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PA-RISC Chipsets

2.4 PA-RISC Chipsets

2.4.1 Overview

Most HP PA-RISC computers use proprietary chipsets and system designs from HP. In the early 32-bit

times workstations (the “HP 9000/700s” ) and servers ( “HP 9000/800s” ) used different chipsets; later

on, the system platforms of workstations and servers became more similar and used the same chipsets,

albeit sometimes in different conﬁgurations.

The chipsets were tied to a speciﬁc bus architecture but were sometimes used in different generations

of systems.

2.4.2 ASP

Used in

 705, 710, 715, 725, 720, 730, 750

 735, 755 (ASP2/Hardball)

 742i, 745i, 747i

ASP is the chipset used in all older 32-bit PA-RISC workstations with the SGC bus. Still being a

classical chipset, ASP includes several different chips to provide the I/O subsystem and several modules

from third-party vendors.

There are two variants of ASP:

1. “Coral” or “Cobra I/O subsystem,” the original ASP

2. “Hardball” an improved ASP2 variant with fast/wide SCSI and FDDI networking, apparently

used only on the 735/755 workstations

Features (ASP)

 VSC system main bus, 32-bit, to the Viper memory controller

 GSC main I/O bus (this is also sometimes called “SGC” )

 (Viper memory controller — sometimes counted into the ASP chipset and sometimes part of the

CPU)

 NCR 53C700 8-bit Narrow single-ended SCSI-2

 Intel 82596DX 10Mb Ethernet controller

 Intel 82501AD Ethernet transceiver, media auto-selection

 Domain keyboard controller (not implemented on ASP2)

 WD 16C552 parallel

 NS 16550A compatible serial (three ports on ASP, two ports on ASP2)

 512KB EPROM — the Boot ROM

 8KB EEPROM for storing system conﬁguration status etc.

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HP B160L Manual do Utilizador Página 53