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

Bit patternCode name Hex Response Command0123 4567Read commands (from System/7)Read 06 0000 0110Read null 02 0000 0010Read data OA 0000 1010Read end OE 0000 1110Read responses (from area station)Read request 12 0001 0010Read cmd acknowledge 46 0100 0110Read data request 62 0110 0010Read data acknowledge 6A 0110 1010Read end request 72 0111 0010Read end acknowledge 3E 0011 1110Read null acknowledge 42 0100 0010Write commands (from System/7)Write 05 0000 0101Write null 01 0000 0001Write data 09 0000 1001Write end OD 0000 1101Write responses (from area station)Write data request 51 0101 0001Write data acknowledge 69 0110 1001Write end request 71 0111 0001Write end acknowledge 3D 0011 1101Write null acknowledge 41 0100 0001Write cmd acknowledge 45 0100 0101Control commands (from System/7)Bypass OB 0000 1011Restore 03 0000 0011Send sync 04 0000 0100Begin diagnostic 08 0000 1000End diagnostic OC 0000 11002792 Reset OF 0000 1111Control responses (from area station)Bypass acknowledge 6B 0110 1011Restore acknowledge 63 0110 0011(response to send sync cmd) 47 0100 0111Begin diagnostic acknowledge 68 0110 1000End diagnostic acknowledge 4C 0100 1100RESPONSE COMMANDBits 0123 4567Restore ack I00 Send sync, or Begin/end diag2792 Idle bit 01 Write1= Data mode 10 Read11 ControlNo latch 00 00 NullSery req 01 01Char sery 10 10 DataEnd latch 11 11 EndFigure 13-5. 2790 loop commands and responsesIBM 5012 Multifunction Module Model Al 13-31