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STARS talk:IBM System/360

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IBMs Rental Life Assumption119:01, 18 August 2011
Importance of Channel to s/360118:04, 18 August 2011

IBMs Rental Life Assumption

I suggest the statement, "the four-year life assumed by IBM," is a gross over simplification of the rental assumptions used by IBM.  As I understand it, there was a RESP committee (Rental Equivalent Sales Price) that determined the expected rental life of each product so that IBM could comply with the 1956 consent decree and that the results of such calculations were generally longer than four years.  My understanding is that the basis of the leasing companies lower rental price for IBM hardware was much more related to a lower imputed interest rate than a longer life assumption, but I am more of an engineer than an economist.  [

PCM hardware rental prices benefited from both lower price to the leasing company as well as lower imputed interest rate.

This of course was the subject of much discussion in the various anti-trust matters and you might want to look for material in some of the works coming out of that matter, e.g. Big Blue, or perhaps you can contact the US government's economist, Alan McAdams for his input.

As it turns out, Big Blue supports the 4 year life and a 5-10 year life used by the risk leasing companies.

Tomgardner19:33, 24 July 2010

Importance of Channel to s/360

May I suggest u expand upon the channel concept as one of the key factors contributing to the success of the S/360.  It is touched on in the market segment, "The most significant market impact of IBM System/360 resulted from its pioneering standard interface."   It was pioneering and deserves more treatment.

You might consider replacing the Storage Products section with a section on the IBM Channel, incorporating the tape and disks as examples.   As you note there really wasn't much new in tape and for that matter the 2311 was just the 1311 warmed over.  The really important disk was the 2314 which, at least according to my IBM friends, was the driving technology leading to all data on line.

Tomgardner19:41, 24 July 2010