Technical data

Functional Description
Power Distribution
2-27
Power Distribution
Power is distributed through the VMEbus chassis’ P1 and P2 connectors to the Model 743
board computers PC boards:
• System board and RAM card power comes through the system board’s P1 and P2
connectors.
• RAM cards get power through the RAM stack 1 and 2 dual connectors.
• Graphics cards get power through the adapter’s (Expansion kit or HCRX graphics
board) P1 and P2 connectors.
NOTE: VME P1 and P2 connectors use two or more pins to carry power or
grounds to the board computer. Check the VME P1 and P2 pinout
tables for exact pin identification for power and grounds.
Table 2-21 lists power requirements. Figure 2-9 shows power distribution.
a. No on-board graphics, RAM, or accessory cards.
Table 2-21 Model 743 Board Computer Power Requirements
Assembly
Model 743/64 Model 743/100
+5 -12 +12 +5 -12 +12
System board
a
6.1A 0.1A 0.1A 7.5A 0.1A 0.1A
RAM Cards 0.2A 0 0 0.2A 0 0
On-board graphics 0.6A 0 0 0.75A 0 0
Graphics card, 8-bit 0.6A 0 0 0.75A 0 0