PRESENT STATUS OF TRANSISTOR DEVELOPMENT 



437 



said to have domonstrated the featsihility of siicli a data transmission 

 system in the sense that a workable (though not yet optimal) system 

 can l)e synthesized from reprodneible transistor-circuit packages wliich 

 have been produced at reasonabl{> yi(>lds and with reasonalile (thouj^h 

 not yet complete) service reliability. I'^urther d(>vel(){)ment woi'k woiild 

 be needed in all phases to make such a system of ))ackages suitable for 

 field use. It is estimated tliat the present laboratory model requires 

 about one-tenth the space and powcM- re([uired to do the same job with 

 present tul)e art. Fig. 29 is a pliotograph of a transistor bit-rc^gister 

 package and Fig. 30 is another i)hot()gi'apli of such packages sliowing 

 lioth sides of tlie \-arious types employed.* Actual final jjackages would 



1. 4 DIGIT REVERSIBLE BINARY COUNTER 



2. 6 DIGIT ANGULAR POSITION ENCODER 



3. 6 DIGIT GRAY -BINARY TRANSLATOR 



4. 5 DIGIT SHIFT REGISTER 



5. 2 WORD SERIAL ADDER 



Fig. 27 — System functions tested. 



Fig. 28 — Development tran.sistor — circuit packages. 



* The Auto-Assembh' Process used in the construction of these packages is a 

 Signal Corps Development. 



