Serin serout problem

[skimask]

yes the positive values works just fine,
I dont why you are doing 2,s compliment twice in the zerotemp.
I saw that program , but there was too many things I did not understand, like this line:
Dummy = 625 * R_Temp ' Multiply to load internal registers with 32-bit value

Why multiply by 625..

end

I'm not doing the 2's compliment twice, the first one is commented out, the 2nd is for the + case, the 3rd is for the - case. It won't get done more than once.

Do you have your PBP manual handy by chance?
I'm still looking at the rest of your code in your last post, I wanna show you some stuff about 32 bit math in the PBP manual that might help.