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000141_news@newsmaster….columbia.edu _Sat Oct 18 21:37:39 1997.msg
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Newsgroups: alt.sys.pdp11,vmsnet.pdp-11,comp.protocols.kermit.misc
Subject: Re: DX11 baud rates under RT11
References: <RJM.97Oct15164024@swift.eng.ox.ac.uk> <6232gg$jnu$1@nntp.ucs.ubc.ca> <RJM.97Oct15235003@europa.ox.ac.uk>
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From: wilson@dbit.com (John Wilson)
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Date: 16 Oct 97 15:34:48 GMT
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In article <RJM.97Oct15235003@europa.ox.ac.uk>,
Bob <rjm@europa.ox.ac.uk> wrote:
>Any idea how to interface an 8" drive to a PC? Would I need a Shugart
>type drive? I take it the RX01 type drives are no use in this regard?
>What software would I use under DOS to read RT11 volumes? (I think I
>have it, but I forget it's name).
A Shugart SA8xx compatible drive uses a very similar interface to the
usual SA4xx 3.5"/5.25" interface so you should be able to use one with
a trick cable. Micro Solutions sells such cables for their CompatiCard IV
floppy controller, which also has a working single density mode, which is
unusual in PC FDCs these days. PUTR (ftp.dbit.com/pub/putr/putr.com)
includes support for RT11 (or OS/8) RX01 disks using this setup, I still
haven't got my own 100% working 8" setup so I haven't tested it much
personally but I'm told that it works OK.
Re actual RX01/RX02 drives, these drives have most of their own "brains"
and the interface is nothing like the raw SA4xx interface used by PCs,
however it's a *lot* simpler so it ought to be pretty easy to build a
board for PCs that can use these drives. Some day... Since the PC would
have only the same access that PDP-8/PDP-11 controllers do, there'd *still*
be no way to format fresh disks with these drives though. So the best deal
would be to have one of each, since the SA8xx route wouldn't work with RX02
disks since their format is different from what the PC FDCs can handle,
RX01s are fine though.
John Wilson
D Bit