Graphical glitch in Atari 2600 Crystal Castles

nweez / bizhawk

Automatically exported from code.google.com/p/bizhawk

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Graphical glitch in Atari 2600 Crystal Castles #260

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago

What steps will reproduce the problem?
1. Start the game
2.
3.

What is the expected output? What do you see instead?

Expected: game draws the first castle.  See second attachment for Stella 
emulation.
Seen: game draws first castle, there is also garbage lines in upper-left.  See 
first attachment for BizHawk emulation.

What version of the product are you using? On what operating system?
1.8.1, Windows 7 64-bit

Please provide any additional information below.
I do not believe this graphical glitch affects gameplay.

Original issue reported on code.google.com by djk...@gmail.com on 31 Aug 2014 at 4:29

Attachments:

[Crystal Castles (1984) (Atari).2014-08-30 21.23.20.png](https://storage.googleapis.com/google-code-attachments/bizhawk/issue-260/comment-0/Crystal Castles %281984%29 %28Atari%29.2014-08-30 21.23.20.png)
[Crystal Castles (1984) (Atari).png](https://storage.googleapis.com/google-code-attachments/bizhawk/issue-260/comment-0/Crystal Castles %281984%29 %28Atari%29.png)

GoogleCodeExporter commented 9 years ago

Addded tags and confirmed error/bug.

Original comment by hegyak on 31 Aug 2014 at 10:45

Changed state: Accepted
Added labels: Core-Atari2600Hawk, Priority-Medium, Type-Defect

GoogleCodeExporter commented 9 years ago

This smells like those often reported NES "bugs" about trash on the edge of the 
display that actually exist on a real console but are masked by overscan.  What 
verification do we have that the real hardware doesn't do this?

Original comment by goyu...@gmail.com on 31 Aug 2014 at 4:38

GoogleCodeExporter commented 9 years ago

https://www.youtube.com/watch?v=70k3iIsDH1w This video shows the game on an 
actual console.  Console is shown at 0:22 and 9:27.  The screen in question is 
drawn at 2:03.  The graphical glitch displayed by BizHawk is not displayed by 
the actual console.

In fact, I've come across three Atari games that I considered to be rather 
common and popular that were not emulated properly on BizHawk (this one is the 
third one).

Original comment by djk...@gmail.com on 31 Aug 2014 at 7:11

GoogleCodeExporter commented 9 years ago

I can't make out anything from that video as to what that TV's overscan limits 
are relative to the raster area.

Original comment by goyu...@gmail.com on 31 Aug 2014 at 11:58

Added labels: Priority-Low
Removed labels: Priority-Medium

GoogleCodeExporter commented 9 years ago

Well, regardless of whether it would be visible on a TV, stella is displaying 
those pixels, and suppressing the garbage somehow. Maybe it's a corner case of 
beam control in the raster area which we're not handling.

Original comment by zero...@zeromus.org on 2 Sep 2014 at 5:29