
HP 9000/735 & 755
4.8 HP 9000/735 & 755
4.8.1 Overview
Project names:
The 735 and 755 are early-1990s technical and graphical workstations and computing servers. Both
735 (desktop) and 755 (tower) have a very solid and heavy casing and are built with several circuit
boards, seperate for I/O and CPU. These boards, along with EISA cages and the storage subsystem
are built into so-called “sliders” that can be removed separately from the system. They support a large
set of I/O buses, expansion options and drives. The 735 was widely used as a FDDI node in Convex
clusters and one of the fastest RISC workstations running NeXTSTEP.
The 735 is built into a similar case to the HP 9000/720 workstations, and the CPU and I/O boards can
be swapped between them (however only together).
Introduced: 1992 for
prices starting at $37,395 (735/99) and $58,995 (755/99).
4.8.2 Internals
CPU
PA-7100 99MHz with 256/256KB off-chip I/D cache
PA-7150 125MHz with 256/256KB off-chip I/D cache
Chipset
ASP2 chipset, featuring:
– Cutoff ASIC, interfacing with memory (Viper) and I/O buses, provides address decoding,
bus arbitration and interrupts
– Shortstop ASIC, coordinates data communication between the I/O buses and the mainbus
– NCR 53C700 8-bit single-ended SCSI-2
– NCR 53C720 16-bit Fast-Wide high-voltage differential (HVD) SCSI-2
– Intel 82596DX 10Mb Ethernet controller
– AMD Formac Plus Am79C830 FDDI controller
– WD16C552 parallel, plus additional functionality provided through Cutoff, e.g., Scanjet
support
– NS16550A compatible serial
– 512KB EPROM - the Boot ROM
– 8KB EEPROM for storing system configuration status etc.
– Intel 8042 microprocessor controlling:
*
battery backed RTC
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