Boot.asm의 segment define 부분 해석 부탁드립니다.

StdBase equ 7c00h ; address where DOS loads us
Base equ 600h ; address where we rewrite itself

; -------------------------------

dummy segment at 0
assume cs:dummy
org Base ; address where we rewrite itself
BaseEntry:
org StdBase ; address where DOS loads us
StdBaseEntry:
dummy ends