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Diagnostics
Table 5-4
Display
in Octal
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
List of LED Self-Test Display Codes
Definition
Diagnostic/boot ROM not executing. Cleared by ROM code before
transferring control to secondary boot.
If not halt, then CPU test, else CPU error.
If not halt, then MEMORY test, else MEMORY error.
Waiting for XON.
Waiting for console input.
Boot device status error.
Invalid boot block.
DECnet waiting for response from host.
DECnet waiting for message completion.
DECnet processing received message.
If not halt, then MMU test, else MMU error.
Error in first 8KW of memory. Fatal error.
Scope loop.
Extended MEMORY test in progress.
MAP function in progress.
System hung, halt switch on, or not power-up mode 2.
Set by hardware reset.
5.4.3
KDF11-B System Halt
Sometimes the console terminal displays a message in the format:
000100
@
The number (000100, in this example) is the octal address of the next instruction
to be executed. The @ sign indicates that the system has halted and passed control
to the console emulator mode. Use the boot ROM listing for the contents of the
instruction at which the processing stopped. Check the CPU diagnostic LEDs for
additional diagnostic information.
5.5
KDJ11-B AND KDF11-B CONSOLE EMULATOR MODE
The system enters console emulator mode when any of the following occurs:
• The programs execute a halt instruction.
• You press the Halt button on the control panel.
5-10
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