清华大学出版社 TSINGHUA UNIVERSITY PRESS code segment main proc far assume code segment start main proc fa push ds assume mov ax. 0 start push ax ret mov ax, 4c00h main endp int 21h code ends end start main endp code ends end start…… code segment main proc far assume …… start: push ds mov ax, 0 push ax …… ret main endp code ends end start …… code segment main proc far assume …… start: …… …… mov ax,4c00h int 21h main endp code ends end start