This flag is used to determine the direction ('forward' or 'backward') in which several bytes of data will be copied from one place in the memory, to another. The direction is important mainly when the original data position in memory and the target data position overlap.

Oct 20, 2022 · The direction flag is a CPU flag specific to all Intel x86-compatible CPUs. It applies to all assembly instructions that use the REP (repeat) prefix, such as MOVS , MOVSD , MOVSW , and others. Addresses provided to applicable instructions are increased if …

Mar 9, 2012 · The direction flag is used to influence the direction in which string instructions offset pointer registers. These are the same instructions that can be used with the REP prefix to repeat the operation.

Apr 30, 2012 · This flag is used in string operations, and specifies if strings begin at a low address and proceed to higher addresses or vice versa. For string instructions, ECX has the number of iterations, DS:ESI has the source address and ES:EDI …

Sep 23, 2024 · Flags in the 8086 processor are divided into two primary types: Direction Flag (DF): decides on the direction of string operations , it can vary from forwards to backwards. Trap Flag (TF): may help in debugging one instruction at a time by turning on single step mode. Interrupt Flag (IF): that can turn ON or OFF maskable interrupts.

The “backwards” flag is actually part of the US Flag Code, which applies to spacecraft, aircraft, and even service members’ uniform insignia. According to United States Army regulations, “The full-color US flag cloth replica is worn so that the star field faces forward, or …

Jun 22, 2018 · The truth is that only those American flag patches worn on the right shoulder appear reversed; on the left shoulder, the patch appears in its usual, accepted position (blue field in the upper left). The simple reason for this is that …

Feb 7, 2023 · The flag will be facing the opposite direction from the one you’re moving in as the wind catches it, making it into a reverse side flag. That’s what the reversed military flag patch is intended to represent.

The United States Flag Code establishes advisory rules for display and care of the flag of the United States. It is Section 1 of Title 4 of the United States Code (4 U.S.C. § 1 et seq ). This etiquette is as applied within U.S. jurisdiction.

May 31, 2014 · If the direction flag happens to be set when the bootloader transfers control to your code, string operations won't work the way you expect. Most well-behaved bootloaders probably won't do this, but it's good practice to be sure.