Electronic equipment having a second function keying system

Details Electronic equipment having a second function keying system Electronic equipment having a second function keying system

1982-03-01

1984-11-06

Malzahn, David H.

Boots, shoes, and leggings

364709, G06F 314

Patent

active

044815980

ABSTRACT:
An electric equipment such as a desk-top calculator having a unit conversion function is disclosed. In addition to a main-display for displaying input numeric data and results of operations, a sub-display is provided on a keyboard to display functions assigned to keys in a second function mode and then display a selected one of the functions. By watching the sub-display, an operator can identify the function for which a unit conversion operation was carried out.

REFERENCES:
patent: 3892958 (1975-07-01), Tung
patent: 3973113 (1976-08-01), Goldsamt
patent: 4001569 (1977-01-01), Dickinson et al.
patent: 4044242 (1977-08-01), Laesser
patent: 4078257 (1978-03-01), Bagley
patent: 4202038 (1980-05-01), Petersson
patent: 4228516 (1980-10-01), Johnston
patent: 4280121 (1981-07-01), Crask
patent: 4386412 (1983-05-01), Ito
Bigbie, et al., "Programmable Key/Display/Switch Device," IBM Tech. Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, pp. 442-444.

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