  This directory contains a handler for an S.I.
disk controller (9502). Overlapped seek, i.e.
simultaneous seek on one drive and read or
write on the other is not permitted by
this controller, but the driver is easily
modified to handle overlapped seek if the
controller is upgraded in the future.

  Also included is a new overlapped-seek
RK handler.  Both drivers use common routines
contained in 'disk.c'.
