HP 330 Service Information Manual page 159

The boot selection menu displays all accessible OSses as the Boot ROM locates them. An OS
is selected by typing the one to three character string (a single letter or a 1 to 2-digit number
followed by a single letter) listed in the menu. Note that the character used to enter Attended
Operation Mode is considered part of this string.
As the keys are accepted they appear in the lower right hand corner of the display. An example
menu screen is shown in Figure 4-6.
Copyright 1985,
Hewlett-Packard Company.
All Rights Reserved.
BOOTROM Rev. A2
MC68020 Processor
Bit Mapped Display
Console Keyboard at XX
HP-IB
DMA-CO
HP98644 at 2
HP98642 at 8
HP98626 at 9
HP98625 at 14
HP98629 at 20
HP98629 at 21
8388608 Bytes
: REMOTE , 21, 0, 8
2B SYSTEM_BASIC
:ROM
B B
A A
H H
F F
Z
+
: HP8290X , 706, 0
3B SYSTEM_BAS
:HP7908, 803, 0
lH SYSTEM_HP-UX
: REMOTE , 20, 0, 8
iF SYSTEM_FORTRAN
2F SYSTEM_FORTH
lZ SYSTEM_4TH
lP SYSTEM_PASCAL
lb SYSburp
SEARCHING FOR A SYSTEM (Press RETURN To Pause)
RESET To Power-Up lH
Figure 4-6. Attended Operation Mode Display Example.
A ROM OS is selected by a number-letter entry. If the user knows that a particular choice is
desired, such as "2F" or "31B" , then the user can type that response as the computer powers up
to make a selection. This simple human interface makes it possible to make a selection without
waiting for the display to show what OSses are available.
A state diagram of how the Boot ROM interprets the key sequence for selecting an OS is shown
in Table 4-4.
Boot ROM Functions
143