Press ESC then Back Arrow to cycle through the 128's screen colours :
10 FOR T=4298 TO 4338:READ D:POKE T,D:NEXT
20 SYS 4298:END
30 DATA 169,213,141,56,3,169,16,141,57,3,96,201,95,240,3,76,193,201,162
40 DATA 26,142,0,241,172,1,214,192,255,240,5,200,140,1,241,96,160,240,140
50 DATA 1,214,96