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How do games draw the score counter?

TIA Atari 2600 Atari Score Counter

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#1 StinkerB06 OFFLINE  


    Space Invader

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Posted Sat Mar 17, 2018 7:57 PM

In games, there is a 6-digit number at the top or bottom of the screen, indicating the player score or anything else 6-digit-related. How does the TIA draw that score counter?

#2 SpiceWare OFFLINE  



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  • Medieval Mayhem
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Posted Sun Mar 18, 2018 9:23 AM

That's one of the more advanced TIA tricks.  It uses both players (sprites) in three copies-close mode (NUSIZ0 and NUSIZ1 set to 3) like this for player0:

0 0 0


and this for player1:

1 1 1


By interleaving them you end up with this:



With the use of Vertical Delay (VDEL0 and VDEL1 set to 1), and appropriate timing during the scanline, you can update all 6 copies with distinct images.

Also tagged with one or more of these keywords: TIA, Atari 2600, Atari, Score Counter

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