So if I understood you need something to do 15Khz->HDMI resolution
of choice solution so you can play old games in new high resolutions ?
Some (most) new TVs do a job very nice but some not so much.They take
care of interlace too.I'm sure there is a gadget that inputs Amiga PAL or
NTSC signal and outputs TFT resolutions but quality of picture may not
be so good.
