【Fujitsu】 FACOM M-300 Series

The ultra-large general-purpose computers FACOM M-380 and FACOM M-382 (referred to generically as the M-380 model group) were announced in May 1981 as the first models in the FACOM M-300 Series -- successor of Fujitsu's general-purpose FACOM M-100 Series. Later, lower end models in the FACOM M-380 model group were added, and the mid-size FACOM M-310/320 and FACOM M-340 model groups and the large FACOM M-360 model groups were announced, and thus the FACOM M-300 Series lineup was completed (in 1983) as successor of the FACOM M-100 Series. This Series had the following features:

(1)It employed the latest technology to improve the cost performance ratio.
  • The large computers employed a maximum of 1300 or 400 gates per chip, ultra-high speed ECL LSI with a gate delay time of 350ps, and high-density mounting technology (MCCs (Multi-Chip Carriers) enabling high-density mounting of 121 LSI and RAM, and a 50cm deep 3D stack structure for shortening wiring between LSI.)
  • The mid-size computers employed a maximum of 2000 gates per chip, and high-speed, highly integrated TTL LSI with a gate delay time of 1.5ns.
  • The FACOM M-382 achieved performance 3.8-4.5 times that of the FACOM M-200 by using innovations like a high-speed branch mechanism.
(2)The large computers (FACOM M-360/380) supported 31-bit logical addresses, and expanded the virtual space from the previous 16 megabytes to 2 gigabytes.
(3) Power savings were achieved by employing highly integrated LSI, and with the FACOM M-310 and M-320 it became possible, for the first time, to install a general-purpose computers in the office environment. (Further space saving was achieved with the enhanced models FACOM M-310E, M-320E and M-330E).
(4) Component count was reduced by using highly integrated LSI, and reliability was improved with more comprehensive RAS capability.
(5) Easier field upgrading was achieved. (Upgrading to higher-level models within the model group at the installed site)
Specifications of the Large FACOM M-100 Series
M-310, M-320
model group
model group
M-380model group
Announcement date June 1982 February 1983 June 1982 May 1981
size Mid-size Large Ultra-large
CPU Maximum number 1 1 2 2
Main elements 2,000 gates/chip TTL LSI
Delay time 1.5ns/gate
  • 1300, 400 gates/chip ECL LSI, Delay time 350ps/gate (1300 gates is for M-380 only)
  • Access time 5.5ns 4Kbit/module and access time 16ns 16Kbit/module RAM
Buffer storage capacity - -/16/32/60KB 32KB/CPU Local buffer storage 16/32/64KB/CPU
Global buffer
storage 128/256KB
Main memory Memory element 64Kbit/chip MOS-LSI
Maximum memory capacity M-320:6MB
(Max. 12MB with M-340R)
M-360MP: 48MB
Othesrs: 24MB
Maximum number of provided channels 6 8 (6 for M-340R) M-360MP: 24
Other: 12

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

FACOM M-382ECL (emitter-coupled -logic) LSI used by FACOM M-380,Left : 4K-bit RAM module with 5.5ns access time,
Right : logic LSI with up to 1,300 or 400 gates
MCC (Multi-chip-carrier), mounting max.121 LSIs with the size of 31 x 29 cm,14 layers (8 signal layers), shortening signal wire length with diagonal routing (This is on display at IKEDA Toshio Memorial Room in Fujitsu Numazu factory)
3D Stack, which can mount up to 13 MCCs and two side panels having newly developed ZIF (Zero Insertion Force) connectors for connecting signals between MCCsFACOM M-360FACOM M-340