RCA 301 Programmer's Reference Manual
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5 Tape Read Forward Simultaneous (RFS)General DescriptionThis instruction brings a series of consecutive characters from magnetic tape or punched paper tape into theHSM. Transfer from tape begins with the first character following a gap and ends when the next gap is sensed orthe specific HSM area is filled. When rdhding gapless paper tape, transfer begins with the first character and endswhen the specified HSM area is filled or a gap is sensed. This instruction is performed in the Simultaneous Mode.FormatOperation — 5N — Identification character of Tape Station, Paper Tape Reader, or Interrogating Typewriter. (SeeAppendix G.)A Address — Address of location in HSM which is to receive the first character read.B Address — Address of location in HSM which is to receive the last character read.Direction of OperationLeft to tight.Direction of Tape MotionForwardOutline of OperationInitially this instruction is staticized in the Normal Mode. If the Simultaneous Mode is free and the SMDIbutton is not on, the contents of the NOR, N, A, and B Registers are transferred to the SOR, M, S, and T Registersrespectively, and this instruction is executed in the Simultaneous Mode. This instruction sends a start signal to theinput unit specified by the contents of the M Register. The first character following a gap on tape or the nextcharacter on gapless paper tape is placed in the tape buffer, and this instruction operates in the following cycle:When reading other than 66 KC tape, the character in the input buffer is transferred to the HSM location specifiedby the S Register. The contents of the S Register are compared with the contents of the T Register. The contentsof the S Register are incremented by one. If a gap is passed in sequence, the instruction terminates. If the comparisonproved equal and a gap is not passed, the instruction terminates, and tape movement continues to gap. If thecomparison proved not equal and a gap is not passed, the cycle is repeated.When reading 66 KC magnetic tape two characters are transferred from tape to the input buffer and then toHSM, and the S Register is incremented by two. Otherwise, the instruction operates as stated above.If an EF or ED alone is read from magnetic tape, the EF/ED Simultaneous Indicator is set. The EF/EDSimultaneous Indicator is not set when reading from paper tape. If SMDI is set, the EF/ED Normal Indicator willbe set.Final Register Contents(S)f = One location to the right of the last character read into HSM.(T)t = (B),TimingHi-Data tapes, Model 381, are read at the rate of 10 KC.Hi-Data tapes, Model 382, are read at the rate of 30 KC.Paper tape is read at the rate of up to 1000 characters per second.The tape station attached to the Tape Adapter or Dual Tape Channel is read at the rate of 33.3 KC if it is aModel 581 Tape Station or 66.7 KC if it is a Model 582 Tape Station.The Interrogating Typewriter prints at a rate up to 10 characters per second.IX-6 |
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