HP Vectra Technical Reference Manual page 156

Key Combinations
< CTRL> -<Alt> -< Sys req>
<ALT>-nnn
Action
This key sequence provides the user with a method of
generating a hard reset sequence. The key sequence is
communicated to the ROM-BIOS via a non-maskable
interrupt (NMI) to the 80286. This key sequence does
not require the HP-HIL firmware interface to be
operational. The key sequence is used to recover from
exceptional error conditions without power cycling the
system. The EX-BIOS code then:
1) Inspects for the source of the NMI (either I/O
channel check, Memory Parity Error, or as in this
case NMI-RESET).
2) Clears CMOS location 28H, 29H, 2AH, and 2CH to
its default setting.
3) Jumps to location FOOOH:FFFEH.
Where nnn represents a three digit decimal number
entered on the numeric keypad and yields the
associated ASCII characters, i.e., <ALT>-122 yields
the character "z".
5.2.4 STD-BIOS Keyboard Driver (lNT 16H)
The INT 16H driver acts as the interface between applications and the keyboard. This driver has
two sets of functions. One set provides functions to return keycodes and keyboard status. The
other set of functions allows the application to change the translation algorithms of the
scancodes and to vary the repeat rates of the keys on the keyboard. Table 5.6 contains a
summary of this driver's function codes.
Keyboard 147