Zenith Z-100 Series, Reference Manual

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Page 9.9
Disk Drives
Function Code 0 — Reset Disk System
This call resets the disk software for each drive in the system. For floppy drives,
interrupt vector 1EH should point to a drive parameter block as defined by Table
9.7.
Table 9.7. Drive Parameter Block
BYTE PARA M ETER
Disk controller mode byte l.
Disk controller mode byte 2.
Number of dock ticks until motor is turned off following disk VO.
Bytes per sector:
00 — 128
01 — 256
10-512
11 —
1024
Last sector of track
Gap length in bytes.
Data length:.
7
80H if 128 bytes per sector
FFH if not
Gap length when formatting.
Fill data used during formatting.
Head settling time (milliseconds).
Motor start time (.25 second increments).
8 9 10
Function Code 1 — Read Disk Status
Returns the status in AL This call is used by an applications program which
requires the disk status generated by the last disk VO operation. The status will
be the same as that returned by the last VO call (function codes 2 thru 5).