| 摘要 |
<p>An interface unit for connection between computers having a timed transfer output interface and hardcopy output devices operating on a parallel handshaking principle comprises a microprocessor (1) connected between the computer and the output device by respective hardware units. The hardware unit connected to the computer includes a Status Buffer (4) divided into two parts (9) and (10) one of which (10) is an intermediate transfer area between the microprocessor and the computer interrogated Status Buffer (9). Transfer from part (10) to part (9) is controlled so that the computer can control status and so that timing restrictions are met. Means are provided for avoiding loss of data when the output device is rendered inoperable. </p> |
