RCA 301 Programmer's Reference Manual
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1 Card Read Simultaneous (CRS)General DescriptionThis instruction reads information from punched cards in the Read Unit of the Card Reader-Punch into theHSM using the Simultaneous Mode.FormatOperation — 1Symbol ResultK1Binary read mode specifiedTranslate read mode specifiedA Address — Address of HSM location to receive the first character read from punched cards.B Address — Must be zeros (0000).Direction of OperationLeft to right.Outline of OperationThis instruction is initially staticized in the Normal Mode. If the Simultaneous Mode is free and the SMDIbutton is not on, the contents of the NOR Register are transferred to the SOR Register and the contents of the A andB Registers are transferred to the S and T Registers, respectively.This instruction operates in the Simultaneous Mode. This instruction directs the Card Reader Unit to place acard in the read station and operates on successive characters in the following cycle:When the translate read mode has been specified (N =1), the character in column one of the punched card isautomatically translated from RCA card code to RCA 301 code and is placed in HSM in the location specified bythe S Register. The following 79 characters are placed in successive locations in HSM. The final character (column80) is located at (S)j + 79.When the binary read mode has been specified (N = K), each card column is split into two groups of six bitseach, a parity bit is generated and added to each group, and the resultant two characters are transferred into HSM.The character represented by rows 9 through 4 in column 1 (row 9 = 2s, row 4 = 2°) is read into HSM at thelocation specified by the S Register. Successive characters representing rows 9 through 4 are also read into memorywith column 80 being placed at (S)j + 79. The character represented by column 1, rows 3 through Y (row 3 = 25,row Y = 2") is read into HSM at (S)| + 80. Successive characters representing rows 3 through Y are likewise readinto HSM with column 80 being placed at (S)j + 159. The final S Register setting is (S)j + 160.A card read instruction must be staticized for each card read. In order to maintain an 800 card per minute rate,successive Card Read instructions must be staticized before 75 milliseconds have elapsed. The 75 millisecond cardcycle includes 21 milliseconds card feed access time, 44 milliseconds card read time, and 10 milliseconds free time.The Simultaneous Mode interrupts the Normal Mode 13.44 milliseconds during the 44 milliseconds card read time.Final Register Contents(S)f = One location to the right of the last character read into HSM.(T)r = (A) j when N = 1 (Translate Read Mode).(T)f = (A)s + 80 when N = K (Binary Read Mode).VIII-12 |
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