QuoteRef: compHU_1946

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references c-d
history of computers
data value
history of programming
interface between program modules
consistency testing
what is a computer
resourceful, redundant systems for reliability
software documentation
program listing
flow diagrams and flow charts
quality assurance
function library
coordination system
programming language standards
parallel processing


The staff of the computation laboratory, "A manual of operation for the automatic sequence controlled calculator", The Annals of the Computation Laboratory of Harvard University, 1, Cambridge Massachusetts, USA, Harvard University Press, 1946. Google

2 ;;Quote: in 1642, Pascal designed and built the first mechanical adding machine; for accounting; used rotating wheels that automatically carried to next position
2 ;;Quote: use complementary numbers for subtraction
3 ;;Quote: in 1666, Morland built a mechanical adding machine for multiplication; used repeated addition
3 ;;Quote: in 1694, Leibnitz built a machine for multiplication using a crank to set and turn all wheels simultaneously; his stepped reckoner remains in use
5 ;;Quote: Babbage used Jacquard cards, punched cards read by needles that raised particular warp threads; interlaced with twine in an endless sequence, pegs guided the cards over a cylinder
5 ;;Quote: Babbage separated variable cards for the store, from operational cards for the mill; parameterized solutions to mathematical problems
5 ;;Quote: Babbage's engine would ring a bell for values of a transcendental; if given the wrong card, it would ring a louder bell
11 ;;Quote: the Automatic Sequence Controlled Calculator was five tons and 51 feet long; visualized in 1937 as a panels dedicated to mathematical operations
11 ;;Quote: the Automatic Sequence Controlled Calculator had a multiplying unit, dividing unit, 72 adding registers, 60 constant registers, tables of log x, sine x, and 10^x; like mill and store of Babbage
11 ;;Quote: the sequence control unit reads 24-bit commands (move A to B and start C) from a perforated paper tape
288 ;;Quote: use an independent check of the result to detect incorrect switch settings and incorrect plugging
288 ;;Quote: check for mechanical and electrical failures frequently; no more than 20 minutes without checks
289 ;;Quote: produce a coding sheet and diagram that specify all details of the coding; allocate storage counters to the computation; indicate prints, interpolations, and checks
289 ;;Quote: before running a sequence tape, manually simulate the computation on a degenerate case or initial point; compare intermediate and final results with the actual computation
290 ;;Quote: the operating instructions for a sequence tape include the switches, tapes, card feeds, card punch, typewriters, counters, checks, plugging, and rerun instructions
292 ;;Quote: for sequence tapes in the tape library, the starting tapes should check all switches, plugging, and functional units; otherwise, they just compute the initial values
292 ;;Quote: standardize the preparation of control tapes and operating instructions; group enterprise; minimizes special instructions
292 ;;Quote: evaluate a fourth degree polynomial in 13.8 seconds (46 cycles)
292+;;Quote: can interpose additional computation for a quarter of the cycles; reduces time to 9.9 seconds
336 ;;Quote: since 1943, tabulated complex functions, solved linear equations, statistical analysis, zeros of a function, and partial differential equations

Related Topics up

ThesaHelp: references c-d (337 items)
Topic: history of computers (66 items)
Group: data value   (19 topics, 428 quotes)
Topic: history of programming (91 items)
Topic: interface between program modules (55 items)
Topic: consistency testing (60 items)
Topic: what is a computer (62 items)
Topic: resourceful, redundant systems for reliability (35 items)
Topic: software documentation (64 items)
Topic: program listing (14 items)
Topic: flow diagrams and flow charts (21 items)
Topic: quality assurance (20 items)
Topic: function library (50 items)
Group: coordination system   (8 topics, 214 quotes)
Topic: programming language standards (10 items)
Topic: standards (12 items)
Group: parallel processing   (41 topics, 1116 quotes)

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