Hi Charles, in the result equaling 256, you have r0 = 00, and r1 = 01. Does this mean that the result has it's high bit starting at r3 and not r0? I ask this because if r0 is the high bit of the quotient, then r0r1r2r3 = 00010000h = 4096d. But if r3 is the high bit, then r3r2r1r0 = 00000100h = 256d. I thought the quotient result was in the order from high to low bit r0r1r2r3, but is it r3r2r1r0? Also, did I place my values for 130,560 and 510 in the right registers? Dr. Marshall has his dividend in r0-r3. Is the high bit starting from r0 or r3? I have the same question for the divisor r4r5. Is the high bit r4 or r5? If it worked for you, maybe I am mixing up the high and low bits of the inputs as well as the result. I hope what I am asking makes sense. Thanks.