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Browse Prior Art Database

Keyboard Interface Device

IP.com Disclosure Number: IPCOM000045770D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Jackson, HC: AUTHOR

Abstract

Human factors testing on various products, such as the keyboards on typewriters, etc., requires a computer attachment to the typewriter such that the computer can monitor all keyboard activities. Also, the computer must be able to emulate the typewriter keyboard. This article describes a general-purpose interface box which attaches a typewriter, printer, or the like or other devices to a computing system.

This text was extracted from a PDF file.
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Keyboard Interface Device

Human factors testing on various products, such as the keyboards on typewriters, etc., requires a computer attachment to the typewriter such that the computer can monitor all keyboard activities. Also, the computer must be able to emulate the typewriter keyboard. This article describes a general-purpose interface box which attaches a typewriter, printer, or the like or other devices to a computing system.

A functional block diagram of the interface box is shown above.

The box features selectable data rates of 2400, 4800 or 9600 bits per second. On the device attachment side of the box, there is provided a card slot and cable arrangement (not shown) which enables the box to be attached to virtually any electronic typewriter or printer. A unique attachment card 10 must be plugged into the card slot. The unique device attachment card 10 is designed according to the peculiarities of the particular device to be attached. The internal arrangement of the box is identified by numeral 12.

The architecture of the interal arrangement is such that the box can be coupled to a wide variety of devices. The protocol control means 14 features the following types of operations: request, acknowledge, negative acknowledge, reset, send and receive data, sense, status and full error checking of the protocol itself. The protocol control means 14 has built-in automatic retry in case of an error which automatically shuts down after a programmable number of retri...