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

oww1111111111111111111111111,1,, V WIPE. 111111111111111111. ,,,, WP .0 WNWWrite Control and Data0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 X XX 0 0 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 X XXXXX11 1 t 1 1 I I I I I I 1 1 1 1 1 1 I 1 1 1 1 1 IO••••••■•■,,,■••■••• • •■■•••■,./../vv••■••,./flaliv,8-F 2 0 1 8 0-3 XThis command stores the control and data bytes into the last two bytes of the output bufferregister in the 2790 Control. These two bytes are transferred from the index register (R),or the accumulator if R=000.After these bytes are loaded into the output buffer register, the 2790 Control transmitsto the 2790 system an active frame cycle that contains the information in the outputbuffer.Read Address0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 X XX 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 OXXXXXX1 1 I 1 i i 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1,•■•.,•■•■ ,•■■•••■• ■••■••,..■-• •-••v■-•O 8-F 4 0 0 8 0-3 XThis command stores the first two bytes of the input buffer register (area stationaddress and device address) into the index register (R), or the accumulator if R=000.These addresses are obtained by the program so that the contents of the incoming framecan be compared with the contents of the outgoing frame for validity and for future use inoutgoing frames. The addresses may also be placed by the program in the next activeoutgoing frame that is generated.Read Control and Data0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 XXX 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 XX XXXX1 1 1 I I I I I I 1 I I 1 1 1 1 1 1 1 1 1 1 1 1 1•••■••■■• ••••■./. •-■v."O 8-F 4 0 1 8 0-3 XThis command stores the last two bytes of the input buffer register (control and databytes) into the index register (R), or the 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 the area station determined by a read address command(described previously). The results of this check may also determine the control and/ordata that should be placed in the next outgoing frame. (See Figure 13-5 for valid 2790Control commands and responses.)