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Sofia and Lode Runner issues?


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#1 scotty OFFLINE  

scotty

    Moonsweeper

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Posted Fri Apr 12, 2019 8:07 PM

So I have an S-Drive Max, Sofia and Ultimate1MB in one of my 800XLs.  Decided to play some Lode Runner today.  Title screen plays fune, but after the game starts, the screen starts going on and off.  Does not do it on the title screen, just the ameplay.  Other games play fine.  Also noticed some games that use artifacting are in black and white, while others seem to be OK.  Pinball Construction Set is one that comes to mind that is black and white.  Is this normal?



#2 Gavin1968 OFFLINE  

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    Star Raider

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Posted Fri Apr 12, 2019 8:24 PM

Bad image maybe? 



#3 Nezgar OFFLINE  

Nezgar

    Stargunner

  • 1,964 posts
  • Location:Saskatchewan Canada

Posted Fri Apr 12, 2019 9:38 PM

Artifacting in the 320x192 modes is only present in the NTSC composite output. S-Video & RGB from Sophia I presume will be similar, and show it in monochrome only. (Unless I am mistaken, and sophia has some mode to emulate artifacting?)

 

Anyhow, I'm pretty sure lode runner relies on artifacting for colour, since it was a direct port from the Apple II. Same with games like Drol, Choplifter, AE, David's Midnight Magic, (the original, not the one with the graphics 15 hack)

 

Some examples:

146049.png

Lode Runner with no artifacting. This is what you will see with an S-Video connection, and I suspect Sophia as well.

 

lode_runner_broderbund_2.png

Lode runner with artifacting. Blends the thin vertical lines to color on a composite or RF output.

 

PAL has very subtle artifacting, but is still primarily monochrome stripes...

 

Not sure about the 'screen going on and off' - does sophia let you see the original video output simultaneously to compare?



#4 vattari OFFLINE  

vattari

    Chopper Commander

  • 125 posts

Posted Sat Apr 13, 2019 9:42 AM

So I have an S-Drive Max, Sofia and Ultimate1MB in one of my 800XLs.  Decided to play some Lode Runner today.  Title screen plays fune, but after the game starts, the screen starts going on and off.  Does not do it on the title screen, just the ameplay.  Other games play fine.  Also noticed some games that use artifacting are in black and white, while others seem to be OK.  Pinball Construction Set is one that comes to mind that is black and white.  Is this normal?


Which Sofia do you have - RGB or DVI?


Sent from my iPad using Tapatalk

#5 scotty OFFLINE  

scotty

    Moonsweeper

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  • I have, but have **YOU** played Atari today?
  • Location:North Olmsted, Ohio

Posted Sat Apr 13, 2019 10:05 AM

Which Sofia do you have - RGB or DVI?

 

DVI



#6 scotty OFFLINE  

scotty

    Moonsweeper

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  • I have, but have **YOU** played Atari today?
  • Location:North Olmsted, Ohio

Posted Sat Apr 13, 2019 12:10 PM

Bad image maybe? 

 

Image is known good.  Works on Altirra, and on real hardware without the Sofia board.  Tried 0S-B, 1200XL and XL/XE OSes






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