IBM 5280 Distributed Data System - Index of

• Numeric Field: For a numeric field. the Field- key is valid only if the fieldexit minus flag (bit 3 of byte hex 3D into the lOB) is zero. The function isJ,Jrocessed as described above for the numeric-oniy fieid except that the negativegraphic is not displayed .• The Field- key is not valid for any other field definition.Field Exit Minus/Dash FunctionThe field exit minus/dash function is initiated when the operator presses thelowercase dash key on the data entry keyboard.In all modes, if the cursor is positioned within a field in which the field- key isallowed [a signed numeric, numeric only, digits only, and (if the field- key enableflag is 0) a numeric field] , a field minus function is performed. Otherwise, thiskey is processed as a dash/minus data key.Hex FunctionThe hex function is valid only when an ENTR command is being processed. It isnot valid for a hex field or when the system is awaiting field exit or record advance.In all modes, the hex function is selected with a command key sequence from theoperator or by the application program issuing a keyboard operation (KEYOP)for a keyboard function. When the hex function is selected, the keyboard isplaced in hex mode. The next two keystrokes must be 0-9 or A-F, and arecombined to make one EBCDIC value. This EBCDIC value is then processed asa data character. It is not necessary to use the shift key to select the hexcharacters.If the operator presses the Reset key after the Cmd key and the Hex key havebeen pressed, CJr after the first of the two hex character keystrokes has beenpressed, no data is processed and hex mode is cleared. If a key other than the0-9 or A-F key is pressed following the Cmd key and the Hex key, an error occurs.The operator must press the Reset key; hex mode is cleared and no data isprocessed.Insert FunctionThe insert function is initiated when the operator presses the Ins (Insert) key. TheIns key is valid only when an ENTR command is being processed. The Ins key isnot valid in a field defined as mandatory fill.In enter, update, special verify, and field correct modes, when the Ins key is pressedthe keyboard is placed in insert mode. The insert mode symbol is displayed inposition 14 of the status line. When the operator presses a data key, the datacharacter is inserted into the field in the current cursor position. All field positionsto the right of the cursor, and the cursor and character above the cursor, are shiftedone position to the right. If the character that would be shifted out of the end ofthe field is not blank, an error occurs. If the cursor is in the rightmost position ofa field 'vvhen an attempt is made to insert a character, an error occurs. Any attemptto exit a field while in insert mode causes an error. The operator can cancel insertmode by pressing the Reset key.330