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

1111111■111111PIO instruction Function ModifierDevice addressSubaddressZerosDisk StorageImmediate write 0 0 1Write data 0 0 0 1 * * * * * *Load next sector ID 0 0 1 0Seek 0 0 1 1Format track 0 1 0 0Read verify 0 1 0 1Read initialize 0 1 1 0Write initialize 0 1 1 1Terminate 1 0 0 0Write diagnostic control 1 0 1 1Immediate read 0 1 0Read data 0 0 0 1 * * * * * *Read sector ID 0 0 1 0Read ISW 0 0 1 1Read ISWEX 1 0 1 1Read residual address 1 1 1 1Start read 1 1 0Read cycle steal 0 0 0 1 * * * * * *Read verify cycle steal 0 0 1 0Start write 1 1 1Write cycle steal 0 0 0 1 * * * * * ik-All I/O modulesImmediate read 0 1 0Read module ID 0 1 0 0 * * * * *Read module ID extension 0 1 0 1Read DSW 0 1 1 1Prepare I/O 01 1 * * * * XXX X 00Halt I/0 1 0 0* * * * XX XX 00Processor moduleImmediate read 0 1 0Read direct controlchannel status word * * * * 0 1 0 0 0 0Set interrupt 1 0 1 * * * * 0 0 0 0 0 0* * Indicates bits not used, but must be set to 0.