non portable - a problem with direct access
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From: glen herrmannsfeldt on 4 Aug 2010 20:27 mecej4 <mecej4.nyetspam(a)opferamail.com> wrote: > Nick Maclaren wrote: (snip) >> TTYs came in in the mid-1960s but, as people have said, didn't take >> off as entry devices for a long time, even in the most advanced >> locations. We didn't use them for that at Cambridge until well >> into the 1970s. > I used an Elliot 803 in 1967-68. It had only paper tape for input and a line > printer for output. The OS, compiler, source code and data (if needed), > were fed in one after the other from paper tape, with some console buttons > pressed in between steps. I remember 2741's and WYLBUR back to 1969, though it wasn't until 1972 that I actually wrote programs that way. And CRBE with 2741's even earlier than that. But cards were the primary input medium way longer than one might think that they should have been. Caltech had a room full of keypunches until at least 1980, though the PDP-10 was available for free student accounts. The 370/158 was only available for real money accounts, including many student class projects. Job submission was either from cards or from a file on the PDP-10, cards being the much more popular choice. -- glen
From: robin on 5 Aug 2010 10:31 "glen herrmannsfeldt" <gah(a)ugcs.caltech.edu> wrote in message news:i3cvup$tq4$1(a)speranza.aioe.org... | There have been discussions on the future of optimizing | compilers, including ones that do algorithm optimization. | That is, substitute a faster algorithm for the one given. | (Code bubblesort, compiler compiles quicksort, etc.) A compiler wouldn't know whether bubblesort would be quicker than quicksort for the given application, nor wold it know whether it was important to preserve sequence when keys are equal.
From: robin on 5 Aug 2010 12:41 "Nick Maclaren" <nmm(a)gosset.csi.cam.ac.uk> wrote in message news:i38gtv$v58$1(a)gosset.csi.cam.ac.uk... | In article <4c5767c6$0$34573$c30e37c6(a)exi-reader.telstra.net>, | robin <robin51(a)dodo.com.au> wrote: | >| > | >| >In the IBM S/360 and S/370 Fortran manual the sample programs | >| >are printed as written on a "Fortran Coding Form." | >| | >| And a right damn-fool idea that was, too, especially for those of us | >| who used paper-tape for input! | >| | >| TTYs came in in the mid-1960s | > | >TTYs were being used in 1960 and even earlier. | >There were demonstrations used on remote installations | >back in the 1950s. | | Sigh. Yes, of course I know that. You didn't know that until I corrected you. You were wrong about the date (8 lines above). TTYs were used on computers much earlier than your "mid-1960s" date. | It's not the point. They were | specialist devices until the first time-sharing computers started | to be used for real work, which was in the mid-1960s. You are wrong about that also. Time-sharing is documented as being introduced in 1961. And I have already quoted Liverpool University as having time-sharing (using TTYs) in or before 1962.
From: Terence on 6 Aug 2010 00:53 Attempt 3 to post even signed in.
From: Terence on 6 Aug 2010 00:58
On Aug 6, 2:53 pm, Terence <tbwri...(a)cantv.net> wrote: Attept 5 to give a note: (removed all above this point (notes of Robin, Glen)- Just 5 cents. In 1951 and 1952 I was working in the holidays as apprentice, helping to build a computer to find why tails fell off planes, especially on polar routes. We (the group) jazzed up a teletype to run at 10cps instead of then 6 cps. Other output wera nixie tubes. Later on, at De Havilland on IBMissile control we used the Ferranti Pegasus which had oscilloscope diagnostic output and papertape i/o for the offline teletype. Then at the other IBM company (computers) in '61 the IBM 1620 and a few other electronic computers used paper tape i/o and teletype output. And something like the IBM PC was already in use as a diagnostic device (as was a 10 inch floppy disc). Some things I understand... |