RGB to VGA 15 kHz Scan Converter

[alexh]

Despite what they put on their web-page this device (a Cypress CM-397) is not a 24-bit scandoubler.

I mean come on, it says it converts CGA signals and it doesn't.

Also it has a built in frame-rate converter (automatic 50Hz -> 60Hz conversion) that cannot be disabled making it impossible to get smooth scrolling in PAL games and demo's

[alexh]

Treadwheel wrote:
Some colors have dither patterns.

Interesting. Not what you expect from a scandoubler. If it doesn't support 24-bit colours you get quantisation errors and the result, rather than looking like dither look more like banding as fine details are lost for solid blocks of colour.