1'ROM v1 can't stop the
2'built-in LED sequencer.
3'But we can slow it down
4'and interact before it
5'wants to change state.
10'Slow LED sequencer
20 POKE 47,255:'Slowest
30 FOR N=0 TO 15
35 POKE 45,255:'Max delay
39'Set LED state
40 POKE 20,N
49'Reset frame counter
50 POKE 14,0
59'Wait half second
60 IF PEEK(14)<30 GOTO 60
70 NEXT N
80'Restore to defaults
90 POKE 47,9:POKE 45,0