IBM System/360 Model 30: Difference between revisions

Revision as of 20:17, 29 October 2021

Revision as of 21:56, 29 October 2021

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==Models==

[[File:IBM System 360 model 30 profile.agr.jpg|thumb|closeup (profile) of 360/30 Console]]

Four models<ref group='NB'>Lower case "M"</ref> of the 360/30 were initially offered.<ref name="mod30-func-char">{{cite book|url=http://www.bitsavers.org/pdf/ibm/360/funcCharfunctional_characteristics/GA24-3231-7_360-30_funcChar.pdf|title=IBM System/360 Model 30 Functional Characteristics|id=GA24-3231-7|date=August 1971}}</ref> They vary by the amount of [[Magnetic-core memory|core memory]] with which the system was offered. The C30, D30, E30 and F30 were respectively configured with 8K, 16K, 32K and 64K of core memory.<ref name="mod30-func-char"/>{{rp|Fig.5,p.9}}

It was little publicized that there were two versions of the Model 30,<ref name="mod30-func-char"/>{{rp|pp.2,8,9}} known (on the rare occasions when they were distinguished at all) as the 30-1 and the 30-2. The original 30-1 had a 2.0 microsecond storage cycle. Later, after the first 1000 30-1 were shipped,<ref name= ibmbook/> it was replaced by the 1.5-microsecond 30-2, although the 30-1 was silently retained in the sales catalog. The two were cosmetically different; the 30-1 looked like other System/360 models, with indicator lamps exposed on the front panel and labeled, but the 30-2 took a retrograde design step, putting the lights behind a stencil, as they had been on pre-360 machines like the [[IBM 1401]].