Fact_Sheet_17A_SPADATS_CAD_Jan1963 Fact Sheet 17A SPADATS CAD Jan1963

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PHILCD

FACT SHEET
Number 17 A, January 1963

SPADATS CAD
COMPUTER ACCESS DEVICE
A device for linking the Philco 2000
to numerous teletype lines

SPADA TS, the Space Detection and Tracking System, maintains continuously updated
records describing and locating man-made objects in space. Stations around the world
transmit observations over a communications system terminating in a number of
teletype lines at the USAF SPACETRACK Center in Colorado Springs. The information
is processed and stored by a Philco 2000 Electronic Data Processing System. CAD
arranges the data in a format acceptable to the Real-Time System of the Philco 2000.
It also organizes processed data from the Philco 2000 for transmission by teletype
lines to the tracking stations.
The input portion of CAD is called CADI, the output portion CADO. Both can handle
24 teletype line s.
CADI

The input from the tracking stations is punched on paper
tape by Teletype Model 28RT sets at 100 words per minute.
CADI reads these tapes one at a time at 200 words per
minute. The characters are converted from Baudot code to
Philco 2000 code and assembled into 48-bit words for the
Philco 2000. The most significant six bits of the word
identify the teletype lines; the remainder furnish the data.

Input
Programming

The order to read data from CADI is similar to orders for
other Philco 2000 input-output devices. It specifies the number
of words to be transmitted - up to 1024 - and the starting address where the data is to be stored in memory. The order
can specify priority for one of the lines. That line will
then be checked before any of the others. If no priority is
specified, each channel is scanned until data is sensed on a
line. Scanning then stops, and the message is read from the
paper tape.
If the number of words requested by the input order exceeds

the number of words in the message, scanning resumes
and another message is read until the number of words
requested has been forwarded. Scanning and transmission
then cease.

PHILeo

ASUBSIDIARYO'~~Y!?~

COMPUTER DIVISION
WILLOW GROVE, PENNSYLVANIA

CADO

Data to be transmitted from the computer to various teletype
lines is transmitted through CAOO. The data is stored in
memory, one Baudot-code data character and a line identifier
per word. Data for various lines may be intermingled; the
speed of transmission through CADO permits simultaneous
transmission over all lines.

Output

Data is transferred to the CADO by a standard input-output
order, the program giving the starting location in memory
and the number of words to be transferred.

Prog ra m mi ng

The SPADATS CAD is an example of the multiplexers developed by the Philco Computer
Division for connecting the Philco 2000 simultaneously to large numbers of communications lines.
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