TCP/IP for RT-11

From: Allison J Parent <allisonp_at_world.std.com>
Date: Sun Aug 23 21:55:06 1998

< for ADAC NMR (aka MRI) scanners that run a heavily modified RT-11 V4,
< where the 5.25" 80-track floppies are basically treated as if they
< were double-sided RX02's. (i.e. the geometry only uses 77 tracks,
< and actually skips the first track, just like a real RX02!)

Other than the media will not store the same amount without resorting
to RX33 (or similar) formatting. The RX02 is 512kb on 77 tracks and 26
sectors of 256 bytes. That really doesn't work on 5.25 floppies. So
likely the format is a bit more munged. Anyhow calling something that's
media incompatable a "RX02" sorta makes for great confusion. Hell I
have a solidstate serial disk that emulates a TU58 that uses ram for
storage, it's a TU58 to the software (DD driver) and it's 256k per tape
but it's hardly media compatable. So if someone says RX02 it means 8"
SSDD floppy using DEC M^2FM encoding of the data fields and is able to
read and write RX01 media. Even a DSD880/120 obeyed that!


Allison
Received on Sun Aug 23 1998 - 21:55:06 BST

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