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How do games draw the score counter?

TIA Atari 2600 Atari Score Counter

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#1 StinkerB06 OFFLINE  

StinkerB06

    Space Invader

  • 14 posts
  • Location:California, U.S.

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 ONLINE  

SpiceWare

    Draconian

  • 12,212 posts
  • Medieval Mayhem
  • Location:Planet Houston

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:

010101

 

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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