Technical data

1-18
General Information
Model 743 and Model 744 VME Board Computers
RAM Cards When mixing RAM cards of different capacities that include 128 MB and 256
MB cards, the 128 MB and 256 MB cards must be installed into the lowest numbered mem-
ory sites. Memory mapping at turn on determines the size of the card in each location.
LED Displays
Model 743 and 744 VME Board Computers have two LEDs that indicate various system
functions: a system failure LED and a functional LED. See Table 1-11.
Table 1-11 LED Meanings
I/O Controller ASIC
I/O control by the system board’s I/O controller ASIC includes the following interfaces:
•Audio
• AUI LAN
• HP Parallel
• PS/2 Ports 0 and 1
• RS-232 Port A
• Single-Ended SCSI
• Speaker
The battery-backed real-time clock is also implemented in the I/O controller ASIC.
The connectors for the system board's built-in interfaces are on the front panel. Most use
micro-miniature connectors that require special conversion cables in order to use standard
interface cables.
SYSFAIL
(Red)
POWER
(Green)
Meaning Possible Solution
Off Off No Power Check for board seating in
chassis.
On 2Hz Flash Normal Power-on/self-
test
On Off Memory Failure Troubleshoot for failed RAM
card or problem with the
RAM connection.
On 1 Flash/sec. CPU (board) Failure Replace the system board.
On 4 Flash/sec. No console identified Check the console search
path and keyboard connec-
tions. If no problem is found,
replace the system board.
On On OS is booted with
VME services failure
Check the Operating System
VME services. Check that
VME services is configured
in the kernel.
Off On OS is booted with
VME services OK