The Keysight/Agilent/HP 743 is a 6U VME board computer integrating processor, memory, and I/O control onto a single high-performance module. Built on Hewlett-Packard PA-RISC 7100LC architecture with processor options at 64 MHz or 100 MHz, the 743 delivers deterministic computing for demanding data acquisition and real-time control tasks. The board combines on-chip and off-chip caching with flexible RAM configurations scaling from 8 MB to 256 MB, accommodating both general-purpose and time-critical applications within VME systems.
## Technical Specifications
**Processor & Memory**
• PA-RISC 7100LC processor at 64 MHz or 100 MHz clock speeds
• 1 KB on-chip L1 instruction cache
• 256 KB off-chip unified L1 instruction/data cache
• Configurable RAM using 60-ns TSOP-based cards: 8–256 MB depending on VME slot count and stacking configuration
**VMEbus Interface**
• VME Specification Rev. C.1 compliant, 6U form factor
• Supports A16, D16, A24, D32, D08(O) data transfer cycles
• MBLT64 and 2eVME/2eSST support on selected models
**LASI ASIC Integration**
• 8-bit single-ended SCSI-2 bus
• 10 MBit Ethernet (AUI port)
• WD 16C522 compatible parallel interface
• Dual asynchronous RS-232-C serial ports
• 16-bit stereo audio at CD quality
**Power Requirements**
• 5 Vdc ±0.25 V/–0.125 V at <3.5 A
• +12 V ±0.5 V at <0.1 A
• –12 V ±0.5 V at <0.025 A
## Key Features
• Onboard graphics chipset with accelerated I/O on select variants
• Two Mini-DIN PS/2 ports for keyboard/mouse input
• Internal SCSI-2 single-ended bus with external connectivity
• Dual RAM stack architecture supporting primary (up to 3 cards) and secondary (1 card with GSC+ expansion) configurations
• Optional graphics expansion via HP A4267A 8-Plane Color Card or HCRX8/HCRX24 VME boards
## Operating Systems
• HP-UX 9.05 or later
• HP-RT real-time operating system
## Typical Applications
Tactical display and control systems, military workstations including the AN/UYQ-70, real-time data acquisition platforms, and VME-based instrumentation requiring deterministic processing with integrated I/O and graphics.
