That's roughly what I did for my ANSI console/viewer... I started with EGA resolution, and each ega pixel renders 3x4 in its' buffer then a minor blur, then scaled to fit the render area. The effect is really good down to about 960px wide, which is a bit bigger in terms of real pixels than the original... at 640px wide, it's a little hard to make out the actual pixels... but it's the best way I could think of to handle the non-square pixels of original EGA or VGA... I went with EGA because the ratio is slightly cleaner IMO. It's also what OG RIPterm used.