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- From: smb@ulysses.att.com (Steven Bellovin)
- Subject: Re: CDs cheaper to make than cassettes?
- Message-ID: <1992Nov20.163924.13861@ulysses.att.com>
- Date: Fri, 20 Nov 1992 16:39:24 GMT
- References: <92318.115328MSB101@psuvm.psu.edu> <BxuEKt.LqB@egsner.cirr.com> <1992Nov20.083149.22184@news.columbia.edu>
- Organization: AT&T Bell Laboratories
- Lines: 22
-
- In article <1992Nov20.083149.22184@news.columbia.edu>, lasner@watsun.cc.columbia.edu (Charles Lasner) writes:
- > I understand that IBM 1401's were always containing something like 16K, and
- > the board came with a jumper to make it 8K. When the field service guy left
- > you reenabled the 16K you weren't paying to have maintained (you purchased
- > it to have 8K, but got the 16K board with the disable jumper; the field
- > service contract specified to maintain an 8K machine).
-
- I heard that rumor, too, way back when, but I find it very hard to believe.
- Core memory was *expensive* -- the cores were hand-strung.
-
- > There was a 360/30 option to allegedly have floating point hardware, at
- > extra cost, complete with a switch to "disable" it, but the switch didn't
- > do anything, since all of the delivered machines actually had the FP hardware,
- > even if you neither paid for it, nor paid to have it maintained.
-
- Also dubious. On the 360/30, floating-point ``hardware'' was simply
- extra microcode on capacitive-read punched cards. Maybe, just maybe,
- there was a bit of extra memory for the registers, but I think they
- were part of the scratchpad memory. (The 360/30 had 256 bytes of local
- core storage for registers, etc. This memory was accessible only from
- the microcode, not from assembly language. Source: Bell and Newell's
- ``Computer Structures''.)
-