On May 19, 2015, at 1:03 PM, Mark J. Blair <nf6x at nf6x.net> wrote: > My old Color Computer used US VHF channels 3 or 4 for NTSC video. I found a reference to the ZX Spectrum using UK UHF channel 35 for PAL video. My NTSC ZX81 uses US UHF 34/35. -- Follow me on twitter: @FozzTexx Check out my blog: http://insentricity.com