(2) Input commutators: 
(a) A 100 channel simple sequential commutator having a 
variable sampling rate up to 100 samples per second. This commutator 
also should have a switching mode wherein sequential groups of 10 
channels can be selected. 
(b) A multi-channel simultaneous sample hold and multiplex 
commutator having a variable sampling rate up to 12,000 per second. 
(c) A commutator control unit to permit combined or in- 
dependent use of the two commutators. 
(3) Analog to digital converters: 
(a) A 12 bit bipolar A-D converter having a variable sampling 
rate up to 12,000 samples per second. (Small aperture, 50 microsecs). 
(b) A 12 bit bipolar voltage to frequency type A-D converter 
having a variable sampling period in the range of 10 msec to 1 sec. 
(4) A small scale digital computer having the following charac- 
teristics: (1) 12 microsecond add time, (2) 4,096 words of random 
access memory, (3) Two independent serial by word input/output channels 
at least one of which can be used in an automatic buffer mode at a word 
rate of 60 KC, (4) At least one on-line digital magnetic tape unit, 
(5) Punched paper tape input/output at not less than 110 characters per 
second, and (6) An on-line monitoring typewriter. 
(5) A system programming board having the following characteris- 
tics: (1) 500 audio frequency jacks, (2) A removable 1,000 hole plug 
board. 
(6) A 30 by 30 inch combined digital-analog X-Y plotter with 
punched paper tape input. 
(7) Several independent analog displays units to monitor while 
recording. 
(8) 250 inches of standard 19 inch rack for mounting special 
instrumentation. Racks are to be equipped with power outlets and signal 
lines running to system programming board. 
(9) Air conditioning and humidity control. 
Potential Users and Estimated Number of Units Which They May Requires: 
ae U. S. Navy (basic research, applied research, and oceanographic 
survey ships) - 20 to 25 
b. U. S. Coast and Geodetic Survey - 5 to 8 
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