The scaler you use does not even do RGB Digital to RGB Analogue conversion! For this you need a separate device and if you want brown instead of dark yellow, it will need 5V power. Pyrofer's device takes this directly from the VIC-video-port I think. The BIT-C128.com needs an extra power supply or can be powered through the GBS-8220 (or through the VIC-video-port as well if you build the cable). The GGLAB CGA2RGB also needs a power supply to do the brown-conversion.