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

Page of GA34-0003-6, -7As Updated August 20, 1976By TNL GN34-0340Significant Bits Meaning1 Command reject. The addressed device has received acommand that it is not designed to execute, or that it cannotexecute because of the device's present state. Conditioncode 1 is set and the command is not executed. This commandreject bit may also be set in conjunction with setting on thefollowing bits 3 or 4.3 Operator station check. May be caused by:a. operator station motor not running.b. operator station not being prepared to requestinterruptions.c. issuing a punch command when there is a low papertape supply in the punch.d. issuing a command, other than read ISW, and theoperator station is not in remote mode.e. issuing a feed or read tape command and• the paper tape reader switch is open, or• the read tape function is not selected, or• no paper tape in the reader, or• paper tape from the punch is tight.This operator station check bit may also be set in conjunctionwith the setting on of bits 1 or 15.4 Host attachment check. This bit is set on when an optionalhost attachment, such as ACCA or BSCA, detects any errorcondition. This host attachment check bit may also be setin conjunction with the setting on of command reject (bit 1).15 Invalid device address. An immediate command was issuedto the processor module but the device address is for a devicenot available in the processor module; that is, not installed oroff-line. The operator station in the local mode of operationis considered off-line.I/O Module Identification WordAll I/O commands issued to I/O modules specify a module address. This address denotesa positional address within the 5026 Enclosure(s), and can vary from 00 to 05 or from 08to OD hexadecimal. Any module except the processor module can be relocated within the5026 Enclosure(s). Thus, only the module address need be changed in the I/O commandsintended for a particular I/O module. Each I/O module presents an identification wordwhen the module is addressed by the following read-ID command:0 5 8 11 16 20 26 31Op code0 0 0 0 11 1 1 1XXX1Fun0 1 01 1Zeros0 0 0 0 01 1 1 1Mod01 0 0I I I•• • • •11 1 1MAXX XXXX1 1 1 1 10 8-F 4 0 4 0 0-3 XSixteen bits of module identification data from the addressed I/O module are stored intothe index register (R), or the accumulator if 12=000.The format for the data word is shown in Figure 4-5. Bits 1 to 7 identify the type ofI/O module installed. Bits 8 to 15 identify the devices or features installed within themodule.4-62 GA34-0003