The first 2 pics show the x2 sets of 64 custom graphics characters (with no spaces between them). They look like they may have been intended to be some kind of textured detail or something or other that the original owner spent some time creating. Does anyone recognise what the odd patterns may have been used for? Probably just some kind of home experiment (or corruption!?).
Here's the page (5) from the manual with a simple basic program to view each of the character sets.
When I enter 11944 and 11949 as the input, it displays the characters in the pictures above. But I must admit I don't really understand the technical side of all this (you may have guessed). Both the extra chips are clearly eproms and not RAM, I think.
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See also these threads here and here