Halve (Her) (Hdr) - RCA 70/46 Reference Manual

Halve
(HER) (HDR)
General Description
Format
(RR Short)
(RR Long)
Condition Code
Interrupt Action
Floating-Point Instructions
• The operand in the floating-point register specified by the second address
(R
2 )
is divided by two. The quotient is loaded into the floating-point register
specified by the first address (R
1 ) .
(HER) 34
Rl
~
0 7 8 11
12 16
(HDR) 24
Rl R2
0 7
8 11
12 16
•
Unchanged.
•
Address error:
Specification.
Notes •
1. The difference between the Halve instruction and a Divide instruction
with a divisor of two, is that no normalization and no zero mantissa
testing takes place. The sign and exponent are unaltered and the
mantissa is shifted right one bit.
2. Short operands do not alter the low-order half of the result register.
216