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[[File:CLK ZX80.gif|right|alt=The emulated display of a ZX80, showing accurate emulation of synchronization issues.]]

Clock Signal's emulated machines produce a 1d video signal, just as real machines do. Its emulated display, therefore, has to:

Composite color is optional for all machines on which it was originally optional. Machines such as the Oric, Electron, and MSX originally shipped with the option of RGB output, so the emulator offers the same.

Sound emulation is generally performed by internal generation of original megahertz-rate audio, which is resampled to the output frequency of the host computer. Therefore just as the video can scale up to modern low-latency high-refresh-rate displays, the audio can scale up to digital output rates such as 96Khz and 192Khz.

That generally allows the emulator to maintain audio latency guarantees completely decoupled from the frame rate. It aims for between 5 and 10ms of audio latency.

===macOS===

For macOS, Clock Signal is a fully-native document model application, which means that the user can simultaneously launch as many different machines as they want, sizing and positioning each independently across multiple displays, arranging their machines into a tabbed interface or performing any other standard Mac windowing actions. It uses Metal for graphics output and is provided as an Intel/Apple Silicon universal binary.