Post by thread:Frank Testa (was: "Re: CODE formatting....")

Scott Dattalo <spam_OUTsdattaloTakeThisOuTunix.sri.com> wrote: > > movf (bbb), w > > skpnc > > incfsz (bbb), w > > addwf (aaa), f > > And as Bob F. and I were recently discussing, this comes from > Microchip's AN617. The author is Frank Testa. Scott & Bob: I'd also be inclined to believe that Frank Testa was the first to use that implementation... His use is the earliest reference I've seen. Of course, others among us have discovered it independently. Testa also pointed out -- and I only learned about this in 1994, so he knew about it earlier -- that, with a minor modification, the code works for valid-carry two-byte SUBTRACTION, too: MOVF SOURCELO,W SUBWF DESTLO MOVF SOURCEHI,W SKPC INCFSZ SOURCEHI,W SUBWF DESTHI Note that the Z flag is invalid at the conclusion of the suhtraction. -Andy Andrew Warren - .....fastfwdKILLspam@spam@ix.netcom.com Fast Forward Engineering, Vista, California http://www.geocities.com/SiliconValley/2499