8 Mar
2011
8 Mar
'11
4:53 p.m.
On 2011 Mar 8, at 4:14 PM, Chuck Guzis wrote:
On 8 Mar 2011 at 15:33, 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.
You say the 9440 doesn't have M/D, the book
does explicitly indicate
they are present for the 9440 .. the book is in error?
Apparently. Take a look at Volume II's instruction set description.
The MPY and DIV are listed as not being on the 9440. (They are on the
later 9445). Osborne's book indicates that the 9440 supported the
"basic" Nova 800 set of instructions and features. I take that to mean the features present on a
"basic" Nova 800. On
those, the DIV and MUL instructions were an option, so it's
reasonable to speculate that the 9440 didn't have them.
We could decide with some certainty if a 9440 datasheet could be
found.