IBM 6580

ERROR SENSING
The system card and the diskette
adapter supply the error sensing for
the diskette drive. The system soft-
ware maintains a counter in memory to
record read/write errors. If an error
occurs durIng a read/write operation,
the error is counted and another
read/write operation is performed.
The read error s ens ing procedure is
'performed only three additional times.
When a successful read/write operation
occurs before the counter reaches its
limit, a soft error is recorded in the
error log and the diskette operation
proceeds normally. If the system
electronics does not get a successful
read/write operation, a diskette
read/write error prompt will be dis-
played on the display. (Figure 7-21)
is a flow chart showing the error rou-
tines for both read and write
operations.
7-20 IBM Displaywriter Product Support Manual