Control Data 3100 Reference Manual page 205

REPLACE - When used in the title of an instruction, the result of the execution of the
instruction is stored in the location from which the initial operand was obtained.
When replace is used in the description of an instruction, the contents of a location
or register are substituted by the operand. The Replace operation implies clearing the
register or portion of the register in preparation for the new quantity.
REPL Y - A response signal in 110 operations that indicates a positive response to some
previous operation or request signal.
RETURN JUMP - An instruction that jumps from a sequence of instructions to initiate
a second sequence and prepares for continuing the first sequence after the second is
completed.
ROUTINE - The sequence of operations which the computer performs, also called a
program.
SCALE FACTOR-One or more coefticients by which quantities are multiplied or
divided so that they lie in a given range of magnitude.
S REGISTER-The 13-bit S register displays the address of the word.
SHIFT - To move the bits of a quantity right or left.
SIGN BIT - In registers where a quantity is treated as signed by use of one's comple-
ment notation, the bit in the highest order stage of the register. If the bit is "1", the
quantity is negative; if the bit is
"0",
the quantity is positive.
SIGN EXTENSION - The duplication of the sign bit in the higher order stages of a
register.
SOFTWARE - Programs and/or subroutines.
SOURCE LANGUAGE - The language used by the programmer to define his program.
STAGE - The FFs and inverters associated with a bit position of a register.
STATUS-The state or condition of circuits within the processor, 110 channels, or
external equipment.
STORE - To transmit information to a device from which the unaltered information can
later be obtained. The Store operation is essentially the reverse of the Load opera-
tion. Storage location M is cleared, and the contents of the register are copied into M.
SUBROUTINE - A set of instructions that is used at more than one point in program
operation.
SYMBOLIC CODING-A system of abbreviation used in preparing information for
input into a computer; e.g., Shift Q would be SHQ.
TOGGLE-To complement each specified bit of a quantity, i,e.: "I" to
"0"
or
"0"
to "I".
TRANSMIT (Transfer) - The term transfer implies register contents are moved; i.e.,
the contents of register 1 are copied into register 2. Unless specifically stated, the
contents are not changed during transmission. The term transmit is often used
synonymously with transfer.
TWO'S COMPLEMENT-Number that results from subtracting each bit of a number
from "0". The two's complement may be formed by complementing each bit of the
given number and then adding one to the result, performing the required carries.
UNDERFLOW - An illegal change of sign from - to
+,
e.g., subtracting from a quantity
such that the result would be less than -
(2n-I),
where n is the modulus. In floating
point notation, this occurs where the value of the exponent becomes less than
2
-10
+
1 (- 17778).
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