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000126_news@newsmaster….columbia.edu _Thu Oct 8 21:12:11 1998.msg
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Newsgroups: comp.sys.dec,comp.org.decus,comp.protocols.kermit.misc
Subject: Re: DECMATE & Kermit
References: <6vdcne$shn$1@apakabar.cc.columbia.edu> <slrn71ppp0.1fq.rivie@rivie.daautah.com> <6vj24i$qtf$1@samba.rahul.net> <slrn71q80r.21d.rivie@rivie.daautah.com>
Organization: D Bit, Troy, NY
From: wilson@dbit.com (John Wilson)
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Date: 8 Oct 1998 21:13:35 -0500
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In article <slrn71q80r.21d.rivie@rivie.daautah.com>,
Roger Ivie <rivie@daa-utah.com> wrote:
>WPS also uses
>the floppies in "12-bit mode" (the DECmate is a 12-bit machine), which
>also has implications for the floppy format (basically, only 12 out of
>every 16 bits is valid, but I don't know how they're distributed
>throughout the diskette).
The DECmate word is the low 12 bits of each 16-bit word (in PDP-11 byte order),
so you waste half of every other byte. Not like the RX01/02 formats, where
the bits are concatenated, so you waste the last 1/4 of each sector (being
consistant would be too easy!).
PUTR.COM can take/restore binary images of RX50s but doesn't know the WPS
file system, only OS/278. Doesn't either WPS or OS/278 have a program that
can access floppies from the other OS? If so you could do it in two hops,
assuming you still have a live DECmate. http://www.dbit.com/pub/putr/.
John Wilson
D Bit