1 ; http://www.retroprogramming.com/2015/10/the-matrix-digital-rain-for-zx-spectrum.html
4 ; black border / black attributes
16 ; fill screen with random characters
35 ; randomize one character
45 ; select a random column
52 ; ~1% chance black -> white
58 ; white -> bright green
64 ; bright green -> green
69 ; ~6% chance green -> black
98 ; display a random glyph
104 ;k8: replaced with this
105 ; calculate ROM char address
128 ; get a byte from the ROM