isascii.mac

这是一个８０８６和８０８８系列机的编译器的源码

 INCLUDE PROLOG.H
_CC1:
 PUBLIC _isascii
_isascii:
 MOV BX,2
 ADD BX,SP
 MOV BX,[BX]
 XCHG DX,BX
 MOV BX,127
 CMP DX,BX
 MOV BX,CX
 JA $+3
 INC BX
 RET
 INCLUDE EPILOG.H
 END