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发布时间：2006-06-26 23:26     点击：

        name    free

        page    60,132

        title   'FREE --- Report free space on disk'

; FREE --- a utility to report free space on

;          the default or selected disk drive.

;

; Requires PC-DOS or MS-DOS 2.0.

;

; Used in the form:

; A> FREE  [unit:]

; (item in square brackets is optional)

;

; version 1.0   July 4, 1984

; Copyright (c) 1984 by Ray Duncan

; May be freely reproduced for non-commercial use.

cr      equ     0dh             ;ASCII carriage return

lf      equ     0ah             ;ASCII line feed

blank equ 20h  ;ASCII space code

eom equ '$'  ;end of string marker

; Here we define a dummy segment containing labels

; for the default file control block and the command tail buffer,

; so that the main program can access those locations.

;

psp segment para public 'PSP' 

org 05ch

fcb label byte  ;default file control block

org 080h

command label byte  ;default command buffer

psp ends

cseg segment para public 'CODE'

assume cs:cseg,ds:psp,es:data,ss:stack

get_drive proc near  ;get drive selection, if any,

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