Clock Frequency (1991)(Carlo Delhez) ROM Download can be obtained free for Sinclair ZX81 on EmuGames.net only. Play emulator game in English for the USA region. Clock Frequency is a Sinclair ZX81 ROM that you can download to your computer or play online within your browser. You can also download roms such as Clock Tower and Clock Tower 2 The Struggle Within that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.