; CIS-261 Lab exercise M09
; M09_prototype.asm
; Program that beeps
;

.386                ; Tells MASM to use Intel 80386 instruction set.
.MODEL FLAT         ; Flat memory model
option casemap:none ; Treat labels as case-sensitive

EXTERN _Beep@8:NEAR     ; takes 2 DWORD parameters
EXTERN _Sleep@4:NEAR    ; takes 1 DWORD parameter

.CONST          ; Constant data segment

.DATA           ; Begin initialised data segment

.CODE           ; Begin code segment
_main PROC      ; Main entry point into program

    ; __stdcall calling convention: args pushed R to L
    
    mov     eax, 500    ; duration, milliseconds
    push    eax
    mov     eax, 1000   ; frequency, Hertz
    push    eax
    call    _Beep@8     ; Beep( frequency, duration );

    mov     eax, 500    ; sleep time in milliseconds
    push    eax         ; param on the stack
    call    _Sleep@4
    
    ret
_main ENDP

END _main   ; Marks the end of the module and sets the program entry point label