Assembly Math

Question 1

CTC

Answer 1

clear carry flag

Question 2

STC

Answer 2

set carry flag

Question 3

CMC

Answer 3

flip carry flag

Question 4

ADC

Answer 4

Adds two values and adds 1 if carry flag is set.

Question 5

SBB

Answer 5

Subtracts two values and subtracts an additional one if carry flag if carry flag is set.

Question 6

OF and CF

Answer 6

Both set to 1 if upper half of a multiplication is non-zero. For example, if AL is multiplied by an 8-bit number and the result extends up into AH, both flags set. If EAX is multiplied by a 32 bit number and extends into EDX for overflow, both bits are set.