Jump to content
IGNORED

5200 Atract mode


Recommended Posts

Has anybody used the feature to remove the automatic ATRACT mode?

I need it disabled as the gameplay becomes longer and longer...

I've been looking into the BIOS code, and it seems to me that if the main loop ensures that the value in the ATRACT address ($04) is positive ( >=0 ) this mode will be disabled.

Based on that, I set address $04 each and every VBI to $01 until the game is over... It seems to work as expected but I'm not sure that this is the way it was supposed to be done... Any idea?

 

Thanks,

OldGuru.

Link to comment
Share on other sites

The way I read it, this value is incremented, and when it reaches $7F or $80, the attract mode turns on. What I've done is set it back to $00 and everything seems okay.. this seems to work on both emulators (Atari800 dos, & VSS), but I haven't tried on the real thing. BTW, instead of setting it every vblank, maybe just reset it when there is joystick/button movement, that way it can still work as intended.

 

calamari

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...