9 ; disable hc595 outputs
15 ; clear hc595 registers
18 ; rck -> high (store shift register data)
30 ; port d 2 -> output (debug clk!)
33 ; port d 3 -> output (debug vertical!)
36 ; release hc595 register clear
43 ; storage clock -> low
46 ; zero to everything ...
47 cbi PORTB,3 ; clear hc595 registers
48 sbi PORTB,1 ; store shift register data
49 cbi PORTB,1 ; release hc595 register clear
50 sbi PORTB,3 ; storage clock -> low
296 ; store to storage register