Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Disk Drive Parameter Table Pointer
 ◄Summary►                                   ◄Up► ◄Contents► ◄Index► ◄Back►
────────────────────────────────────────────────────────────────────────────
 
     The following describes the Diskette Parameter Table format:
 
     Offset     Description
 
     00h        High nibble = step-rate time, low nibble = head-unload
                time
     01h        High nibble = head-load time, low nibble = DMA mode
     02h        Elapse time to turn off diskette motor (37 clock ticks)
     03h        Bytes/sector key (0 = 128, 1 = 256, 2 = 512, 3 = 1,024)
     04h        Number of last sector on track
     05h        Gap size between sectors for read/write
     06h        Data transfer length (0FFh)
     07h        Gap size between sectors for format
     08h        Fill character between formatted sectors (0F6h)
     09h        Head-settle time (milliseconds)
     0Ah        Motor start time (1/8 seconds)
 
     See also: Diskette Data memory
                                    -♦-