snow - random

gistfile1.asm

get_random:
        ; start out with ax and bx = 0
	xor	ax, ax
	xor     bx, bx
	
        ; get the first random number and
        ; store it off in bl
	mov	dx, 40h
	in	al, dx
	mov	bl, al

        ; get the second random number and
        ; store it off in al, but we only 
        ; want 6 bits of this number
	mov	dx, 40h
	in	al, dx
	and     al, 63
	
        ; add the two numbers to produce a
        ; random digit in range
	add	ax, bx
	
	ret