ZX80 Pause Routine?

edited November 2009 in Sinclair Miscellaneous
I read this in the first issue of Sinclair User...

"Ken MacDonald's Amazing Active Display, a machine code pause routine, showed that there was more to the ZX-80 than met the eye."

I guess this was the software solution that people used to display flicker-free games on the ZX80.

Does anyone know where or when this routine was first published? In a mag, or in a book or something??
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