【Fujitsu】 FUJITSU K-600Si Series

These were office computers (small business computers used in offices) from Fujitsu. Fujitsu announced the FUJITSU K-600Si Series (4 model groups and 12 models) in October 1990 as the successor of the FACOM K-600 Series. With the advent of the era of strategic use of information systems, Fujitsu added the Si suffix to its model names, and adopted the slogan "SIS begins with K". In the following year the series was expanded to 13 models, with the addition of the top-end FUJITSU K-690Si Model 30 (4 CPUs). This series had the following features:

(1) Performance improved by using state-of-the-art technology

  • Greatly improved CPU processing capacity due to the use of high-density VLSI (CMOS, 80,000 gates)
  • Expansion of system size by providing multiple CPUs (up to a maximum of 4) (Top-end K-690Si Model 30)

(2) Reliability improved by using state-of-the-art technology

  • Support for duplicate disk (mirror disk) capability
  • Support for disk active maintenance capability to enable maintenance of disk devices during system operation
  • Built-in uninterruptible power supply mechanism for protecting the system from momentary power outages due to events like lightning

(3) Higher capacity files and enhanced RDB

  • Maximum disk capacity was expanded by using a new high-speed disk (K-690 20GB -> K-690Si 68GB)
  • Improved search processing performance of RDB search tool
FUJITSU K-600Si Series Main Specifications
Model name K-610Si K-630Si K-650Si K-670Si K-690Si
Announcement date October 1990 (May 1991 for the K-690Si Model 30)
Main memory capacity (MB) 2-4 3-19 3-36 8-128 32-256
Built-in disk capacity 135MB
Max. number of connected workstations 6 28 112 336 896
Max. number of lines 2 8 24 64 88
Features 13 models and 5 model groups, for wide expandability
Field upgrading within model groups (K-650Si, K-670Si, K-690Si)
Tremendous improvement in CPU performance (K-690Si, 80,000gate CMOS LSI, 32KB cache memory, max. of 4 CPUs)
Improved reliability (mirrored disks, disk active maintenance, UPS (Uninterruptible Power Supply))

(Note) The above specifications are from the time of announcement, and may have been changed due to later improvement.