Well,
since no-one else has posted this yet, I am gonna inform you that there is a color JPG viewer for the A8 available here:
http://rjespino.tripod.com/8bit/colrjpeg/colrjpeg.html
The viewer requires 64k and works great in gr. 8 and 15 modes (high + medium resolution with lots of colours). It also supports some kind of Apac mode... greetings, Andreas.