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Summary One of your readers...My memory
From: David Farber <dave () farber net>
Date: Thu, 4 Sep 2008 05:00:50 -0400



Begin forwarded message:

From: Gene Spafford <spaf () cerias purdue edu>
Date: September 4, 2008 1:31:51 AM EDT
To: dave () farber net
Cc: "ip" <ip () v2 listbox com>
Subject: Re: [IP] Re:   One of your readers...My memory

So, to summarize what I got:

There were several one-off fully transistorized computers built by various groups in the mid-1950s.

The first commercial system that was offered for general sale that was completely transistors was the 608, announced by IBM in April of 1955. It had 3000 transistors. In current dollars it was possible to buy a base model for a modest $700,000.

The price for transistors used by IBM in their machines circa 1958 was approximately $2 each (or $20 current), as cited in Thomas Watson's autobiography, Father, Son, & Co., on page 296 (thanks P. Capek and DV Henkel-Wallace).

I wanted to verify a calculation I had used in a magazine article (to come out in October) that in 50 years of semiconductor computing, we've seen almost a nine order of magnitude drop in per-transistor cost in current dollars (although we've also seen an increase in transistors per system use, by a factor of about 6 orders), and about 7 orders of magnitude drop in per-byte cost in secondary memory (about $.10 per byte of drum in 1958). Of course, other costs, including main memory have also dropped in a similar fashion. Total system cost has dropped by a factor of about 500, but capabilities have grown tremendously as well (I don't have a measure of that, but in the millions of times faster, I believe).

This all goes to points I've been making in invited lectures over the last year, but I wanted to reverify my numbers for the print article. (And I am going to let the magazine have priority on the essay, so I won't expand further until October...unless I end up speaking at your institution. :-)


My thanks to everyone who responded. It was fascinating, and I greatly appreciate your willingness to respond!

--spaf




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