HP 9000 200 Series Manual page 16

Order of Devices Searched
by
the Boot ROM
The following table lists the order in which the Boot ROM searches mass storage devices
for system files.
Type of Mass
Priority Storage Device Comments
1 Internal disc drive Select code 4; unit number 0 (right drive)
(9826 and 9836 only)
2 External disc drives Select codes 7 through 31; primary address 0;
unit number 0; volume number 0
3
Shared Resource Manager Select code 21; node number 0;
(SRM)
volume number 8;
/SYSTEMS
directory
4 Bubble memory card Select code 30 (Bubble memory is organized as files and
(HP 98259)
treated the same as other mass storage devices.)
5
EPROM card Unit 0 (EPROM is also organized and treated like other
(HP 98255)
mass storage devices: if a system is found in EPROM,
then it is first transferred to computer memory and
executed from there-the CPU does not execute the
system directly from EPROM)
6
ROM-based operating sys- Execute directly from ROM and do not have to be
terns
loaded into computer memory
7 Internal disc drive
Select code 4; unit number 1 (left drive)
(HP QR?R ~nn HP QR~R
,---
----
----
---
----
only)
8
Remaining external disc Select codes 7 through 31; addresses 0 through 7;
drives unit numbers 0 through 7; volume numbers 0 through 7
9
Remaining SRM systems Select codes 8 through 31
10
Remaining bubble memory Select codes 0 through 31. except 30
cards
11
Remaining EPROM units Units 1 through last one found
1-6
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