HP Vectra Technical Reference Manual page 385

Table C.7
CMOS_SHUTDOWN_BYTE (CMOS Address OFH)
Bit Value
7-0 0-3
4
5
6-7
8
9
A
B-FF
Definition
Perform power-on reset sequence
INT 19H (reboot)
Flush keyboard and jump indirect via double word 40:67H
Reserved
Used by POST during test of protected mode RAM
Used for INT 15H support (block move)
Jump indirect via double word at 40:67H
(same as values 0-3)
C.5 Diskette Descriptor Byte (CMOS Address 10H)
This byte is initialized by SETUP and indicates what types of flexible disc drives are installed. The
details of this byte are shown in table C.8.
Table C.8
CMOS_FOC_TYPE (CMOS Address 10H)
Bit Value
7-4 0
1
2
3-0 0
1
2
Definition
No drive installed as drive A
360KB drive installed as drive A
1.2MB
drive installed as drive A
No drive installed as drive B
360KB drive installed as drive B
1.2MB drive installed as drive B
376 CMOS Memory Layout and Real-Time Clock