Roku

Hi,

I am having a hard time writing to a file from a TSR routine. The routine is supposed to write a line of text to a file when the F9 key is pressed. Instead it just prints the line to the screen. I am only posting the parts of the routine I having problems with. I thikn I setup the IVT table correctly.

Thanks,
Kevin

; --------------------------------------------------
; Example layout for interrupt handler.

.model tiny
.486
text segment public 'CODE'

; Note, must put start of program at 100 hex,

org 100h
start:
jmp init

; note, required to "start" just past the "org",
; so jump, not call, since we will not return.

myint proc far
pushf
call CS:oldn

push ax
push bx
push cx
push dx
push ds
push es

mov ax,cs
mov ds,ax

; Check for F9 down
cmp ax, 43h
je no_err

; Check for F9 up, file write
cmp ax, 0c3h
je filewrite

; If we see any other key, just beep
jmp err

; write the stars line to the file
filewrite:
mov ah, 40h
mov bx, es:fhand
mov cx, 82
lea dx, es:stars
int 21h
jc err

; Commit the line
mov ah, 68h
mov bx, es:fhand
int 21h
jmp no_err