JPS54161831A - Encoding system of keyboard - Google Patents

Encoding system of keyboard

Info

Publication number
JPS54161831A
JPS54161831A JP7031878A JP7031878A JPS54161831A JP S54161831 A JPS54161831 A JP S54161831A JP 7031878 A JP7031878 A JP 7031878A JP 7031878 A JP7031878 A JP 7031878A JP S54161831 A JPS54161831 A JP S54161831A
Authority
JP
Japan
Prior art keywords
line
switching
output
delivered
lines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7031878A
Other languages
Japanese (ja)
Inventor
Masahiko Takeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7031878A priority Critical patent/JPS54161831A/en
Publication of JPS54161831A publication Critical patent/JPS54161831A/en
Pending legal-status Critical Current

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  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To increase both the maximum key number and the types of output codes with the capacity of the coded ROM kept as it is by switching the optional line of the key matrix in time division and using the switch information.
CONSTITUTION: The key matrix is composed of X and Y address lines. And sometimes the addition of one more piece of the line desired to the X line, that is, line X10 is added. The switching of the lines is carried out by the output of ring counter 4. The output of line X1 is added to counter 12, and lines X2 and X10 are switched alternately with every cycle of signal 10 of line X1. The data delivered from ROM7 with every switching is supplied to programable ROM16 and then delivered through the code alteration. If the time devision is applied to other keys, the codes double as much as the key number can be delivered.
COPYRIGHT: (C)1979,JPO&Japio
JP7031878A 1978-06-13 1978-06-13 Encoding system of keyboard Pending JPS54161831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7031878A JPS54161831A (en) 1978-06-13 1978-06-13 Encoding system of keyboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7031878A JPS54161831A (en) 1978-06-13 1978-06-13 Encoding system of keyboard

Publications (1)

Publication Number Publication Date
JPS54161831A true JPS54161831A (en) 1979-12-21

Family

ID=13427975

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7031878A Pending JPS54161831A (en) 1978-06-13 1978-06-13 Encoding system of keyboard

Country Status (1)

Country Link
JP (1) JPS54161831A (en)

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