DK230387A - MEMORY DEVICE - Google Patents

MEMORY DEVICE

Info

Publication number
DK230387A
DK230387A DK230387A DK230387A DK230387A DK 230387 A DK230387 A DK 230387A DK 230387 A DK230387 A DK 230387A DK 230387 A DK230387 A DK 230387A DK 230387 A DK230387 A DK 230387A
Authority
DK
Denmark
Prior art keywords
bank
chip rom
banks
selecting data
selecting
Prior art date
Application number
DK230387A
Other languages
Danish (da)
Other versions
DK230387D0 (en
DK169367B1 (en
Inventor
Katsuya Nakagawa
Original Assignee
Nintendo 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 Nintendo Co Ltd filed Critical Nintendo Co Ltd
Priority to DK230387A priority Critical patent/DK169367B1/en
Publication of DK230387D0 publication Critical patent/DK230387D0/en
Publication of DK230387A publication Critical patent/DK230387A/en
Application granted granted Critical
Publication of DK169367B1 publication Critical patent/DK169367B1/en

Links

Landscapes

  • Microcomputers (AREA)
  • Storage Device Security (AREA)

Abstract

A memory cartridge is loaded in the main unit of a personal computer when it is to be used. The memory cartridge comprises a case, and a printed circuit board which is installed therein and on which a large-capacity, one-chip ROM is mounted. The storage area of the one-chip ROM is divided into a plurality of banks each having a number of memory addresses which are accessible by a central processing unit of the main unit, and one specific bank among them is allocated to an address space which is constantly accessible by the central processing unit. Bank-selecting data for selecting other banks is stored in this specific bank. The bank-selecting data is read out during the course of a program stored in the specific bank, the data being supplied to a counter. The content of the counter is input to the three most significant bits of addresses of the one-chip ROM. The three most significant bits of the address function as bank-designating bits. An arbitrary bank of the one-chip ROM is changed over at an arbitrary timing by the bank selecting data output from the other banks of the one- chip ROM. <IMAGE>
DK230387A 1987-05-05 1987-05-05 Memory cartridge DK169367B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK230387A DK169367B1 (en) 1987-05-05 1987-05-05 Memory cartridge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK230387 1987-05-05
DK230387A DK169367B1 (en) 1987-05-05 1987-05-05 Memory cartridge

Publications (3)

Publication Number Publication Date
DK230387D0 DK230387D0 (en) 1987-05-05
DK230387A true DK230387A (en) 1988-11-06
DK169367B1 DK169367B1 (en) 1994-10-10

Family

ID=8111470

Family Applications (1)

Application Number Title Priority Date Filing Date
DK230387A DK169367B1 (en) 1987-05-05 1987-05-05 Memory cartridge

Country Status (1)

Country Link
DK (1) DK169367B1 (en)

Also Published As

Publication number Publication date
DK230387D0 (en) 1987-05-05
DK169367B1 (en) 1994-10-10

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Legal Events

Date Code Title Description
B1 Patent granted (law 1993)
PBP Patent lapsed

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