RX50s are 80 tracks, single sided, double density. They will work only
reliably with 360K floppies, preferably ones without a hub ring.
The easiest way to get the 400K images on floppies is to use the PUTR 
program on a DOS PC with a 1.2MB drive. It can write the images to a 
360K disk, switching the 1.2mb drive in the correct setting.
ftp://ftp.dbit.com/pub/putr/

Kees

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Kees Stravers - Geldrop, The Netherlands - pb0aia at amsat dot org
Sysadmin and DEC PDP/VAX preservationist - http://vaxarchive.ml.org
Check the new VS3100 page - http://vaxarchive.ml.org/hw/vs3100/

Net-Tamer V 1.08.1 - Registered