Technical data
Table Of Contents
- Technical Reference Manual for OEMs HP Models 743, 744, and 748
- Contents
- 1 General Information
- Model 743 and Model 744 VME Board Computers
- Product Description
- Supported Configurations
- Model 743 and Model 744 External Devices
- Keyboard and Mouse
- Model 743 and Model 744 Cables
- Model 743 and Model 744 Functional Description
- Model 744 Block Diagram
- CPU Circuit
- Boot ROM Circuit
- Graphics Circuit
- Model 743 Memory Controller Circuit
- Model 744 Memory Controller Circuit
- LED Displays
- I/O Controller ASIC
- VME Controller ASIC
- I/O Expansion
- I/O Expansion Block Diagrams
- Model 748 Ruggedized Workstation
- Model 743 and Model 744 VME Board Computers
- 2 References
- 3 Quality
- 4 Mechanical Information
- 5 Electrical Information
- Video Connector Pinouts
- Audio Connector Pinouts
- HP Parallel Connector Pinouts
- RS-232 Connector Pinouts
- AUI LAN Connector Pinouts
- Single-Ended SCSI Connector Pinouts
- FW SCSI Connector Pinout
- PS/2 Connector Pinouts
- VME Connector Pinouts
- Real-Time Clock (RTC) Battery Information
- Video Output Signal Specifications
- Video Timing Specifications
- 6 Power Requirements
- 7 Product Design Considerations
- Index
6-12
Power Requirements
Power Distribution
Table 6-8 Upper Power Supply Current Budgeting Worksheet
CAUTION: If you upgrade your Model 748 Ruggedized Workstation, adding more: RAM cards, mass
storage devices, GSC, VME, EISA, PCI, or PMC accessory cards, you must recompute the
power budget to ensure the new configuration will be within the available current each power
supply can provide.
NOTE: The PCI tray provides power for option cards from both a +3.3 Vdc source and a +5 Vdc source. Cards
may use either or both power sources, up to 25W per slot. However, the +3.3 V dc source is limited to
39.8 W combined for slots 1 and 2, and 39.8 W combined for slots 3 and 4. For example, if the card in
slot 1 draws 25 W at +3.3 V dc, only 14.8 W at +3.3 V dc is available to a card in slot 2. The limits of
+ 5 Vdc is 25 W per slot.
Location Device
+5V dc
Amps
+12V dc
Amps
-12V dc
Amps
VME Slot 8
VME Slot 7
VME Slot 6
VME Slot 5
VME Slot 4
VME Slot 3 or PMC cards
in Expansion Adapter*
Total Current
Required:
Maximum Available:
34.0A
8.0A
1.5A
* +3.3 current must be entered into.Table 6-5 or Table 6-6