Oh, and: yes GeTE you've just unearthed from the dust of past time a working copy of GEOS 3.53!
Does the 3.53-Version derive from GEOS 1.2 like the earlier 3.5-Versions did and is there therefore even no proportional mouse-support possible?
Otherwise, a GEOS-Version suitable to be flashed in a 3-plus-1-replacing ROM with support for a 1351-compatible-mous, beeing plugged into a SID-Card and/or a RS232-mouse connected like in this scheme, would be a great achievement (or would have been if published 30 years ago ).
PS: In my e-mail I told you that I have no idea where the three files are comming from. Well, after searching for a while now, I found this link with eight (!) images according to GEOS. I hope you check them all in order to bring it together for a complete 264-GEOS-distribution, Luca.
PS: Oh well, and this must have been the source of my three files, I think.