But this may be the correct one. I seem to have both listed as 74F582 B2 1+--v--+24 Vcc !A/S 2| |23 NC !A/S = add/subtract B3 3| |22 B1 C/!B = carry/borrow A3 4| |21 A2 C/!B 5| |20 A1 F=A +/- B !G 6| |19 A0 !P 7| |18 B0 C/!Bn+4 8| |17 F0 NC 9| |16 F1 A=B 10| |15 NC NC 11| |14 F3 GND 12+-----+13 F2 Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________