TITLE The New DOS

.386p
.model      small,Flat,StdCALL
.stack      100h
OPTION CaseMap:None
.MMX
.XMM


; Set the window variable framework
WINDESC      STRUCT
         upperRow      BYTE   ?
         leftCol         BYTE   ?
         lowerRow      BYTE   ?
         rightCol         BYTE   ?
         foreColor      BYTE   ?
         backColor      BYTE   ?
WINDESC      ENDS

; Not really sure about this one
exit      MACRO
         mov            ax, 4C00h
         int            21h
         ENDM

;set variables
.data
   application   WINDESC         <05h, 05h, 15h, 45h, 07h, 10h>
    msgNoMouseDriver db "no mouse driver",13,10,"$"
    msgPressAnyKey   db "press any key to exit",13,10,"$"
;==============================================================================

    ;-------------------------------------------------------------------
    ; With MASM the mouse driver functions are called with the function
    ; number in AX, and depending on the function, the return values may
    ; be in AX, BX, CX, or DX.
    ;-------------------------------------------------------------------

    ;----------------------------------------------------------------------
    ; Check for a mouse driver. Use the DOS Get Interrupt Vector function
    ; to get the interrupt 33h vector. If the segment address is zero then
    ; the mouse driver is not installed.
    ;----------------------------------------------------------------------

.code

;mouse driver
mouse proc

         mov ax,3533h
         int 21h
         mov ax, es
         .IF ax == 0
            mov ah, 9
            mov dx, OFFSET msgNoMouseDriver
            int 21h
         jmp myExit
.ENDIF

    ;-------------------------------------------------------------------------
    ; Attempt to reset the mouse driver by calling the Mouse Reset And Status
    ; function. If the reset fails, indicated by the function returning zero,
    ; then the mouse driver is not installed.
    ;-------------------------------------------------------------------------

         xor ax, ax
         int 33h
         .IF ax == 0
            mov ah, 9
            mov dx, OFFSET msgNoMouseDriver
            int 21h
            jmp myExit
.ENDIF

    ;------------------------------------------------------------------
    ; Show the mouse cursor by calling the Mouse Show Cursor function.
    ;------------------------------------------------------------------

         mov ax, 1
         int 33h

    ;-----------------------------------------------------------------------
    ; Loop, calling the Mouse Get Button Status And Mouse Position function
    ; until the user presses the left mouse button with the mouse cursor
    ; at character coordinate 0,0 (the first character at the upper-left
    ; corner of screen). The function returns the button status in BX, the
    ; horizontal cursor coordinate in CX, and the vertical cursor coordinate
    ; in DX. The button status for the left mouse button is returned in
    ; bit 0 of BX, and the status for the right mouse button in bit 1, with
    ; the bit set if the button is pressed or cleared if the button is
    ; released. The cursor coordinates are returned as mouse-driver virtual-
    ; screen coordinates, where the virtual screen for most of the display
    ; modes is 640x200. For the 80x25 character (AKA "text") modes you
    ; convert the virtual-screen coordinates to character coordinates by
    ; simply dividing the virtual-screen coordinates by 8.
    ;-----------------------------------------------------------------------

  @@:
         mov ax, 3
         int 33h
         .IF bx & 1        ; left mouse button is pressed
            shr cx, 3
            shr dx, 3
         .IF cx || dx  ; mouse cursor not over character 0,0 so keep looping
            jmp @B
.ENDIF
.ELSE
         jmp @B        ; left mouse button not pressed so keep looping
.ENDIF

myExit:

         mov ah, 9
         mov dx, OFFSET msgPressAnyKey
         int 21h

         xor ah, ah
         int 16h

ret
;.exit
;end
mouse endp

;setting the cursor position
curpos      PROC
         push         bp
         mov            bp, sp
         push         ax
         push         bx
         push         dx

         mov            ax, 0200h
         mov            bh, 0
         mov            dx, [bp+4]
; interrupt
         int            10h

         pop            dx
         pop            bx
         pop            ax
         pop            bp
         ret            2
curpos      ENDP


;still unused
putchar      PROC
         push         bp
         mov            bp, sp
         push         ax
         push         bx
         push         cx
         push         dx


         pop            dx
         pop            cx
         pop            bx
         pop            ax
         pop            bp
         ret            2
putchar      ENDP


getchar      PROC
         mov            ah,00h
         int            16h
         ret
getchar    ENDP

;window construction
makewin      PROC
         push         bp
         mov            bp, sp
         push         ax
         push         bx
         push         cx
         push         dx
         push         si

         mov            si, [bp+4]

         mov            ax, 0600h
         mov            bh, (WINDESC PTR[si]) .backColor
         mov            ch, (WINDESC PTR[si]) .upperRow
         mov            cl, (WINDESC PTR[si]) .leftCol
         mov            dh, (WINDESC PTR[si]) .lowerRow
         mov            dl, (WINDESC PTR[si]) .rightCol
;interrupt
         int            10h

         push         cx
         call         curpos

         pop            si
         pop            dx
         pop            cx
         pop            bx
         pop            ax
         pop            bp
         ret            2
;         jmp   short      main
makewin      ENDP

main      PROC
         mov            ax, @data
         mov            ds, ax

         mov            ax, OFFSET application
         push         ax
         call         makewin
         call         getchar
         exit
main      ENDP

         end            main