Clear Direction flag.
SI and DI will be incremented by chain instructions: CMPSB, CMPSW, LODSB, LODSW, MOVSB, MOVSW, STOSB, STOSW.
Algorithm : DF=0
CLD
CLD ;DF=0
8086 CLC (Clear Carry Flag) - https://wikidev.in/wiki/assembly/8086/CLC
8086 CLI (Clear Interrupt Flag) - https://wikidev.in/wiki/assembly/8086/CLI