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

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

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Write Control and Data0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA00001 X XX 0 0 0000 000 11000 00 XXXXXX1111 II 11 1111 111 11111 11111••••■••••,„..m..i `-....,,,■■• •■■•••,,••■■•••■••■,,,,■"••••••■/••■••■•••••••••••••" ••••••■••••••••• ••••••••••".....0 8-F 2 0 1 8 0-3 XThis command stores <strong>the</strong> control and data bytes into <strong>the</strong> last two bytes of <strong>the</strong> output bufferregister in <strong>the</strong> 2790 Control. These two bytes are transferred from <strong>the</strong> index register (R),or <strong>the</strong> accumulator if R=000.After <strong>the</strong>se bytes are loaded into <strong>the</strong> output buffer register, <strong>the</strong> 2790 Control transmitsto <strong>the</strong> 2790 system an active frame cycle that contains <strong>the</strong> information in <strong>the</strong> outputbuffer.Read Address0 5 8 11 16 20 26 31Op code Fun Zeros Mod DA MA0 0 0 0 1 X X X 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 XXXXXX1111 I I 1111 11 11111 II III0 8-F 4 0 0 8 0-3 XThis command stores <strong>the</strong> first two bytes of <strong>the</strong> input buffer register (area stationaddress and device address) into <strong>the</strong> index register (R), or <strong>the</strong> accumulator if R=000.These addresses are obtained by <strong>the</strong> program so that <strong>the</strong> contents of <strong>the</strong> incoming framecan be compared with <strong>the</strong> contents of <strong>the</strong> outgoing frame for validity and for future use inoutgoing frames. The addresses may also be placed by <strong>the</strong> program in <strong>the</strong> next activeoutgoing frame that is generated.Read Control and Data0 5 8 11 16 20 26 31Op code Fun Zeros Mod DA MA0 0 0 0 1 X XX 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 XXXXXX1111 I III I 111 1111 111110 8-F 4 0 1 8 0-3 XThis command stores <strong>the</strong> last two bytes of <strong>the</strong> input buffer register (control and databytes) into <strong>the</strong> index register (R), or <strong>the</strong> accumulator if R=000.The control and data bytes should be checked for valid responses and data, respectively,every time a frame is received from <strong>the</strong> area station determined by a read address command(described previously). The results of this check may also determine <strong>the</strong> control and/ordata that should be placed in <strong>the</strong> next outgoing frame. (See Figure 14-5 for valid 2790Control commands and responses.)<strong>IBM</strong> 5013 Digital I/O Module Model Al 14-29

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