JPS5552163A - Memory extension system - Google Patents
Memory extension systemInfo
- Publication number
- JPS5552163A JPS5552163A JP12343978A JP12343978A JPS5552163A JP S5552163 A JPS5552163 A JP S5552163A JP 12343978 A JP12343978 A JP 12343978A JP 12343978 A JP12343978 A JP 12343978A JP S5552163 A JPS5552163 A JP S5552163A
- Authority
- JP
- Japan
- Prior art keywords
- data
- memory
- given
- ram
- address
- 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 easily extend the memory, by selecting the upper rank memory with the value of memory designation register and address data from CPU, and selecting the lower rank memory with the address data only of CPU independently of the memory designation register.
CONSTITUTION: The lower rank RAM2 and upper rank RAM group 3 are provided for CPU1, they are connected via the address bus 4 and data bus 5, the address data A1WA14 are given to RAM2 and RAM group 3, A0 is given only to RAM2 and further, the readout and write-in instructions R/W are given to RAM's 2 and 3. Further, A1WA14 are inputted to the decoder 7, and the output is fed to the RAM designation register 8 when the readout and write-in instructions IR/W to the input and output unit I/O are given, and the designation data is set and it is fed to the gate circuit 10. Further, CPU1 is connected to the DMA controller 13 consisting of DMA control circuit 14, DMA address counter 15 and data conversion circuit 16, and data giving and receiving is made with the line 17.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12343978A JPS5552163A (en) | 1978-10-06 | 1978-10-06 | Memory extension system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12343978A JPS5552163A (en) | 1978-10-06 | 1978-10-06 | Memory extension system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5552163A true JPS5552163A (en) | 1980-04-16 |
Family
ID=14860608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12343978A Pending JPS5552163A (en) | 1978-10-06 | 1978-10-06 | Memory extension system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5552163A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5722281A (en) * | 1980-07-16 | 1982-02-05 | Hitachi Ltd | Display unit extended in address space |
JPS58501061A (en) * | 1981-06-29 | 1983-06-30 | 松下電器産業株式会社 | Computer with extended address function |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49112547A (en) * | 1973-02-06 | 1974-10-26 |
-
1978
- 1978-10-06 JP JP12343978A patent/JPS5552163A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49112547A (en) * | 1973-02-06 | 1974-10-26 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5722281A (en) * | 1980-07-16 | 1982-02-05 | Hitachi Ltd | Display unit extended in address space |
JPS58501061A (en) * | 1981-06-29 | 1983-06-30 | 松下電器産業株式会社 | Computer with extended address function |
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