In a message dated 10/17/98 8:00:49 PM Eastern Daylight Time, rabidcow@juno.com writes: > why not: > > add hl,de ;what you said > adc a,b ;automatically inc if carry! > > ??? > because i didn't think of it :) i've never really understood adc and sbc. from this post, i'm inferring that it add's the carry as the value 0000000c, so it's either 1 or 0. i wasn't sure if this was that 9 bit arithmetic stuff or whatever.