IBM System/7 Functional Characteristics - All about the IBM 1130 ...

Bit0 Error/Exception Status Bit—This bit is on whenever any error bitis set or an exception condition occurs.1 EBCDIC Check Sum—This bit is on when an error is detected inthe EBCDIC translate table.2 Command Reject—This bit is set when the attachment is notcapable of executing the command.3 Reader not Ready.4 Equipment Check—This bit is set for one of the following:1. Feed Check2. Emitter Sync Check3. Hardware checkFurther information as to cause is found in status word 2.5 Data Check—This bit is set for a validity check.6 End of File—This bit is set when EOF switch is on, the hopper isempty and the last card has been read.7 End of File Switch—This bit is set on when the EOF switch is in theON position.8 Storage Data Check—The storage location accessed by the attachmentduring the current instruction contained bad parity.9 Program Check—The main storage address presented by the attachmentduring the current cycle steal input/output operation for dataexceeds storage size installed in the system.10 Hardware Check Sum Error.11 Invalid Command—This bit is set any time an invalid 2502 is issued.12 2502 Attached.13 Device End—This bit will be set whenever the attachment/deviceoperation is terminated. This bit generates a interrupt request toalert the program that the attachment may accept new commands.14 Printer Attached.15 Status Word 2 Indicator—This bit is set to indicate additionalinformation may be found in Status Word 2.IBM 5024 I/O Attachment Enclosure 17-13