Gbus$Led0,1,2 - DEC AlphaServer 8200 Technical Manual

GBUS$LED0,1,2

Address FF C100 0000, FF C200 0000, FF C300 0000
Access R/W
The GBUS$LEDn registers are used by diagnostics to indicate test
numbers for both CPUs. LEDs are illuminated by writing a one to
the appropriate bits in one of the GBUS$LEDn registers.
7-78 System Registers
GBUS$LED0 is for CPU0 and drives a 7-segment display.
GBUS$LED1 is for CPU1 and drives a 7-segment display.
GBUS$LED2 is a general purpose display of eight individual
registers.
7 0
BXB-0726-93