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

If an error is detected during a data transfer on the internal interface or in storage, thedata address register contains the address associated with the word that failed to transfer.The any:error bit (bit 3), channel-end bit (bit 11), device-end bit (bit 13), and theappropriate error bit are set in the ISW.If a check character error for data is detected, the data address register contains anaddress one greater than that of the last word transferred. The any-error bit (bit 3),channel-end bit (bit 11), device-end bit (bit 13), and the read-ISWEX bit (bit 15) are setin the ISW. The ISWEX contains the file-data-check bit (bit 4).If an overrun is detected (that is, file data service requirements are not met) the dataaddress register contains the address associated with the word where data service failed.The overrun bit (bit 2), any-error bit (bit 3), channel-end bit (bit 11), and the device-endbit (bit 13) are set in the ISW. (See "Operating and Programming Restrictions" in thischapter.)If the track index pulse is encountered before the count becomes zero, the data addressregister contains an address one greater than the address associated with the last wordtransferred successfully. The incorrect-length-record bit (bit 6), any-error bit (bit 3),channel-end bit (bit 11), and the device-end bit (bit 13) are set in the ISW.If the count becomes zero during the data transfer and no errors are detected, a normalend condition occurs. The data address register contains an address one greater than theaddress of the last word transferred successfully. The channel-end bit (bit 11) and thedevice-end bit (bit 13) are set in the,ISW.Load Next Sector ID0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA00001 XXXO 01 000000010 ******XXXXXX1 iii II II Iitl III 1111 I 111110 8-F 2 0 2 0 0-3 XThis command loads into an ID buffer the next sector ID that passes under a selectedread/write head. The disk and head are specified by the control information word containedin the index register (R), or the accumulator if R=000. The control informationword has the following format:0 1 2 15R HX 0 0 0 0 0 0 0 0 0 0 0 0 0 0IX 0 0 0For models 1 and 2 of the disk storage module, the R-bit selects the disk (upper or lower)for use by this and subsequent read or write commands addressed to the module. R=0selects the upper disk; R=1 selects the lower disk. For models 3 and 4, the R-bit alwaysequals 1.15-16 GA34-0003