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Double Length Binary Data
There are instructions which perform operation on double length words (36 bits). The numerical
range is increased from (-131,071 to +131,071) to (-34, 353, 367 368 to +34, 359, 738, 367).
These doub1e length words are stored in memory and the registers as below, where M(18),
A(18) is a "two" complement sign. M must be even for all double length instructions.
HIGH
ORDER
SIGN
M
M+l
---------------------------------------------------------------- LOW
___ 1s _____________________________
1~1_1_s
____________________________ 1_1
ORDER
A
B
The branch flip-flops are treated in a special manner by the three double length instructions
(LDD, STD, AMD).
The plus flip-flop is set on A(18). The zero flip-flop is set on the entire
36 bits of the double length result.
The even flip-flop is set on B(l). The sign is programmed.
@&u&~~uCJ
: f i l @ - - - - - - - - - - - -
1.-29
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