JPS57113129A - Communication system in computer device - Google Patents
Communication system in computer deviceInfo
- Publication number
- JPS57113129A JPS57113129A JP18798080A JP18798080A JPS57113129A JP S57113129 A JPS57113129 A JP S57113129A JP 18798080 A JP18798080 A JP 18798080A JP 18798080 A JP18798080 A JP 18798080A JP S57113129 A JPS57113129 A JP S57113129A
- Authority
- JP
- Japan
- Prior art keywords
- data
- shared memory
- central processor
- display
- display device
- 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
Landscapes
- Information Transfer Systems (AREA)
- Digital Computer Display Output (AREA)
Abstract
PURPOSE: To use a shared memory stored with commands, data, status signals, and error status signals for communication between a central processor and a display device.
CONSTITUTION: For writing data A, the logical state of a busy signal 502 showing whether a display device 20 is busy or not is confirmed and when so, a central processor 10 transmits a halt signal 501 to the device 20 to set the input and output part of the device 20 connected to an address line 401, a data line 402, etc., as the input and output part of the device 20 in a high impedance state, thereby writing the data A in a shared memory 40. Then, the device 20 reads the data out of the shared memory 40 after the halt signal 501 is reset, and consequently data A is transferred from the central processor 10 to the display device 20 to display it on a display board 201.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18798080A JPS57113129A (en) | 1980-12-29 | 1980-12-29 | Communication system in computer device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18798080A JPS57113129A (en) | 1980-12-29 | 1980-12-29 | Communication system in computer device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57113129A true JPS57113129A (en) | 1982-07-14 |
Family
ID=16215500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18798080A Pending JPS57113129A (en) | 1980-12-29 | 1980-12-29 | Communication system in computer device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57113129A (en) |
-
1980
- 1980-12-29 JP JP18798080A patent/JPS57113129A/en active Pending
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