*Spectrum and Amstrad both have a '''bitmapped''' display.
*while''' ZX spectrum''' has a quite '''basic 1bpp character based colour display''', '''Amstrad CPC''' can be considered an '''upgraded CGA display minus the Character based text modes''' (with a 16colours modes such as the Tandy's own custom "CGA" had... and a differently logic based palette), with a range or 4bpplow resolution, 2bpp square resolution and 2bpp 1bpp high resolution Attribute free video display.
*'''They have a similar screen size.''' But '''Amstrad CPC''' actually produces smaller pixels in it's "equivalent" video mode (mode 1). The normal display resolution on the Amstrad CPC is '''320x200''' (mode 1) while '''ZX Spectrum''' produces "only" '''256x192''' pixels. Amstrad's screen can be reduced in size to match the Spectrum's (256x192, in Mode1) but then the actual display window is quite smaller than on a spectrum (on the same monitor) and has a larger border because the generated pixels are slightly smaller.