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DISKCOPY.ASM
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DISKCOPY.ASM
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TITLE DISKCOPY MSDOS Disk Copier
;----------------------------------------------------------
;
; Diskcopy - Program to copy entire diskettes
;
; Copyright 1982 by Microsoft Corporation
; Written by Chris Peters, August 1982
;
;-----------------------------------------------------------
;
; Rev 1.00 Initial instance
; Rev 1.20
; Read in > 64K hunks
FALSE EQU 0
TRUE EQU NOT FALSE
bdos equ 21h
boot equ 20h
aread equ 25h
awrite equ 26h
INCLUDE DOSSYM.ASM
fcb equ 5ch
CODE SEGMENT PUBLIC
CODE ENDS
CONST SEGMENT PUBLIC BYTE
CONST ENDS
DATA SEGMENT PUBLIC BYTE
DATA ENDS
DG GROUP CODE,CONST,DATA
CODE segment PUBLIC
assume cs:DG,ds:DG,es:DG,ss:DG
EXTRN dskrd:NEAR,dskwrt:NEAR,promptyn:NEAR
PUBLIC PRINT,PCRLF,ASKANOTHER,sec64k,secsiz
org 100h
diskcopy:
jmp disk_entry
HEADER DB "Vers 1.20"
source db 0
dest db 0
count dw 0
start dw 0
secsiz dw 0
passcnt dw 0
sec64k dw 0
media db 0
buffer dw 0
bufsiz dw 0
pcrlf: mov dx,OFFSET DG: crlf
print: mov ah,STD_CON_STRING_OUTPUT
int bdos
pret: ret
getkey: mov dx,OFFSET DG: keymsg
call print
mov ah,12 ;wait for key press
mov al,1
int 21h
ret
;
; returns number of sectors on the disk in cx, sector size in ax
;
getdpb: push ds
inc dl
mov ah,GET_DPB
int bdos
mov al,[bx+dpb_cluster_mask]
cbw
inc ax
mov cx,[bx+dpb_max_cluster]
dec cx
mul cx
add ax,[bx+dpb_first_sector]
mov cx,[bx+dpb_sector_size]
mov bl,[bx+dpb_media]
pop ds
ret
getdrv: mov al,[bx]
dec al
cmp al,-1
jnz get1
mov ah,19h
int 21h
get1: ret
;
; set zero flag if drives the same
;
compare:push ax
mov al,[dest]
cmp al,[source]
pop ax
ret
printerr:
call print
int boot
disk_entry:
cli ;set up local stack
mov sp,100h
sti
;Code to print header
; PUSH AX
; MOV DX,OFFSET DG: HEADER
; CALL print
; POP AX
mov dx,OFFSET DG: drverr1
inc al
jz printerr
inc ah
jz printerr
mov bx,fcb
call getdrv
mov [source],al
add [srclet],al
mov bx,fcb+16
call getdrv
mov [dest],al
add [dstlet],al
add [fdstlet],al
mov ah,DISK_RESET
int bdos ;empty buffer queue
mov bx,OFFSET DG:progsiz + 15
shr bx,1
shr bx,1
shr bx,1
shr bx,1
mov ah,setblock
int 21h ;give back extra memory
mov bx,0FFFFh ;ask for Biggest hunk
mov ah,alloc
int 21h
jnc gotmem
mov ah,alloc
int 21h
gotmem:
mov [buffer],ax
mov [bufsiz],bx
copyagn:
mov [start],0 ;Initialize start sector
call compare
jz onedrv1
mov dx,OFFSET DG: srcmsg
call print
onedrv1:mov dx,OFFSET DG: fdstmsg
call print
call getkey
mov dl,[dest]
call getdpb
mov [count],ax
mov [secsiz],cx
mov [media],bl
call compare
jnz twodrv1
mov dx,OFFSET DG: srcmsg
call print
call getkey
twodrv1:mov dl,[source]
call getdpb
mov dx,OFFSET DG: drverr3
cmp [media],bl ;make sure media and sizes match
jnz errv
cmp [count],ax
jz sizeok
errv: jmp printerr
sizeok:
mov bx,[secsiz]
add bx,15
mov cl,4
shr bx,cl
xor dx,dx
mov ax,1000H
div bx
mov [sec64k],ax ;set number of sectors in 64K bytes
xor dx,dx
mov ax,[bufsiz]
div bx
mov [passcnt],ax ;set number of sectors per pass
call compare ;print copying....
jz loop
mov dx,OFFSET DG: cpymsg
call print
loop: push ds
mov al,[source]
xor bx,bx
mov cx,[passcnt]
cmp cx,[count]
jbe countok
mov cx,[count]
countok:mov dx,[start]
mov ds,[buffer]
call dskrd
pop ds
push ds
push cx
call compare
jnz twodrv2
mov dx,OFFSET DG: dstmsg
call print
call getkey
twodrv2:mov al,[dest]
xor bx,bx
mov dx,[start]
mov ds,[buffer]
call dskwrt
pop cx
pop ds
add [start],cx
sub [count],cx
jbe quitcopy
call compare
jnz loop
mov dx,OFFSET DG: srcmsg
call print
call getkey
jmp loop
quitcopy:
mov ah,DISK_RESET
int bdos ;empty buffer queue
mov dx,OFFSET DG: goodmsg
call compare
jnz twodrv3
mov dx,OFFSET DG: good1
ASKANOTHER:
twodrv3:call print
mov dx,OFFSET DG:anoprompt
call promptyn
jnz alldone
jmp copyagn
alldone:
int boot ;home, james...
CODE ENDS
CONST SEGMENT PUBLIC BYTE
EXTRN fdstmsg:BYTE,dstmsg:BYTE,fdstlet:BYTE,dstlet:BYTE
EXTRN cpymsg:BYTE,good1:BYTE,goodmsg:BYTE,srcmsg:BYTE,srclet:BYTE
EXTRN keymsg:BYTE,drverr1:BYTE,drverr3:BYTE,crlf:BYTE
EXTRN anoprompt:BYTE
db ' MICROSOFT - PETERS '
CONST ENDS
DATA SEGMENT BYTE
progsiz LABEL BYTE
DATA ends
end diskcopy