Basic Programming


This prototype is the same as the final release.  The number on the EPROM labels is actually an internal Atari part number; C0120xx was for NTSC carts and C0125xx was for PAL.  The xx is the cart number (20 in this case).

The distortion in the screen shots is due to the programming trick that was used to display more than six sprites on a line.  This trick called "Venetian Blinds" actually displayed the letters as a series of alternating scanlines.  This allowed up to 8 sprites to be displayed at once (four on one set of scanlines, and four on the other).  However this technique doesn't show up well in screenshots since only half of the letters are there when the picture is taken.


What next?  Atari 2600 C++?


Programming at it's ugliest...



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