The version of Gen Assembler is version 2.04. There is a copy in the Vscreen 1.0 disk image (probably should not be there but oh well 
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What PDF/Txt are you looking for? The main documentation I had written was in HTML format on my old site. I'll try to improve the inline documentation and better structure the code for the new version.
The pdf I was looking for was about the syntax used in Gen Assembler in order to be able to "translate" the code in to the SjAsm syntax, some of the codes at the Gen files (ie. Macros or Includes) are not the same way the SjAsm allows. However, someone already sent to me the url to download it: http://msx.hansotten.com/uploads/files/gen80ug.pdf
Using Tiled is a great idea but I don't know about the Mumbly converter, is it already freely available ?
Cheers,
