Operating Instructions; Introduction; Keyswitch Capabilities - HP Series 37 Reference Manual

OPERA TING INSTRUCTIONS
I~
INTRODUCTION
This section describes how to operate both the Power-on Self Test and the Maintenance Mode Microcode.
The primary function of the Power-on Self Test (PON) is to verify the correct operation of the logic
necessary to load the system.
The maintenance mode microcode contains the code for interpreting maintenance commands and the
Series 37 Self Test. Since the Series 37 does not have a special m:lintenance processor, th" maintenance
microcode resides on the CPU board. The Control
B
detection logic is on the TiC. Only the TIC in slot
I
(channel 1) can have the the Control B logic enabled. To enable the logic, the keyswitch must be in either
the
T
,ocal or Remote position. Note also that only the System Console connected to port 0 (local) or port 7
(remote) can execute the Maintenance Mode commands.
KEYSWITCH CAPABILITIES
The Keyswitch directly effects the function of certain Maintenance Mode commands. These are described
in Table 2-1 Keyswitch Capabilities.
Table
2-1.
Keyswitch Capabilities
Keyswitch
DC
Looping
PON TIC
Position
Enabled Command SLOT I
Allowed
0 NO
N/A N/A N/A
I NORMAL
YES NO YES YES
2 LOCAL (from NORMAL)
YES
YES YES YES
2 LOCAL (from REMOTE)
YES YES NO NO
3 REMOTE YES
I
YES
INO
NO
CONTROL B
Enabled
N/A
NO
YES
YES (Local Console)
YES (Remote Console)
NOV 84
2-1