This vector (0:0078) is a pointer to a table of diskette parameters that
BIOS the diskette service INT 13H uses for a variety of diskette
operations.

This table includes values such as "head-settle time" and "step rate time"
which have a tremendous effect on the speed of diskette I/O.

It is possible to change some facets of diskette operation by creating a
RAM-resident version of this table and modify selected parameters.  DOS
creates a modified version of this table to improve diskette performance.
Oddly, DOS restores the normal (typically slower) values when it restores
control to the application program.

See Diskette Parameter Table for a layout of the table.

See Also: BIOS Data Area
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INT 1eH: Diskette Parameter Pointer