Multiprogramming, swapping and program residence priority in the FACOM 230-60

Abstract

FACOM 230-60 is a large size electronic digital computer developed by Fujitsu Limited. The system consists of 1) up to 2 processing units, 2) a 256k word (maximum) high speed core memory that operates at a 0.92 μ sec. cycle time, or at an effective cycle time of 0.15 μ sec. with 16 memory banks and 3) a 768k word (maximum) low speed core memory that operates at a 6.0 μ sec. cycle time, or at an effective cycle time of 1.0 μ sec. with 6 memory banks.