04253157 is referenced by 195 patents and cites 5 patents.

A data access system comprises a plurality of intelligent terminals capable of selectively receiving data from a data bank by means of barge-in telephone lines. Each terminal includes a basic terminal into which application modules and device control modules may be plugged. The application modules contain programs enabling the computer to perform specified functions in conjunction with certain stored subroutines within the basic terminal. A device control module enables communication by telephone with the data bank. A terminal subscribes to the data bank by transferring selectively subscription data to memory within the terminal. In one embodiment, subscription data identifying by serial numbers the terminals which are to become subscribers is circulated on subscription barge-in telephone lines. If a terminal calls a subscription line on which there appears the serial number for that terminal, the subscription data for that terminal is permanently stored within the application module of the terminal. The text data to which the terminal has subscribed is retrieved from the data bank by calling a barge-in telephone line (on which such data is circulated) if the stored subscription data shows that the subscription is in effect.

Title
Data access system wherein subscriber terminals gain access to a data bank by telephone lines
Application Number
5/947699
Publication Number
4253157
Application Date
September 29, 1978
Publication Date
February 24, 1981
Inventor
Lawrence M Haskel
Danbury
CT, US
Wallace Kirschner
Trumbull
CT, US
Agent
Darby & Darby
Assignee
Alpex Computer
CT, US
IPC
G06F 3/153
G06F 3/04
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