8 bit adder and 8 bit subtractor help...

hello guys....i am stuck on this part...all i need is a 8bit adder and a 8bit subtractor(2s complement) on one multisim design... how do i connect the NOT gate outputs to the adder in such a way that i can switch to either adder mode or subtractor mode...sorry i am new to this...help will be appreciated.Thanks(File uploaded)
Attachments:
Design2.zip ‏329 KB

Hi jonboy:
Welcome to discussions!
iMovie needs 48KHz/16-bit audio. Anything else will cause you problems.
is it possible for you to send the original footage to a DV Camera set to 16-bit audio and then re-import to iMovie?
Sue

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