Colin Piggot
Mon, 05 May 2008 14:26:46 -0700
Thomas wrote: > Is it correct to say that a 204x192 (204 is approximately 256 *4/5) > image on the SAM will occupy approximately the same amount of space on > a TV screen as a 256x192 image on the Spectrum? I've never felt that 5:4 is bang on the correct aspect ratio. From measuring on a few tellies, as well as looking at video timing, I observe the ratio to me is about 1.28-1.29 (5:4 being 1.25, 4:3 being 1.33). Timing wise, the SAM draws the 256 pixel area in 42.6us from what i've scoped and worked out in terms of clock pulses. Figures I've seen on the web for the ZX Spectrum show it draws it's 256 pixels in 36.6us. So... quick bit of maths, and it shows that the ZX Spectrum display area would be the width of 220 SAM pixels. Colin. ===== Quazar : Hardware, Software, Spares and Repairs for the SAM Coupe 1995-2008 - Celebrating 14 Years of developing for the SAM Coupe Website: http://www.samcoupe.com/