Is the rom on the other side maybe?
Im interested in this too 'cos I have an apollo1240 I want to get upgraded as well, and going by what Ive reaped from a few threads here and there a long/rectangle chip on the reverse side (on mine marked "60/56x") kinda matches (the x is actually another number that has been overwritten with a black permanent marker, so Im not sure what no. is really there).
I could be completely off the mark though. Im only just now starting to look into it myself.