| 摘要 |
PURPOSE:To make it possible to use conventionally-designed programs and newly- designed programs after extension, which are mixed, by providing a program discriminating method and control operation changing method. CONSTITUTION:Bits received by line set 5-i are built up 4 into one character and an interruption is made to central controller 1. Next, controller 1 discriminates what line set the data come from to inform circuit connection device 4 of the address of memory unit 2 where data will be stored and then indicates channel adaptor 3 that when a fixed number of characters are built up, data are transmitted to the host computer. For example, when a data communication system is extended assuming that line sets before extension are 5-0 to 5-31 and extended ones are 5-32 and 5-33, interruptions to line sets 5-0 to 5-31 are processed by conventional programs before the extension, namely, BC-mode exclusive-use programs and interruptions to extended ones are processed by newly-designed, namely, EC-mode exclusive-use programs. |
