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Software
The equipment check BIOS call (INT 11H) and memory size BIOS call
(INT 12H) return information from the following data areas:
HEX
Offset
From Segment
Length and
oo4o:oooo
Intended
Use
10H
Devices installed word
13H
Memory installed word
The structure and usage of the diskette driver RAM data area is as fol-
lows:
HEX
Offset
From Segment
Length and
oo4o:oooo
Intended Use
3EH
3FH
40H
41H
42H
1
byte
-
1 byte
-
1 byte
-
1 byte
-
7 bytes
-
drive recalibration status
-
bit
3-0, if 0 then drive 3-0 needs
recalibration before next Seek.
Bit 7 indicates interrupt
occurrence
motor status
-
Bit 3-0 drive
3-0 motor is on/off. Bit 7 -
current operation is write,
requires delay
motor turn off timeout
counter (see Timer ISR)
disk status
-
codes are
defined as in this section
7 bytes of status returned by
the controller during result
phase of operation
54.
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