23 May
2011
23 May
'11
2:19 a.m.
Allison wrote:
The preferred controller is the later versions of
RQDX3 as the late
firmware will also
run 3.5" 800k (RX23/22) which uses bacially PC compatable 3.5" media
and it also
supports the RX33 drive at both 400K side and 1.6MB side. Even
without the late
firmware Most dial denity 3.5" drives are supportable at the lower
density of 400K
single sided (same as RX50). For that you that do this will have to
use a PC to
format media or a mVAX2000 or for those that have it X11 diagnostics.
I have an RQDX3 on a PDP-11/73 with dual RX33 drives. The only
capacity I have ever seen is 2400 blocks or 1.2 MB using PC HD
5 1/4" diskettes, probably at 15 sectors per track.
I did notice that for the VERY FIRST TIME, DEC supported the
RX33 to be LLF (Low Level Formatted) directly by RT-11 using
the "FORMAT DU0:" command.
Could you please clarify the capacity of the RX33 drives and how
it is possible to have 400K and 1.6 MB capacities? I know that
your information is almost always correct, so I am wondering what
I am missing? Or have you confused the 5 1/4" RX33 capacity with
the capacity of the 3.5" RX23 and RX22 media?
Jerome Fine