HP Vectra Technical Reference Manual page 374

8.2.22 DOS Data Area
The following data areas are used by DOS to provide status information on single-drive systems.
40:105H
1A
8.2.23 Reserved Data Areas
Status of flexible disc for single drive
systems, ie currently drive A: or B:
Reserved
The following areas are reserved and should not be used under any circumstances:
40:089H
02
40:0A1H
07
40:0ACH 2C
40: 101 H 03
40:105H
1A
B.3 EX-BIOS Data Area Map
Figure B.1 shows the EX-BIOS RAI'v1 space which contains the HP_ VECTOLTABLE, the EX-BIOS
memory pool, and the EX-BIOS global data area.
The following notes correspond to the letters in figure B.1 .
a. This address is the segment (CS) value stored in the second word of the HP_ENTRY
interrupt vector 06FH, the HP_VECTOLTABLE is at offset zero. This value may also be
obtained from the V_SYSTEM driver, using function
F
_INS_BASEHPVT.
Memory Map 365