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The 8 least significant bits always stored in the register would be 11111110 binary (254 decimal) but since there is carry out of bit 7 (the eight bit), the carry is set, indicating that the result needs 9 bits. The valid 9-bit result is the concatenation of the carry flag with the result.
The carry, parity, auxiliary carry (or half carry), zero and sign flags are included in many architectures (many modern (RISC) architectures do not have flags, such as carry, and even if they do use flags, then half carry is rare, since BCD math no longer common, and it even has limited support on long mode on x86-64).
the carry flag uses a "borrow bit" convention for subtracts, rather than the "carry bit" convention used by Microchip; they also include a signed overflow flag, which like the digit carry, is set by add, subtract and compare instructions (every instruction which sets the carry flag except for shift instructions);
Most computers have two dedicated processor flags to check for overflow conditions. The carry flag is set when the result of an addition or subtraction, considering the operands and result as unsigned numbers, does not fit in the given number of bits. This indicates an overflow with a carry or borrow from the most significant bit.
Add-with-carry, with the overflow-flag EFLAGS.OF serving as carry input and output, with other flags left unchanged. SMAP Supervisor Mode Access Prevention. Repurposes the EFLAGS.AC (alignment check) flag to a flag that prevents access to user-mode memory while in ring 0, 1 or 2. CLAC: NP 0F 01 CA: Clear EFLAGS.AC. 0 Broadwell, Goldmont, Zen 1 ...
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Rotate through carry is a variant of the rotate operation, where the bit that is shifted in (on either end) is the old value of the carry flag, and the bit that is shifted out (on the other end) becomes the new value of the carry flag. A single rotate through carry can simulate a logical or arithmetic shift of one position by setting up the ...
US Postal Service employees work inside the Los Angeles Mail Processing & Distribution Center on December 3. The facility is currently processing 1 million packages per day.