JPS5692626A - Input/output control system - Google Patents
Input/output control systemInfo
- Publication number
- JPS5692626A JPS5692626A JP16989579A JP16989579A JPS5692626A JP S5692626 A JPS5692626 A JP S5692626A JP 16989579 A JP16989579 A JP 16989579A JP 16989579 A JP16989579 A JP 16989579A JP S5692626 A JPS5692626 A JP S5692626A
- Authority
- JP
- Japan
- Prior art keywords
- inquiry
- input
- scanning
- output
- gate
- 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 reduce the instruction start time of input/output control device, by scanning and referring the inquiry memory before the end of operation of I/O is informed to CPU, and providing the means to store the content when inquiry is made.
CONSTITUTION: A scanning circuit II12 is started with a machine cycle and signal, and the input of a multiplexer MPX3, i.e., the scanning of the content of an inquiry memory 1 is made before the information of CPU. As a result, if at least one inquiry state is present in the memory 1, FF15 is set and the presence of inquiry is stored. Thus, an AND gate 9 is closed and the input and output start instruction is waited. After that, FF8 is set with the scanning end signal I of a scanning circuit I11, FF15 is reset with the output Q, the gate 9 is opened, the machine cycle start signal is formed, and the machine cycle start circuit 10 is started. If no inquiry is made, FF15 is not set, the output Q of FF8 is 0, the gate 9 is opened, the I/O controller is immediately operated and the instruction start time is reduced.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16989579A JPS5692626A (en) | 1979-12-26 | 1979-12-26 | Input/output control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16989579A JPS5692626A (en) | 1979-12-26 | 1979-12-26 | Input/output control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5692626A true JPS5692626A (en) | 1981-07-27 |
Family
ID=15894946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16989579A Pending JPS5692626A (en) | 1979-12-26 | 1979-12-26 | Input/output control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5692626A (en) |
-
1979
- 1979-12-26 JP JP16989579A patent/JPS5692626A/en active Pending
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