HP Vectra Technical Reference Manual page 255

Table 8.3
Diskette Status Table
Offset
3EH
3FH
40H
41H
42H
Length
in Bytes
1
1
1
1
7
Description
Flag byte
Motor status
Motor turn off counter
Status of previous diskette operation
Status bytes returned by the NEe controller from the previous
operation
8.2.4 Hard
Disc
Parameter Table
The optional hard disc drive has a set of parameters which are quite different from the flexible
disc. Therefore, the contents of the hard disc parameter table are not the same as its flexible disc
cou nterpa rt.
Each hard disc volume has its own disc parameter table. Thus, a system with a 20MB hard disc
will have one table, while a system with a 40MB hard disc (configured as two 20MB volumes)
will have two tables. The tables do not have a specific location in memory. Instead, two of the
system interrupt vectors are used as pointers. These vectors must be initialized to point to the
tables by the hard disc BIOS when it is initialized. Interrupt vector 41
H
contains the address of
the first hard disc table while interrupt vector 46H stores the address of the second hard disc
table. The contents of the tables are listed in table 8.4.
246 Disc