JPS5769336A - Key input display controller - Google Patents
Key input display controllerInfo
- Publication number
- JPS5769336A JPS5769336A JP55141751A JP14175180A JPS5769336A JP S5769336 A JPS5769336 A JP S5769336A JP 55141751 A JP55141751 A JP 55141751A JP 14175180 A JP14175180 A JP 14175180A JP S5769336 A JPS5769336 A JP S5769336A
- Authority
- JP
- Japan
- Prior art keywords
- key input
- delivered
- key
- screen
- data
- 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
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE: Not only to reduce the load of software but to shorten the transfer timer, by using a key input buffer and a screen memory in common under the control of a direct memory access controller.
CONSTITUTION: The 1-frame parameter of a CRT screen is analyzed by a parameter analyzing circuit 18, and the strobe signal delivered while a key input device 11 is operated is detected by an R-S type FF13. Then a request signal for direct memory access DMA transfer is delivered. The information supplied with key by the request signal of the FF13 is supplied to a screen/key input buffer memory 15 from a DMA controller 16 based on the information obtained by the circuit 18. Then the input data is transferred to the memory 15, and the same time a CRT controller 19 is controlled to reset an R-S type FF17 when the DMA transfer of data has been completed. Then an error signal to the operation of key carried out after the end of the DMA transfer of data is delivered to a CPU.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55141751A JPS5769336A (en) | 1980-10-09 | 1980-10-09 | Key input display controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55141751A JPS5769336A (en) | 1980-10-09 | 1980-10-09 | Key input display controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5769336A true JPS5769336A (en) | 1982-04-28 |
Family
ID=15299342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55141751A Pending JPS5769336A (en) | 1980-10-09 | 1980-10-09 | Key input display controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5769336A (en) |
-
1980
- 1980-10-09 JP JP55141751A patent/JPS5769336A/en active Pending
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