I was standing there when the IBM CE finished his upgrade, so I am pretty sure of my source.

Bruce Black wrote:

I remnember Texas Tech getting a speed "upgrade" to there 370/145 back in the 70's. It consisted of the CE removing three loops from the 145's microcode. The price tag for this upgrade? A cool $ 50K!


I remember a story from long ago: Honeywell had a processed that came in single and double speeds, with a price jump. If you had the slower processor and paid to upgrade to the faster, the CE removed a jumper that made the clock run at half-speed! I can't swear this was true, could be one of those urban computer myths


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