User`s guide

System Initialization and Acceptance Testing (Normal Operation)
4.2 Power-On Self-Tests (POST)
Table 4–1 LED Codes
LED
Value Actions
F Initial state on power-up, no code has executed
E Entered ROM space, some instructions have executed
D Waiting for power to stabilize (POK)
C SSC RAM, SSC registers, and ROM checksum tests
B O-bit memory, interval timer, and virtual mode tests
A FPA tests
9 Backup cache tests
8 NMC, NCA, memory, and I/O interaction tests
7 CQBIC (Q22–bus),SYNC, and ASYNC tests
6 Console and QUART tests
5 SHAC DSSI subsystem and SCSI tests
4 SGEC Ethernet subsystem tests
3 "Console I/O" mode
2 Control passed to VMB
1 Control passed to secondary bootstrap
0 "Program I/O" mode, control passed to operating system
System Initialization and Acceptance Testing (Normal Operation) 4–5