IBM System/360 Model 85

Model 85 The IBM System/360 Model 85 was a high end system that was introduced in January, 1968, with many advanced features. It's possible ^[1] that IBM only sold about 30 360/85 systems^[2] because of "a recession in progress."

Models

The four offered models of the 360/85^[3] were: I85 (512K), J85 (1M), K85 (2M) and L85 (4M), configured with 2 2365 Processor Storage units, 4 2365 units, an IBM 2385 Processor Storage unit Model 1 (=2M), or an IBM 2385 Processor Storage unit Model 2 (=4M) respectively. The I85 includes two-way interleaving while the others provide four-way interleaving of memory access.

Advanced/special features

The system console was L-shaped: one leg was the "Main Control Panel, including a CRT, and the other leg included 2 screens: "Microfiche Document Viewer" and "Indicator Viewer."^[3]^: p.8
Memory Cache - depending on the model and the situation, "the effective system storage cycle becomes one-third to one-fourth of the actual main storage cycle."^[3]^: p.5
enhanced floating point - IBM offered extended-precision 128-bit quadruple-precision floating point on the 360/85^[4]

Emulation

The 360/85, with the use of an emulator program and special instructions, permits running 709, 7040, 7044, 7094 and 7094 II programs.

References

^ http://www.quadibloc.com/comp/pan05.htm
^ IBM's 360 and Early 370 Systems by Pugh, Johnson, and Palmer
^ ^a ^b ^c Function Characteristics, IBM 360/85, http://archive.org/details/bitsavers_ibm360funcncCharJun68_3726379
^ and other high-end 360 models; IBM_Floating_Point_Architecture

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[1] ttp://www.quadibloc.com/comp/pan05.htm

[2] IBM's 360 and Early 370 Systems by Pugh, Johnson, and Palmer

[FunChar85-3] Function Characteristics, IBM 360/85, http://archive.org/details/bitsavers_ibm360funcncCharJun68_3726379

[4] ther high-end 360 models; IBM_Floating_Point_Architecture

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