i don't do graphics... too much work vs outcome to motivate me. heres how you could do it using get and put, but this very very rough, and gets garbles after a little while.
this writes some random 1s and 0s to the screen, captures two vertical rectangles using GET quickly before you can see it. then you specify a startpoint for the upper left corner of the rectangle, put the rectangle there, and increase that point downward for a random interval.
the first challenge you would have with this is, one, you would need to PUT the sequences in increments(both x and y) and dimension the GET rectangle just right so wherever a sequence stopped it would not clash with a sequence which was put there previously..you can see where i took a random stab at this with the MOD and STEP statements...
the next challenge you'd have is PUTing enough sequences on the screen. not that this is too difficult conceptually but the GET and PUT statements aren't too obliging in allowing you to be flexible with arrays.
another challenge is the fact that (with what little I know about PUT) - you can't PUT off the screen. That's the reason for the ON ERROR RESUME NEXT, and you'll see that when some sequences blink that's when there was an error.
SCREEN 12
COLOR 2
RANDOMIZE 609
ON ERROR RESUME NEXT
DIM Matrix(1 TO 800)
DIM Matrix2(1 TO 400)
FOR y = 1 TO 25
FOR x = 1 TO 80
a = RND
a = INT(a * 2)
IF a = 0 THEN f$ = "0"
IF a = 1 THEN f$ = "1"
LOCATE y, x
PRINT f$;
NEXT x
NEXT y
GET (8, 15)-(15, 256), Matrix
GET (31, 15)-(39, 125), Matrix2
CLS
DO
x = RND
x = INT(x * 90) + 1
x = x * 8
IF x MOD 2 <> 0 THEN x = x + 1
b = RND
b = INT(b * 16) + 1
b = b * 14
IF b MOD 2 <> 0 THEN b = b + 1
FOR y = 1 TO b STEP 14
PUT (x, y), Matrix, PSET
PUT (x + 49, y - 13), Matrix, PSET
PUT (x - 49, y + 13), Matrix2, PSET
PUT (x, y), Matrix, XOR
PUT (x + 49, y - 13), Matrix, XOR
PUT (x - 49, y + 13), Matrix2, XOR
f = 0
NEXT y
h = RND
h = INT(h * 3)
SELECT CASE h
CASE 0: PUT (x, y), Matrix
CASE 1: PUT (x + 49, y - 13), Matrix
CASE 2: PUT (x - 49, y + 13), Matrix2
END SELECT
LOOP