Read DEC biweekly report - September 16, 1960 text version








Under Bm BXsxcley'~directLcm 1 hoe o~nt;Anuedto change dloplw a p f i fier 35 twiag 4x1 bereme %be @ ~ t % l i w % h e ; Me Zoaaoad t b t d m l i m ~ e . & a h gh o %a* of the -pe-a%p, t milt wa8 axi ~ f f e a t i v e YW tu [email protected] [email protected],.ra4re C - ~ af %bek.;meii% the ph. W w t u d a% Q -La Uvel at m f ~ h h ~ t st*tl&~ is 68*$m5md fa by the feedbeck lam and the we-amp aw*oZa= In o~de32$0 h u x . e m e the gain in tihe w., WB umd Z&[email protected] dJ~db4.b 8 t 8 d 0f W.0. ~buplingbe2;ween tbe fwst (gruund&d grid) ~ n d second ( e & t b d o ioLlow~z)etsrges of the snap. TQ i.ncrea&e gm-qnp ggaia, w e r e ~ i ~ etSlw ctmra&.t;and me& h&@cs B *-ati isstors. A l l g1W roaruf.t;& in oasillatf e m a$ eereain e s t , t i q e a l the pxe-mp ~ o a t m l a *Me then akmqpd the EfStex oiraait &moss the pLatas of k b gpundid g ~ Z dtakd w e ~ eable to slialnate $he ossctllae k b o m m O u r f b d raml%$a% ae%tldng dam t h e of 25 u mc,, M P a a~ l a g as o w o r i @ i m l modal*

The &[email protected] POP all %age @ m a are now in process a a&sZ aS the a p is p w t i d l f r bpilt. m c-ea in the.px-e-wag r e p i p e .a hew B o W so 1 base @pent some tfrtte c m h g three a i the old modela. B b c e 1 rn leavhg today to ga back %a S Q ~ Q O J , 1 a $0n to okgimise the w m k .I haaeQ:dofie -oaa e r a & i s t o r ~areiuaof the m ~ w d & ~ e it , %a B Gurley. m

I b m beetl Eh&~k%ngthe C &ara~.t;s~istida a countm chain fn us* 1 2 0 1 ' ~ !Fh$ pre~kn% 1 ha& its cmrpllmfsnt trmmEurmx gat& ~ 1 B?mit h e buffer a ~ p U f i e ~ sI= ~bangim @ t4re gdie t t h internal w fliy-Plop, a .%pea$imgrovegeat EW be realized i t h e *rwfer a ~ h m w t m i ~ . t i i ~ ~ o ~ ~ l p l ~ "Pw $ u h e eixeuit. I am now ezepe~inf the exrt : [email protected] yitb &ifferm& was ratios on t h 4axmIomera. ~


B n a q 4 ~ 109 m B w ~ kt3e~trat.a~~ baa beea 6 ~ 1 2 s t m ~ $ & m d is -w e 23 m & i n the procasa of being &e-buggetL, X t i s ~ ' e c t c d that %his wZIIbb m&dyf a r quai- c6at~w9.1 e & l * g ~ &~ . g






digits1 equipment corporation

MAY N A R D . M A S S A C H U S E n S




September 16, 1 6 90 Page 4

J. Badiman

Several wiring diagrams for the Memory Exerciser 2202 for TMI have been completed, and five .mounting panels are now being wired in production. All of the logic has been designed except for the timing circuitry, and the block diagrams have been completed. Front panel drawings are complete, and many have been built. The bus driver, Model 1682, has been completely designed and etched wire layout has been completed. The output swing 1s from - . 02 volts to +6.5 volts and will provide a maximum current of 110 ma. The Automatic Core Tester 2102D for <TMI has been completely checked out and is being shipped to California today. We are now using s 5 amp Sola Transformer to pre-regulate the ac input to the Model 749 power supplies. With this pre-regulation the current output of our drivers is flat with an ac input varying fron 95 to 130 volts. Sylvania Electric Company in Pluncy, Pennsylvania, is now interested in purchasing an automatic plane tester and possible a core tester. I am going down to talk to them on Monday. The order for the General Ceramics Core Tester has been postponed until January, 1961, due to G.C. budget requirements. We are about to receive the order from Rese Brown of the Electrodata Division of Burroughs Corp. in California for the Core Evaluator 2104. Price: about $11,000. Delivery time: 60 d&gs(about _ .. *- -- - . ?= .1 <,? . >:, November 1 . 4) . '






. 7 -

E Harwsod .

The RCA 4 Memory was installed and checked out. Due to some E C excessive inhibit noise we had to allow more time before the next read. Tbe machine is now running with a 6,5 usec cycle time. We will cut this back to abaut 5 usec by doing some minor changes in the way we drive the inhibit lines,


We are in the final assembly phase of the computer and hope to start checking this week. The plugs we had been waiting for


dlgrtrl squlpmsnt corporation








DATE Beptakbez 16,gI s 0




us arra still Z e c l r i q


m p k ~ dhis t

~ B I P - ~ IIO we cm o o a m ~ t Chs W e t r 4 few plug-ifls but I hop& t o wl W B ~ . a s

e m s tctge*x. get m s of ot

dll e q a % a l ~ l o Mk wpe OverQUe have bqan made aa*l Wppe8 ~ i ~ a @ Z Q ~h% 2 k ~ t! @Be ~ b b b 5s 0%Q [email protected] [email protected]&!. ~ ~ % @ I a uf11 coat mrs money ( B a l ~ , a g e ! t 40%~).


21692 ($.9T1 transistor in the low ~ g e e 8lins ccm+imetX and %he T l s l C$*95) will be wed. 9!b w l f f i r r tgfeEh a Beta spegiiica$;toa af 20 T151 ia a low voltagp awLtiah with B a Q+ 20 & a a* w ma*

~ ~ ~ a ~ a

is be* disT1692 is a at k ar @ a a* LO na tmd



digital equipment corporation


DEC biweekly report - September 16, 1960

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DEC biweekly report - September 16, 1960