Editing Antifeatures

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This was called a "screwdriver upgrade" -- on the IBM mainframes I saw upgraded the DIP switch was flicked in place and the customer was fully aware of the process. It depends upon the charging model as to if this was a anti-feature. For example, most IBM customers leased the mainframe per-MIPS. Upon requiring more MIPS they much preferred a screwdriver upgrade rather than the multi-year planning required for "forklift upgrade", where the entire machine had to be replaced and sometimes the software rebuilt (eg, the new mainframe hardware may have required a move from MVS/XA to MVS/ESA), with extended downtime and significant risk of deployment failure. Usually contracts for IBM-compatible mainframes explicitly requested the range of MIPS for the hardware, a mainframe with a lesser range being penalised as that implied a major upgrade would be required sooner.
This was called a "screwdriver upgrade" -- on the IBM mainframes I saw upgraded the DIP switch was flicked in place and the customer was fully aware of the process. It depends upon the charging model as to if this was a anti-feature. For example, most IBM customers leased the mainframe per-MIPS. Upon requiring more MIPS they much preferred a screwdriver upgrade rather than the multi-year planning required for "forklift upgrade", where the entire machine had to be replaced and sometimes the software rebuilt (eg, the new mainframe hardware may have required a move from MVS/XA to MVS/ESA), with extended downtime and significant risk of deployment failure. Usually contracts for IBM-compatible mainframes explicitly requested the range of MIPS for the hardware, a mainframe with a lesser range being penalised as that implied a major upgrade would be required sooner.


==== Similar to the above ====
There's a terrific amount of konlwdgee in this article!
 
Server came with two sized hard drives 10 MB or 30 MB ( back in early 80's )  As above, an engineer arrived and flicked a switch to allow the server to access the other 20 MB, and yes, the bill was $10,000


==== Modern version ====
==== Modern version ====
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I have a 96 year old neighbour who still remembers when mains water first arrived in our suburb. He said at the time, that the government wouldn't allow people to build water tanks for their houses, because they wanted people to use mains water. Ah the irony...
I have a 96 year old neighbour who still remembers when mains water first arrived in our suburb. He said at the time, that the government wouldn't allow people to build water tanks for their houses, because they wanted people to use mains water. Ah the irony...


=== Lecture Books ===
This makes eevtrhying so completely painless.
Some lecture books have graphs and tables printed on pages which have special colours hard to copy for overhead projector slides. Instead they sell a special "lecture" version for teachers, so they can sell two instead of one book.
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