[daip] blanking in COMB

[gtaylor]

Hi All,

   When using opcode 'OPTD', COMB seems to be testing the value of 

MAP(1) and MAP(2)

and if either are negative, blanking it.  This isn't correct.  What it
should be (and from looking at the code does seem to be) testing is:

(A(3)*MAP(1)/MAP(2) + A(4)) 

which is the expression inside the logarithm.  I've managed to work around
this, but it took me about an hour to figure out what was going on.
Ciao,
                                             - Greg