| 摘要 |
PURPOSE:To realize automatic buffering to a key input buffer by extracting the input line images out of a memory part in a prescribed order and supplying them to a key input buffer every time an interruption of key input request is delivered from a host device. CONSTITUTION:When an interruption of line input request is given from a CPU, an extracting part 70 checks the contents of a character number part stored in the address position of an RAM30 shown by a pointer register 50. When the contents show no zero, the part 70 extracts the contents of the corresponding input line out of the RAM30 in accordance with the corresponding character number and transfers the contents to a key input buffer 60. Then the part 70 replaces the contents of the register 50 as so to show a character number part of the next input line image. Then the part 70 sends an answer interruption showing that the key input data is prepared back to the CPU and waits for the next interruption of line input request. |
