@Angus:
Internal scandoublers doesn't sample the analogue RGB signal at the 23-pin video-port as the external ones do, but instead reads the signal digitally by hooking on to the outputs from Alice which goes to the DAC and thus get better image-quality as they do not suffer from any sampling artefacts.
Anyhow, all A1200 scandoublers/flickerfixers are crap as they all skip colours. All internal ones gives 4-bits for the green and blue channel and the red channel is the only one which gets the full 8-bit, so AGA games and such look pretty much like they are a OCS/ECS version. In this aspect, some external ones are better as they give 6-bits per colour channel.
The only scandoublers/flickerfixers which gives proper 24-bit (8-bits for each colour channel) are the
DblScan 4000, the
Compserv/Arxon Scandoubler 1/2 and the onboard PicassoIV flickerfixer.
Couple
this or
this with a regular Amiga RGB Scart cable and you are set.
/Patrik
