Present: R. Best, J. D. Crane, R. R. Everett, W. A. Hosier, R. Hughes, W. Ogden, K. H. Olsen, W. N. Papian, H. J. Platt, R. Sims, H. Smead, N. H. Taylor, R. von Buelow.Decisions and progress relevant to the proposed Memory Test Computer (MTC) are summarized for distribution to those interested, and to trace development of the computer

Everett, R. R.

Hosier, W. A.

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Memorandum M-1611 Page 1 Digital Computer Laboratory Massachusetts Institute of Technology Cambridge, Massachusetts SUBJECT: To: From: Date: Abstract: MTC MEETING OF AUGUST 22, 1952 MTC Planning Group R. R. Everett and W. A. Hosier Present: August 22, 1952 Decisions and progress relevant to the proposed Memory Test Computer (MTC) are summarized for distribution to those interested, and to trace development of the com-puter. . R. Best W. Ogden R. Sims J. D. Crane K. H. Olsen H. Smead R. R. Everett W. N. Papian N. H. Taylor W. A. Hosier H. J. Piatt R. von Buelow R. Hughes This meeting was held at the request of K. Olsen to report on circuit work4 which R. Best's group and his own have been doing. He now proposes, for those MTC registers involving series delays propogated from digit to digit (e.g. carries in accumulator and counters, parity check in A-Register), to use only one extra tube per digit, a peaker: I ^r& H. P i a t t explained the modifications he has made on the standard plug-in f l ip-f lop to make i t capable of driving as many as four gate tubes (an estimated capacitive load of 80 mif), delaying .1 (is after receiving a . 1 |JLS pulse before beginning to switch, and completing i t s switching in .3 u-s. Some seven c i rcu i t elements were changed in the f l ip-f lop to obtain th i s performance. APPROVED FOR PUBLIC RELEASE. CASE 06-1104.Memorandum M-1611 Page 2 I t was agreed t h a t fur ther da ta and t e s t s of t h i s c i r c u i t with gate tubes are needed; to a s c e r t a i n how well the switching i s synchronized to pass "on" pulses and r e j e c t "off" pulses} perhaps to bu i ld a counter of i t and see how wel l i t coun t s . Also, fur ther t e s t s are needed to see whether there i s undesi rable feedback from gate tubes to the f l i p - f l o p . I t was poin ted out t h a t product ion changes i n 7AD7's have s t rengthened the g r id s but r e s u l t i n a more remote cut -of f which must be taken in to account i n f l i p - f l o p a p p l i c a t i o n s . Olsen emphasized again the i n t e n t i o n to have near ly a l l d i g i t t ransmission between r e g i s t e r s done as l e v e l s r a t h e r thai p u l s e s , us ing r ead - in ga t e s on ly . Taylor commented t h a t t h i s s i t u a t i o n i s made-to-order for using c r y s t a l ga t e s ; and, hopeful ly , i t w i l l be poss ib le to t r y them out a t a l a t e r s t a g e . Signed M l R. R. Evere t t Signed_ WAH/RRE/jmm V. k. Hosier Q{CL fj«^ APPROVED FOR PUBLIC RELEASE. CASE 06-1104.

MTC Meeting of August 22, 1952

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MTC Meeting of August 22, 1952

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