A bit more on the RX03 floppies and why putr probably dies.
The home block for these contains the usual "DECRT11A" and "RT11A"
tags,
as well as the Rad-50 "V3A", cluster size and first directory segment
pointer, but everything else in the block is set to ASCII space (hex
20), including the checksum.
Is this usual for these floppies?
--Chuck