IBM 5280 Distributed Data System - Index of

If the compare of options does not match according to the following diagram, anexternal status (0727) occurs. The error code is saved in the lOB, the appropriateexternal status code and external status bit are set, and a branch is taken to theexternal status subroutine.R=ReadW=WriteS=Share~NewR/RSRI R/R RIRS &WS WSOKOKRI WI W/R WI WI R&WI R&WI R&WINS RS &WS WS NS RS R&WS WSR&WINSR/R&WSOKOKOK OK OK OKRIWSR/NSOKOKW/RSOKOKW/R&WSOKOKOK OK OK OKWIWSWINSOKOKR&WIRSOKR&WIR&WSOKOKOKR&WIWSOKR&WINSKEYBOARD/DISPLAY I/O CONTROLThe keyboard/display attachment consists of a keyboard adapter, a display adapter,keyboard/display storage, and the keyboard/display microprocessor. Optional ~magnetic stripe readers and an optional elapsed time counter may also be included.The keyboard/display microprocessor handles all data entry via the keyboard. It canhandle up to four keyboards. For each keyboard it processes keyboard functionsand data entry, and detects keystroke errors. It processes keystrokes and handlesthe character display according to the keyboard/display storage information. It usesa screen format control string, which is generated from the application program, tocontrol the format of the input record as it is displayed on the screen and enteredinto the I/O buffer.5280 Functions and Storage Overview 19