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
1-25
General Information
Model 743 and Model 744 VME Board Computers
I/O Expansion
The Model 743 and Model 744 board computers are capable of accepting expansion adapters
allowing greater functionality through expansion I/O cards. The PMC bridge adapter (for
HP-UX systems only) occupies an additional VME slot directly above or adjacent to the
board computer, and has two sites for industry standard +5V signalling PMC cards. The
PMC expansion adapter occupies another VME slot adjacent to or above the PMC bridge
adapter, and provides two additional sites for PMC cards. The GSC expansion adapter has
two sites for GSC expansion cards, and occupies one VME slot adjacent to or above the
board computer. The PMC adapters and the GSC adapter cannot function together.
HP provides three GSC solutions for expanded I/O:
• 8-plane color graphics controller
• FWD SCSI controller
• ATM network controller
Fast, Wide, Differential SCSI (GSC) (HP-UX only) The FWD 16-bit implementation supports
20 MB/sec data transfer rates.
The internal, removable, differential bus terminators allow the card to be located at either end
or between the ends of a SCSI bus. The host SCSI ID for the port is set by the user by way of
the 4-position address selector DIP-type switch.
By default, the FWD SCSI card terminates one end of the SCSI bus by using removable ter-
minator resistors that are on the card. Remove these terminator resistors if the card is in the
middle of the bus.
Table 1-23 summarizes the FWD SCSI interface specifications.
Table 1-23 FWD SCSI Interface Specifications
Connector type SCSI-3, 68-pin high-density thumbscrew
Controller NCR 53C720
Data rate Asynchronous, 10 MB/second
Synchronous, 20 MB/second
Device limits 15 internal and/or external devices
Maximum external cable length 25 meters (82 feet)
Type SCSI-II, 16-bit