Spectrum 512 Extended

Spectrum 512 Extended (SPX) is a variant of the Spectrum 512 Atari image formats, extended to support larger pictures.

Identification
Files begin with ASCII " ".

Software

 * Konvertor

Sample files

 * http://cd.textfiles.com/geminiatari/FILES/GRAPHICS/SPECPICS/ → *.SPX
 * https://telparia.com/fileFormatSamples/image/spectrum512X/