Keyboard unit control system using block scanning techniques

Details Keyboard unit control system using block scanning techniques Keyboard unit control system using block scanning techniques

1982-08-04

1986-05-27

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 400479, G06F 302

Patent

active

045918333

ABSTRACT:
A keyboard unit control system having a port which includes a block selection register for specifying one of a plurality of blocks of scanning lines and a scanning data selection register for specifying one of the scanning lines of the corresponding block. The scanning data and block data are supplied to a keyboard unit through the scan line selecting logic. When the operator depresses a key on the keyboard unit, the key is detected by an interrupt detector and a detection signal is supplied to a CPU. The CPU first scans the blocks and then scans the scanning lines in the corresponding block.

REFERENCES:
patent: 4020467 (1977-04-01), Hashimoto
patent: 4138916 (1979-02-01), Kitagawa
patent: 4138917 (1979-02-01), Sakashita
patent: 4148017 (1979-04-01), Tomisawa
patent: 4170768 (1979-10-01), Kitagawa
patent: 4263582 (1981-04-01), Dumbovic
patent: 4277780 (1981-07-01), Sonderman
patent: 4335374 (1982-06-01), Nyuji
Roger Munt, Microprocessors, vol. 2, No. 2, "Microprocessor Keyboard Encoding", Apr. 1978, pp. 67-70.
A. B. Wilkinson, Electronic Engineering, vol. 53, No. 654, "Utilising a Calculator as a Microprocessor Display/Keyboard", Jul. 1981, pp. 25-26.

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