Here :)
ACLS
turns off the keyboard
XSCREEN 2
@LOOP
makes it draw to the touch screen
DISPLAY 1
prints the text on the touch screen
LOCATE 10,10:?"WORKS"
slows it down and clears the text
VSYNC 1:CLS
makes it draw to the top screen
DISPLAY 0
GOTO @LOOP
Part 2.
sets the size
BGSCREEN 0,64,64
BGSCREEN 1,64,64
BGSCREEN 2,64,64
BGSCREEN 3,64,64
puts it all on the screen
BGLOAD 0,BG0
BGLOAD 1,BG1
BGLOAD 2,BG2
BGLOAD 3,BG3
Part 1.
Clears everything
ACLS
each background layer
DIM BG0[16383]
DIM BG1[16383]
DIM BG2[16383]
DIM BG3[16383]
loads each layer
LOAD "DAT:SC_MAP_L0",BG0,0
LOAD "DAT:SC_MAP_L1",BG1,0
LOAD "DAT:SC_MAP_L2",BG2,0
LOAD "DAT:SC_MAP_L3",BG3,0