JPS6426261A - System for switching device mode of extending device - Google Patents

System for switching device mode of extending device

Info

Publication number
JPS6426261A
JPS6426261A JP18387087A JP18387087A JPS6426261A JP S6426261 A JPS6426261 A JP S6426261A JP 18387087 A JP18387087 A JP 18387087A JP 18387087 A JP18387087 A JP 18387087A JP S6426261 A JPS6426261 A JP S6426261A
Authority
JP
Japan
Prior art keywords
mode
extending
main body
output
input
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
JP18387087A
Other languages
Japanese (ja)
Inventor
Atsuki Muramatsu
Yuji Kobayashi
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
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering 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, NEC Engineering Ltd filed Critical NEC Corp
Priority to JP18387087A priority Critical patent/JPS6426261A/en
Publication of JPS6426261A publication Critical patent/JPS6426261A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To automatically execute a mode switching according to the mode change of a main body device by providing a identifying means to identify an I/O command and an I/O address recognized commonly for a system, and a means to switch a mode and to set it. CONSTITUTION:A circuit 1 to identify the input/output address of a mode switching input and output command which is common for the system and a means 2 to fetch mode data to output to a data bus during this input/output command period, to switch the mode by these mode data and to set the mode are provided. Thus, without setting a mode changing-over switch on an extending device, and without defining a special signal line to show the mode of the main body on an extending bus, the mode of the extending device can be switched simultaneously with the mode switching of the main body device.
JP18387087A 1987-07-22 1987-07-22 System for switching device mode of extending device Pending JPS6426261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18387087A JPS6426261A (en) 1987-07-22 1987-07-22 System for switching device mode of extending device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18387087A JPS6426261A (en) 1987-07-22 1987-07-22 System for switching device mode of extending device

Publications (1)

Publication Number Publication Date
JPS6426261A true JPS6426261A (en) 1989-01-27

Family

ID=16143267

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18387087A Pending JPS6426261A (en) 1987-07-22 1987-07-22 System for switching device mode of extending device

Country Status (1)

Country Link
JP (1) JPS6426261A (en)

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