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

6-8
Power Requirements
Power Distribution
c Inactive memory banks are those banks on cards in your configuration in addition to
the worst case active memory banks. They must also be added to the calculation.
d Fill in the information in Table 6-3 or Table 6-4.
Figure 6-5 Model 744 Memory Slots
Table 6-3 Model 744/132L Memory Card Current Usage Worksheet
Memory
Card
Size
First
Active
Bank
1
Second
Active
Bank
Third
Active
Bank
Inactive
Banks
Totals
(+5V)
32 MB
2
1.15 A 1.15 A 1.15 A 0.05A x ___ _________
64 MB 2.6 A N/A N/A 0.1 A x ___ _________
128 MB 1.45A N/A N/A 0.07 A x ___ _________
16 MB 1.15 A N/A N/A 0.05A x ___ _________
256 MB 2.90 A N/A N/A 0.14 A x ___ _________
_________
1
Choose the worst case active bank(s) for your calculation.
2
Slot positions and amount of 32MB cards determine the number of active banks.
Table 6-4 Model 744/165L Memory Card Current Usage Worksheet
Memory
Card
Size
First Active
Bank
1
Second
Active
Bank
Third
Active
Bank
Inactive
Banks
Totals
(+12V)
Totals
(+5V)
32 MB
2
0.53 A (+12V) 0.53 A 0.53 A 0.023A x ___ ________
64 MB 1.2 A (+12V) N/A N/A 0.05 A x ___ ________
128 MB 1.45 A (+5V) N/A N/A 0.07 A x ___ ________
16 MB 0.53 A (+12V) N/A N/A 0.023A x ___ ________
256 MB 2.90 A (+5V) N/A N/A 0.14 A ______
________ ________
1
Choose the worst case active bank(s) for your calculation.
2
Slot positions and amount of 32MB cards determine the number of active banks.
Slot 3
Slot 2
Slot 1
Slot 0
Model 744 Board Computer
Memory Slots










