hardware multiply/divide functionality in CPUs

Brent Hilpert hilpert at cs.ubc.ca
Tue Mar 8 19:55:47 CST 2011


On 2011 Mar 8, at 5:00 PM, Chuck Guzis wrote:
> On 8 Mar 2011 at 16:53, Brent Hilpert wrote:
>
>> I wonder if you have a later printing of Volume II than I have here. I
>> do see near the beginning it states the 9440 implements only 'the LCD
>> of Nova features', but on page 17-20 in the instruction table there
>> are X's for the M/D instructions in the 9440 column. On page 17-15 it
>> says X in the column indicates the instruction is present. The stack
>> operations listed next have no X, indicating they are missing on the
>> 9440.
>
> I'm working from the June, 1977 edition. In this one, it's on page 17-
> 44 and there are no "x" marks in the 9440 column for MPY and DIV.
>
Interesting, Copyright 1976 edition here, no other printing dates. 
There is no page 17-44 in this edition.

I guess somebody observed an error in this edition and corrected it, or 
perhaps Fairchild's preliminary design hope didn't make it to 
production.

A little arcania..




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