Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-09-08
1986-09-02
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340365R, 400476, G06F 302
Patent
active
046099085
ABSTRACT:
A repeat control apparatus for a serial keyboard interface apparatus has a one-chip microprocessor which serves as a keyboard controller. A RAM section in the microprocessor includes an area for holding a set value RCD.sub.A for repeat start timing control, an area for holding a set value RCD.sub.B for repeat time interval control, a counter area for permitting RCD.sub.A to be set as a preset value and for making a sequential down count according to the number of pollings from a terminal main unit, and a counter area for permitting RCD.sub.B to be set as a preset value and for making a sequential down count according to the number of pollings from the terminal main unit. The terminal main unit performs the polling operation with respect to a keyboard controller. The number of pollings is counted on the side of the keyboard controller, after the key operation has been performed. When the count value reaches a value initially set from the terminal main unit, a repeat operation is executed. A specific code is added to a key code input from a repeat function-equipped key, through the keyboard controller, which code shows that the key code is a repeat key code. The terminal main unit performs a key input control function with respect to a key code which permits a repeat key operation; and with respect to a key code which does not permit such repeat key operation.
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Radio Fernsehen Elektronik, vol. 28, No. 12, Dec. 1979, Berlin, (DE), pp. 795-798, R. Bauch: "Handeingabesysteme fur Prozess-steuerungen auf Mikrorechnerbasis", p. 795, col. 1-col. 2, lines 1-20; p. 797, col. 3, lines 1-8; FIG. 4.
Electro/81 Conference Record, vol. 6, Apr. 7-9, 1981, pp. 1-9, New York, (US). G. E. Charest: "Distributed Microprocessor Control with IPC's", pp. 1-3; FIGS. 2, 3.
Wireless World, vol. 87, No. 1545, Jun. 1981, Sheepen Place, pp. 77-78, Colchester, (GB), M. D. Alger et al.: "Remote Keyboard Interface", p. 78, paragraph: Circuit Operation.
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Caldwell Sr. John W.
Heim Michael F.
Tokyo Shibaura Denki Kabushiki Kaisha
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