JPS5692658A - Memory unit - Google Patents
Memory unitInfo
- Publication number
- JPS5692658A JPS5692658A JP16976079A JP16976079A JPS5692658A JP S5692658 A JPS5692658 A JP S5692658A JP 16976079 A JP16976079 A JP 16976079A JP 16976079 A JP16976079 A JP 16976079A JP S5692658 A JPS5692658 A JP S5692658A
- Authority
- JP
- Japan
- Prior art keywords
- output
- memory
- address
- limit value
- comparator
- 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
Links
Abstract
PURPOSE: To make arbitrary a memory extension and to simplify the setting, by detecting the overflow from a DIP switch output designated with a final address and a comparator output of the upper limit value, in a memory system of a plurality of memory board constitutions.
CONSTITUTION: When a memory access signal is produced externally and information is given to the address line, it is input to comparators 3, 4, and when the address accessed is the lower limit value or more and within the upper limit value, the information is output to an AND gate 6. If the address exceeds the upper limit value, although the information is output from the comparator 4, output is always from the memory board handling the lower rank address space in constituting the system with a plurality of memory boards. The DIP switch 8 is provided, the logical product condition of the output and that of the comparator 4 is taken, and the output is taken as the address overflow signal. With the operation as mentioned above, the memory space is sectioned into the respective boards.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16976079A JPS5692658A (en) | 1979-12-26 | 1979-12-26 | Memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16976079A JPS5692658A (en) | 1979-12-26 | 1979-12-26 | Memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5692658A true JPS5692658A (en) | 1981-07-27 |
Family
ID=15892336
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16976079A Pending JPS5692658A (en) | 1979-12-26 | 1979-12-26 | Memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5692658A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61245259A (en) * | 1985-04-23 | 1986-10-31 | Nec Corp | Address control circuit |
-
1979
- 1979-12-26 JP JP16976079A patent/JPS5692658A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61245259A (en) * | 1985-04-23 | 1986-10-31 | Nec Corp | Address control circuit |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS56140452A (en) | Memory protection system | |
JPS5242334A (en) | Computer | |
JPS53117341A (en) | Semiconductor memory | |
JPS5345120A (en) | Video special effect device | |
JPS55102073A (en) | Electronic dictionary | |
JPS5692658A (en) | Memory unit | |
JPS54117640A (en) | Memory address designation system | |
JPS5326632A (en) | Common memory control unit | |
JPS5415620A (en) | Buffer memory unit | |
JPS5696350A (en) | Memory extension system | |
JPS56124930A (en) | Initial program loader system | |
JPS5431222A (en) | Character information memory system | |
JPS5528165A (en) | Exclusive control unit | |
JPS5745659A (en) | Memory address managing device | |
JPS5621245A (en) | Detection system of address coincidence system | |
JPS5619182A (en) | Associative memory unit | |
JPS5549759A (en) | Signal processing system | |
JPS5736331A (en) | Bus line device | |
JPS559216A (en) | Information processing circuit | |
JPS5512567A (en) | Memory protection circuit | |
JPS5680787A (en) | Pattern recognition device | |
JPS5617424A (en) | Data transfer system | |
JPS55129843A (en) | Malfunction detection system | |
JPS57159348A (en) | Microprogram control system | |
JPS54131839A (en) | Input/output mechanism for remote monitor device |