JPS5667464A - System with memory device - Google Patents

System with memory device

Info

Publication number
JPS5667464A
JPS5667464A JP14381079A JP14381079A JPS5667464A JP S5667464 A JPS5667464 A JP S5667464A JP 14381079 A JP14381079 A JP 14381079A JP 14381079 A JP14381079 A JP 14381079A JP S5667464 A JPS5667464 A JP S5667464A
Authority
JP
Japan
Prior art keywords
memory
area
bus
blocks
selective
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
JP14381079A
Other languages
Japanese (ja)
Inventor
Chuya Inoue
Takao Asaka
Sunao Sugiyama
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP14381079A priority Critical patent/JPS5667464A/en
Publication of JPS5667464A publication Critical patent/JPS5667464A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Computer Display Output (AREA)

Abstract

PURPOSE: To lighten a load on software by dividing the address space of an address bus into two by connecting memory blocks in parallel and by using one division as a common area and the other as a main memory unit by selecting it by a selective signal.
CONSTITUTION: Auxiliary memory device MS0 consisting of memory blocks MS1W MS8 is provided and they are connected in parallel and also connected to address bus AB and data bus DB. Memory selecting circuit SE, receiving the most significant digit bit signal of bus AB and a selective signal from the I/O port of microprocessor μP, selects one of blocks MS1WMS8. When the AB has an address space of 64K, the former half of 32K is assigned for a common part as a program area and the latter half of 32K for a selective area changed-over by the program as a data area. When main memory unit MM and each block has a memory capacity of 32K each, a memory space of 288K can be obtained, so that the software will be facilitated.
COPYRIGHT: (C)1981,JPO&Japio
JP14381079A 1979-11-08 1979-11-08 System with memory device Pending JPS5667464A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14381079A JPS5667464A (en) 1979-11-08 1979-11-08 System with memory device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14381079A JPS5667464A (en) 1979-11-08 1979-11-08 System with memory device

Publications (1)

Publication Number Publication Date
JPS5667464A true JPS5667464A (en) 1981-06-06

Family

ID=15347493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14381079A Pending JPS5667464A (en) 1979-11-08 1979-11-08 System with memory device

Country Status (1)

Country Link
JP (1) JPS5667464A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58203560A (en) * 1982-05-24 1983-11-28 Toshiba Corp Processor of program
JPS59202558A (en) * 1983-05-04 1984-11-16 Ascii Corp Switching circuit of slot for expansion in personal computer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58203560A (en) * 1982-05-24 1983-11-28 Toshiba Corp Processor of program
JPS59202558A (en) * 1983-05-04 1984-11-16 Ascii Corp Switching circuit of slot for expansion in personal computer

Similar Documents

Publication Publication Date Title
JPS5661082A (en) Two level memory integrated circuit
JPS5547546A (en) Microcomputer circuit
EP0358300A3 (en) Extended input/output circuit board addressing system
JPS5667464A (en) System with memory device
JPS5634198A (en) Releaving method of deficient bit of semiconductor memory
JPS5398741A (en) High level recording and processing system
JPS55108057A (en) Duplex control unit
JPS5437646A (en) Program loading system
JPS5633749A (en) Address control device
JPS526032A (en) Main storage control unit
JPS5466732A (en) Data buffer control unit in data transfer unit
JPS55105722A (en) Initial program load system
JPS5663676A (en) Pattern generator
JPS5733472A (en) Memory access control system
JPS5353930A (en) Input and output control system
JPS5616225A (en) Input selection circuit for microcomputer
JPS5491030A (en) Terminal accommodation system of communication controller
JPS5730027A (en) Communication controller
JPS52107744A (en) Program control order circuit
JPS5714934A (en) Input/output channel
JPS6435639A (en) Rom/ram memory access switching circuit
JPS5617424A (en) Data transfer system
JPS5264253A (en) Digital filter
JPS55140953A (en) Abnormal operation detecting system for computer system
JPS52130250A (en) Plural number of channels control system