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
5-37
Electrical Information
Real-Time Clock (RTC) Battery Information
The following section contains information on the real-time clock battery.
Battery Specifications
Table 5-30 summarizes the RTC battery specifications.
WARNING: Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by the manufacturer.
Dispose of used batteries according to the manufacturer’s instructions.
Video Output Signal Specifications
The following input signal specifications are typical for all HP monitors:
• Output connector - 15-pin MDSM
• Impedance - 75 ohms Signal levels -
• Signal levels follow EIA standard RS-343A; white is positive. The composite sync is sup-
plied on the green signal only. Horizontal sync pulses do not need to be supplied during
the vertical sync pulse. However, the 75 Hz VESA-standard timing should use separate
TTL horizontal and vertical syncs. Sync-on-green should not be supplied simultaneously
with the separate syncs.
Video Timing Specifications
This section contains information on video timing specifications. These specifications are not
the output timing specifications for any particular graphics option. They are the input specifi-
cations for Hewlett-Packard monitors.
Table 5-30 RTC Battery Specifications
Type Voltage Manufacturer
Manufacturer
Part No
HP Part No.
Battery
Life
Power Off
Battery
Life
Power
On
Lithium 3 Vdc Panasonic (743)
RAYOVAC
(744)
BR-1616 (743)
BR-1225 (744)
1420-0525 (743)
1420-0541 (744)
.5 Yr (743)
1 Yr (744)
10
Years