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2. Carry (arithmetic) - Wikipedia

   en.wikipedia.org/wiki/Carry_(arithmetic)

   A typical example of carry is in the following pencil-and-paper addition: 1 27 + 59 ---- 86 7 + 9 = 16, and the digit 1 is the carry. The opposite is a borrow, as in −1 47 − 19 ---- 28 Here, 7 − 9 = −2, so try (10 − 9) + 7 = 8, and the 10 is got by taking ("borrowing") 1 from the next digit to the left. There are two ways in which ...

3. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Elementary arithmetic is a branch of mathematics involving addition, subtraction, multiplication, and division. Due to its low level of abstraction, broad range of application, and position as the foundation of all mathematics, elementary arithmetic is generally the first branch of mathematics taught in schools. [1] [2]

4. Arithmetic logic unit - Wikipedia

   en.wikipedia.org/wiki/Arithmetic_logic_unit

   Subtract with borrow: B is subtracted from A (or vice versa) with borrow (carry-in) and the difference appears at Y and carry-out (borrow out). Two's complement: A (or B) is subtracted from zero and the difference appears at Y. Increment: A (or B) is increased by one and the resulting value appears at Y.

5. Intel BCD opcodes - Wikipedia

   en.wikipedia.org/wiki/Intel_BCD_opcodes

   The processor will set the adjust flag if a borrow occurred in the least significant nibble, and the carry flag if a borrow occurred in the most significant nibble. Packed The result is adjusted using das (decimal adjust after subtraction): If the least significant nibble of the result is 10 or higher, or if the adjust flag is set, then the ...

6. Half-carry flag - Wikipedia

   en.wikipedia.org/wiki/Half-carry_flag

   The Auxiliary Carry flag is set (to 1) if during an "add" operation there is a carry from the low nibble (lowest four bits) to the high nibble (upper four bits), or a borrow from the high nibble to the low nibble, in the low-order 8-bit portion, during a subtraction. Otherwise, if no such carry or borrow occurs, the flag is cleared or "reset ...

7. Carry flag - Wikipedia

   en.wikipedia.org/wiki/Carry_flag

   The carry flag is set according to this addition, and subtract with carry computes a+not(b)+C, while subtract without carry acts as if the carry bit were set. The result is that the carry bit is set if a≥b, and clear if a<b. The System/360, [3] ARM, POWER/PowerPC, 6502, MSP430, COP8, Am29000, i960, and 88000 processors use this convention.