Max Burnet gave me a pointer from some old price lists, showing that the
RD10 had very similar specs to the RB09. The RC10 manual confirms it -
same BCD addressing of tracks and sectors, same number of tracks, same
sectors per track, same words per sector (32 x 36b for the RD10, 64 x
18b for the RB09). So the "RD10s" on some PDP-9s in the services listing
are actually RB09s, at least at the drive level.
I still don't know what an RC09 is. Alternate name for an RB09?
Half-sized variant? Another mystery is who made the actual drive
mechanism. It precedes DEC's first internally designed fixed head disk,
the RF09/RS09, by two years.
/Bob
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