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Typewriter Testing Unit

IP.com Disclosure Number: IPCOM000075252D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Preskett, IW: AUTHOR

Abstract

This typewriter testing unit is for testing a range of typewriters. The testing unit provides conditions substantially identical to those experienced by the typewriter under test when in use in its related system, or in combination with other equipment.

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Typewriter Testing Unit

This typewriter testing unit is for testing a range of typewriters. The testing unit provides conditions substantially identical to those experienced by the typewriter under test when in use in its related system, or in combination with other equipment.

Most typewriters are plugged directly into the front panel of the testing unit, but extension cables are provided for typewriters that have short leads. A selector switch in the testing unit ensures that only the correct combination of circuits in the unit is used for testing the typewriter under test.

After connection to the unit, the typewriter under test is caused to operate in a selected mode by supplying input signals similar to those which would be received from the system in normal operation. Input signals in B.C.D. form can be supplied either from paper tape, or from a keyboard, or from special switches. Indicator lights display the input signals so that keyboard encoding and typewriter decoding can be checked.

In operation the testing unit is sensitive to the receipt of some or all of the following test signals from the typewriter under test. E.O.L. (end of line), E.O.F. (end of forms), INT N#C (Interlock normally closed), INT N#O (Interlock normally open), CAMS N#C (cams normally closed), BUSY (typewriter operating), NOT BUSY (typewriter not operating). Using the sockets provided, all test signals can be tested with an oscilloscope.

The test signals are all supplied to an AND gate...