in the hub on the pack.....
7:27 p.m.
I guess there is more to an LLF (Low Level Format)
than
I realized. I had thought that a completely blank RK05 media
was able to be FORMATed via an RK05 drive. Your answer
It can
seems to STRONGLY suggest that the media must first
be
SECTORed correctly.
These packs are _hard_ sectored. There's a ring round the hub with
notches in it -- <n> equally spaced ones for the sector pulses, and an
extra one, halfway bettween 2 of the sector notches, for the index pulse.
It's that ring that's different between the 12 sector (PDP11) and 16
sector (PDP8) packs.
-tony
7349
days inactive
7349
days old
4 comments
5 participants
participants (5)
-
aek＠spies.com -
ard＠p850ug1.demon.co.uk -
dickset＠amanda.spole.gov -
dvcorbin＠optonline.net -
jhfinexgs2＠compsys.to