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Early PA-RISC Systems 845, 855 and 860: NS-2 (NMOS)

 Price of about US $200,000 at time of introduction

RAM could be expanded with 16MB memory arrays, i.e., memory boards.

The systems use three main buses, expanding the original 9000/840 architecture: (See Note 4)

 The 64-bit wide System Main Bus (SMB) connects the CPU, main memory and I/O (over CTBs)

with a throughput of 100MB/s.

 Two CTBs/Midbuses (see Central Bus in the TS-1/TTL section) attach via two bus converters to

the SMB

 In turn, the rest of the I/O devices are attached via CIO/CIBs (see Channel I/O above) to the two

CTBs.

 The 850 additionally features two Memory Array Buses (MABs — MAB-0 and MAB-1), capable

of linking up eight 16MB memory modules (arrays) via a 72-bit datapath the the SMB.

Earlier versions of this page listed four models as having a NS-1 CPU; however after careful review the

845 was moved to the NS-2 group of servers.

4.2.3 845, 855 and 860: NS-2 (NMOS)

Later, in 1989, similar computers based on the NS-2, a revamped NS-1, appeared (from early 1989 till

late 1990). The later PA-RISC 1.0 and CIO bus based servers include: (See Note 5)

HP 9000/845 ShoGun:

 27.5MHz NS-2 processor (not completely clear if this system is in fact based on a NS-1 or NS-2

— performance ﬁgures (MIPS) and cache/TLB sizes point to the latter)

 256KB cache

 16384-entry TLB

 CTBs run at 9.16MHz

 Maximum RAM of 112MB (7×16MB), 96MB (6×16MB) with graphics adapter

 Seven shared I/O (CIO) and memory slots

 Performance of about 22 MIPS

 Server version (without graphics) shortly sold as 9000/645SV

HP 9000/855 Jaguar (also HP 9000/855S):

 27.5MHz NS-2 processor

 256KB cache (separate I/D)

 16384-entry TLB

 CTBs run at 9.16MHz

 Maximum RAM of 128MB with one memory controller (MC0) and 256MB with two memory

controllers (MC0, MC1) [it could be that 256MB/two MCs were only supported on the HP 3000

equivalents]

 Performance of about 22 MIPS

 Price of about US $300,000 at time of introduction

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HP B160L Manual do Utilizador Página 139