Please use:
Altirra 1.7 beta25 and above
http://www.virtualdub.org/beta/Altirra-1.7-test32.zip
Best view:
- View/Filter Mode/ - "Point" 
- View/Stretch Mode/ - "Integral Square Pixels" 
- View/Overscan Mode/ - "Normal" and turn on "Extended PAL Height"
- System/Video/ turn on "PAL" and off all VBXE options
- System/Video/Adjust Colors.../ "Load Preset" and choose "G2F" 

or

real PAL Atari with monitor/tv which allow to show 22-23 additional lines

Don't use Atari++ or any Atari800 based emulator. No additional lines.
