(C) INTERIM COMPUTER MUSEUM - LICENSED UNDER CC BY-SA 4.0 IBM 4361 HISTORY ________________ The IBM 4361 is a small, low-cost System/370 mainframe com- puter introduced in 1983 and targeted at the educational and small business markets. Codenamed "Anton", after Saint Anton, the 4361 was developed in Boblingen, West Germany, and was manufactured at three locations: IBM Plant #1 (Endicott, NY, USA), Plant #54 (Havant, UK), and Plant #98 (Yazu, Japan). The unit owned by the Interim Computer Museum is an Endicott-produced 4361 model type 5, serial number 01-0157, which IBM claims is capable of 1.4 million instructions per second (MIPS). Model 5 units have 16 KB of CPU cache, sup- port up to 6 I/O channels, and came with a retail price of $200,000 (equivalent to $648,691 in 2025). All 4361 models are air-cooled, use a single 10 MHz processor, and can sup- port a maximum of 12 megabytes of memory. The 4361 was not a high-end machine. For comparison, the top-of-the-line IBM 3081-G introduced the same year is a water-cooled system with a single 38.5 MHz processor, sup- ports up to 32 megabytes of memory and 32 I/O channels, claims a performance of 12.6 MIPS, and cost $3.3 million new ($9,700,974 in 2025). IBM 4361 History 1