After seeing the unreleased Atari version of Pacman on the ColecoVision, which I think is a pretty good version, I noticed that the game doesn't seem to have much "flickering" when 4 or more sprites are on the same horizontal level like other games do. I admit that I never got past basic programming on my ADAM, but I do know a little about the ColecoVision's limitations so my question is to you fine people that have way more knowledge than I have about programming. How was Atari able to do this as well as they did? Has anyone studied the ROM to see how they pulled it off as well as they did?
Many Thanks!
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Unreleased Coleco Pacman version non flicker sprite question
Started by 65Gamerguy, Aug 28 2011 2:47 PM
4 replies to this topic
#2 OFFLINE
opcode
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River Patroller
- Bringing new life to your ColecoVision!
- Location:Franklin, MA
Posted Sun Aug 28, 2011 2:54 PM
65Gamerguy, on Sun Aug 28, 2011 2:47 PM, said:
After seeing the unreleased Atari version of Pacman on the ColecoVision, which I think is a pretty good version, I noticed that the game doesn't seem to have much "flickering" when 4 or more sprites are on the same horizontal level like other games do. I admit that I never got past basic programming on my ADAM, but I do know a little about the ColecoVision's limitations so my question is to you fine people that have way more knowledge than I have about programming. How was Atari able to do this as well as they did? Has anyone studied the ROM to see how they pulled it off as well as they did?
Many Thanks!
Many Thanks!
The eyes are backgroung graphics. So you can have all 4 ghosts in the same scanline and no flickering.
#3 OFFLINE
65Gamerguy
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Star Raider
Posted Sun Aug 28, 2011 3:03 PM
opcode, on Sun Aug 28, 2011 2:54 PM, said:
65Gamerguy, on Sun Aug 28, 2011 2:47 PM, said:
After seeing the unreleased Atari version of Pacman on the ColecoVision, which I think is a pretty good version, I noticed that the game doesn't seem to have much "flickering" when 4 or more sprites are on the same horizontal level like other games do. I admit that I never got past basic programming on my ADAM, but I do know a little about the ColecoVision's limitations so my question is to you fine people that have way more knowledge than I have about programming. How was Atari able to do this as well as they did? Has anyone studied the ROM to see how they pulled it off as well as they did?
Many Thanks!
Many Thanks!
The eyes are backgroung graphics. So you can have all 4 ghosts in the same scanline and no flickering.
Thanks for that information. As good is this game is, it is in no way near as good as your opcode version, it pales in comparison.
#4 OFFLINE
opcode
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- 2,406 posts
River Patroller
- Bringing new life to your ColecoVision!
- Location:Franklin, MA
Posted Sun Aug 28, 2011 3:40 PM
65Gamerguy, on Sun Aug 28, 2011 3:03 PM, said:
opcode, on Sun Aug 28, 2011 2:54 PM, said:
65Gamerguy, on Sun Aug 28, 2011 2:47 PM, said:
After seeing the unreleased Atari version of Pacman on the ColecoVision, which I think is a pretty good version, I noticed that the game doesn't seem to have much "flickering" when 4 or more sprites are on the same horizontal level like other games do. I admit that I never got past basic programming on my ADAM, but I do know a little about the ColecoVision's limitations so my question is to you fine people that have way more knowledge than I have about programming. How was Atari able to do this as well as they did? Has anyone studied the ROM to see how they pulled it off as well as they did?
Many Thanks!
Many Thanks!
The eyes are backgroung graphics. So you can have all 4 ghosts in the same scanline and no flickering.
Thanks for that information. As good is this game is, it is in no way near as good as your opcode version, it pales in comparison.
...background, not "backgroung".
Atari's Pac-Man was designed so that the space inside the maze didn't use the same "tiles" as the maze walls. That is why they could use background graphics for the eyes.
For my port I used the arcade maze and scaled everything down 3/4, so I didn't have the same conditions. On the other hand I could better replicate the arcade gameplay. I am doing the same thing with Moon Cresta, scaled down 3/4 on the y axis.
#5 OFFLINE
newcoleco
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Stargunner
Posted Mon Aug 29, 2011 2:12 PM
I had to play very long and be lucky to see sprites flickering with Atarisoft version of PacMan for the ColecoVision, putting all the ghost and PacMan pretty much on the same horizontal line. And now, I can't remember if there was sprites flickering or just disappearing of a ghost body for a split second.
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