🚀 go-pugleaf

somebody writes:
JA>void PutBlock( int x, int y, int height, int width, char far * buffer )
add to arg list: unsigned far *table
table will point to a table of multiples of 320.  ex. 0,320,640,960,...
  >{   _asm {
  >        push    di
  >        push    si
  >        push    es
  >        push    ds
  >        mov     ax, 320                 <<<-- change this to mov bx, y
  >        mul     y       ; AX = y * 320  <<<-- and this to add bx, bx
	then set ds, si for the table lookup by:  lds si, table

        then load ax with screen addr by          mov ax, ds:[si+bx]
  >        add     ax, x   ;             + x
  >        mov     di, ax  ; ES:DI = destination of pixels
  >        mov     ax, 0A000h
  >        mov     es, ax  ; Segment of VGA memory
            .....
by making these changes you'll probably be saving at least 70 clock cycles,
the table can also be used for get_dot, or plot_dot any other graphics 
routine that addresses the screen.