JPS5676822A - Control system for input/output device - Google Patents

Control system for input/output device

Info

Publication number
JPS5676822A
JPS5676822A JP15249379A JP15249379A JPS5676822A JP S5676822 A JPS5676822 A JP S5676822A JP 15249379 A JP15249379 A JP 15249379A JP 15249379 A JP15249379 A JP 15249379A JP S5676822 A JPS5676822 A JP S5676822A
Authority
JP
Japan
Prior art keywords
port
input
output
output device
bits
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
JP15249379A
Other languages
Japanese (ja)
Inventor
Masaaki Ogura
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15249379A priority Critical patent/JPS5676822A/en
Publication of JPS5676822A publication Critical patent/JPS5676822A/en
Pending legal-status Critical Current

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  • Microcomputers (AREA)

Abstract

PURPOSE: To decrease the number of I/Os to the computer, by allotting 1 or several bits of the specified port of the I/O to the input use of the decision signal which decides the type of the input/output device and then executing the program exclusive for input/output in accordance with the decision signal.
CONSTITUTION: The I/O port (input/output element) 5 is provided to secure a connection between the CPU, RAM and ROM of the microcomputer 1 and the input/output device 6. The port 5 is formed with the output port 5a, input port 5b and control port 5c of 8 bits each; and the input port 6a, output port 6b and control port 6c are provided to the input/output device 6 opposite to the port 5. Then the 8 bits of the port 5c of the port 5 are allotted to the input use of the control signal which decides the type of the device 6. Thus the program supplied to or delivered from the port 5b or port 5a can be executed in accordance with the control signal. In this way, the number of the ports 5 can be reduced.
COPYRIGHT: (C)1981,JPO&Japio
JP15249379A 1979-11-27 1979-11-27 Control system for input/output device Pending JPS5676822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15249379A JPS5676822A (en) 1979-11-27 1979-11-27 Control system for input/output device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15249379A JPS5676822A (en) 1979-11-27 1979-11-27 Control system for input/output device

Publications (1)

Publication Number Publication Date
JPS5676822A true JPS5676822A (en) 1981-06-24

Family

ID=15541664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15249379A Pending JPS5676822A (en) 1979-11-27 1979-11-27 Control system for input/output device

Country Status (1)

Country Link
JP (1) JPS5676822A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58139228A (en) * 1982-02-10 1983-08-18 Nec Corp Controlling system of interface of peripheral device
JPS58178428A (en) * 1982-04-14 1983-10-19 Hitachi Ltd Data processor
JPS58178429A (en) * 1982-04-02 1983-10-19 アムペックス　コ−ポレ−ション Universal interface unit
JPS5972550A (en) * 1982-10-19 1984-04-24 Ricoh Co Ltd Presence or absence deciding system of program memory for option
JPS6177950A (en) * 1984-09-25 1986-04-21 Shimadzu Corp Interface device
JPS61166660A (en) * 1985-01-20 1986-07-28 Panafacom Ltd Input and output system
JPS6278662A (en) * 1985-10-02 1987-04-10 Chino Corp Input-output device
JPS62128350A (en) * 1985-11-27 1987-06-10 テクトロニツクス・インコ−ポレイテツド Universal module interface
JPS63651A (en) * 1986-06-19 1988-01-05 Pfu Ltd Automatic system discrimination control system
JPS6331444U (en) * 1986-08-19 1988-03-01

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5541546A (en) * 1978-09-20 1980-03-24 Hitachi Ltd Peripheral device coupling unit
JPS5548273B2 (en) * 1973-01-22 1980-12-04

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5548273B2 (en) * 1973-01-22 1980-12-04
JPS5541546A (en) * 1978-09-20 1980-03-24 Hitachi Ltd Peripheral device coupling unit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58139228A (en) * 1982-02-10 1983-08-18 Nec Corp Controlling system of interface of peripheral device
JPS58178429A (en) * 1982-04-02 1983-10-19 アムペックス　コ−ポレ−ション Universal interface unit
JPS58178428A (en) * 1982-04-14 1983-10-19 Hitachi Ltd Data processor
JPS5972550A (en) * 1982-10-19 1984-04-24 Ricoh Co Ltd Presence or absence deciding system of program memory for option
JPH0430060B2 (en) * 1982-10-19 1992-05-20
JPS6177950A (en) * 1984-09-25 1986-04-21 Shimadzu Corp Interface device
JPS61166660A (en) * 1985-01-20 1986-07-28 Panafacom Ltd Input and output system
JPS6278662A (en) * 1985-10-02 1987-04-10 Chino Corp Input-output device
JPS62128350A (en) * 1985-11-27 1987-06-10 テクトロニツクス・インコ−ポレイテツド Universal module interface
JPS63651A (en) * 1986-06-19 1988-01-05 Pfu Ltd Automatic system discrimination control system
JPS6331444U (en) * 1986-08-19 1988-03-01

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