Across: 4 Pie chart, 8 Protocol, 9 Centre, 10 Snookers, 12 Ect, 13 Pirate, 14 Transducer, 17 Manic miner, 19 Boot up, 21 Sos, 22 Reformat, 25 Serial, 26 Nineteen, 27 Flashing.

Down: 1 Tree sort, 2 Stations, 3 Screen dump, 4 Plastic, 5 Echo, 6 Hacker, 7 Rear, 11 See, 13 Processing, 15 Discrete, 16 Messages, 18 Nesting, 19 Bar, 20 Trolls, 23 Evil, 24 Midi.