(MESS) atari400.c progress:  [Fabio Priuli]
- Rewritten cart emulation to use slot devices (many 
  "mappers" do not fully work) and unified cart handling 
  among 8bit home computers, XEGS and Atari 5200
- Added support for loading carts with bankswitch to all XL/XE 
  models
- Added support for loading XEGS carts in Atari 8bits home
  computers (XEGS instead will only load XEGS games until
  support for the keyboard add-on is included)
- Big clean up of the driver, simplifying memory map, removing
  writes to ROM, etc.
- Changed NOT_WORKING flag to IMPERFECT_GRAPHICS
  in 600XL, 65XE, 800XE and XEGS since they should now be 
  working to the same extent of the 800XL, and bugs shall be 
  reported.


as a consequence of the above changes, the new softlists a800.xml, a5200.xml
and xegs.xml are not compatible anymore with 0.154: keep the old xmls until
0.155 if you don't compile your own exe