I'm not sure what is going wrong with my program. When I assemble and run it as a com file, I get the error Required Parameter Missing.
When I try to debug to see if the carry flag is set for some reason I see that it does cmp ah, 4b and then jumps if zero. Code is below:
Again my goal is to copy everything from c:\Read\readme.dat and to c:\Read\output.dat
copy segment 'code'
org 100h
assume cs:copy, ds:copy
Start: Jmp RealStart
inh dw ?
outh dw ?
buffsize equ 100
inname db 'C:\Read\readme.dat',0
outname db 'C:\Read\output.dat',0
buffer db buffsize dup(?)
;------------------open inname
RealStart:
mov ax, 3d00h
mov dx, offset inname
int 21h
jc error
mov inh, ax
mov ah, 3ch ;----Creates output
sub cx, cx
mov dx, offset outname
int 21h
jc error
mov outh, ax
;--------- copy data
again:
mov ah, 3Fh
mov bx, inh
mov cx, buffsize
mov dx, offset buffer
int 21h
jc error
or ax, ax
jz done
mov bx, outh
mov cx, ax
mov ah, 40h
mov dx, offset buffer
int 21h
jc error
or ax,ax
jz error
jmp again
;---------
done:
mov ah, 3eh
mov bx, inh
int 21h
mov ah, 3eh
mov bx, outh
int 21h
error:
int 20h
copy ends
end Start