RCA 301 Programmer's Reference Manual
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G Sector Read Disc Simultaneous (SRS) MT usedGeneral DescriptionThiS instruction reads from a selected sector of the Data Disc File to a designated HSM location. From one toten sectors of information may be transferred from the Data Disc File with one instruction. 160 characters aretransferred for each sector designated. However, this instruction may be terminated by any other Data Disc Fileinstruction to the same file when the terminating instruction has the proper B0 override character.FormatOperation —GN — Specifies additional number of sectors to be read as follows:Additional Sectors 0 1 2 3 4 5 6 7 8 9First File 0 1 2 3 4 5 6 7 8 9Second File & A B C D E F G H IA Address — Address of HSM location to receive the first character read from the Data Disc File. This addressmust be an even number (left-hand end of a diad).B Address — B0 designates first sector to be read:First Sector to be Read 0 1 2 3 4 5 6 7 8 9Will Not Ov erride Any DDFSimultaneous Instruction 0 1 2 3 4 5 6 7 8 9Will Ov erride Any DDFSimultaneous Instruction & A B C D E F G H IBu B2, B3 — specify zone from which data is to be read:Module Zone1 000 to 1072 108 to 2153 216 to 3234 324 to 431Direction of OperationLeft to right in HSM.Outline of OperationInitially this instruction is staticized in the Normal Mode. If the Simultaneous Mode is free and the SMDI buttonis not on, the contents of the NOR, N, A and B Registers are transferred to the SOR, M, S, T Registers respectively,and this instruction is executed in the Simultaneous Mode. A start signal is sent to the Data Disc File. The contentsof the sector, as specified by the T Register are transferred to the Data Disc File Buffer, and when the Normal Modeis interruptable, from the buffer to the HSM location designated by the S Register. Transfer is accomplished twocharacters at a time, with the contents of the S Register being increased by two after each pair of characters istransferred. When the additional number of sectors has been read, according to the N character, the operationterminates.The operation may also be terminated by another Data Disc File instruction to the same file when the B0character of the overriding instruction ranges from to "I" as specified above.XII-6 |
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