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Statements

Subject Item
dbr:Adjust_flag
rdf:type
dbo:Album owl:Thing
rdfs:label
Adjust flag
rdfs:comment
The Adjust flag (AF) is a CPU flag in the FLAGS register of all x86-compatible CPUs, and the preceding 8080-family; it is also called the Auxiliary flag and the Auxiliary Carry flag (AC, though this may be confused with the Alignment Check register). The flag bit is located at position 4 in the CPU flag register. It indicates when an arithmetic carry or borrow has been generated out of the four least significant bits, or lower nibble. It is primarily used to support binary-coded decimal (BCD) arithmetic.
rdfs:seeAlso
dbr:FLAGS_register
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dbc:Computer_arithmetic dbc:Binary_arithmetic dbc:X86_architecture
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20865950
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993615973
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dbr:Carry_(arithmetic) dbr:Status_register dbr:Carry_flag dbc:Computer_arithmetic dbr:Arithmetic dbc:X86_architecture dbr:Sign_flag dbr:Trap_flag dbr:Overflow_flag dbr:Zero_flag dbr:Bit_position dbr:Half-carry_flag dbr:Intel_BCD_opcode dbr:CPU dbc:Binary_arithmetic dbr:Parity_flag dbr:X86 dbr:Intel_8080 dbr:Direction_flag dbr:Interrupt_flag dbr:FLAGS_register dbr:Binary-coded_decimal
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dbo:abstract
The Adjust flag (AF) is a CPU flag in the FLAGS register of all x86-compatible CPUs, and the preceding 8080-family; it is also called the Auxiliary flag and the Auxiliary Carry flag (AC, though this may be confused with the Alignment Check register). The flag bit is located at position 4 in the CPU flag register. It indicates when an arithmetic carry or borrow has been generated out of the four least significant bits, or lower nibble. It is primarily used to support binary-coded decimal (BCD) arithmetic. The Auxiliary 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" (set to 0).
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dbr:Flag
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