Nateo Posted March 5, 2018 Share Posted March 5, 2018 Quick question - on a lot of screenshots I've seen of the CoCo in action with, let's say, Donkey King, the colors are light blue and orange. On my CoCo, all I'm getting is magenta and green. What's the deal here? Thanks all! Quote Link to comment Share on other sites More sharing options...
thetick1 Posted March 6, 2018 Share Posted March 6, 2018 (edited) Are you sure you don't have Monkey Kong for the CoCo or another Donkey Kong rip off? http://www.mobygames.com/game/trs-80-coco/monkey-kong http://www.mobygames.com/game/donkey-king As the recent Donkey Kong looks real good ? http://www.mobygames.com/game/trs-80-coco/donkey-kong_ Edited March 6, 2018 by thetick1 Quote Link to comment Share on other sites More sharing options...
BassGuitari Posted March 6, 2018 Share Posted March 6, 2018 Quick question - on a lot of screenshots I've seen of the CoCo in action with, let's say, Donkey King, the colors are light blue and orange. On my CoCo, all I'm getting is magenta and green. What's the deal here? Thanks all! I had this issue with an old CoCo 1 I used to have--the artifact colors of PMODE4(? whichever PMODE uses artifact colors) showed green and purple instead of blue and orange. Never really nailed down what caused the issue, unfortunately. But there's a resistor(?) in a clear plastic tube enclosure near the RF modulator that seemed to need additional grounding; whenever I poked at it or touched it, the artifact colors improved a bit and became much closer to what they were supposed to be. I never went as far as to actually attempt any soldering, but all my MacGuyver attempts at grounding it resulted in failure (perhaps unsurprisingly). Eventually I just got a different one and ditched it. 1 Quote Link to comment Share on other sites More sharing options...
Nateo Posted March 6, 2018 Author Share Posted March 6, 2018 Are you sure you don't have Monkey Kong for the CoCo or another Donkey Kong rip off? http://www.mobygames.com/game/trs-80-coco/monkey-kong http://www.mobygames.com/game/donkey-king As the recent Donkey Kong looks real good ? http://www.mobygames.com/game/trs-80-coco/donkey-kong_ It's most certainy Donkey King. I did read somewhere that the PAL colors for the CoCo end up being purple and green due to the differences in artifcating results between the two systems. But I'm in NTSC land, so I have no idea whats going on. Quote Link to comment Share on other sites More sharing options...
JamesD Posted March 6, 2018 Share Posted March 6, 2018 I thought PAL shows CoCo PMODE 4 graphics output as B&W. Quote Link to comment Share on other sites More sharing options...
Nateo Posted March 7, 2018 Author Share Posted March 7, 2018 (edited) I asked on the CoCo Facebook group, and I got my answer! It's the color burst circuit: https://sites.google.com/site/thezippsterzone/home/coco2-projects/vertical-yellow-bar-fix Edited March 7, 2018 by Nateo Quote Link to comment Share on other sites More sharing options...
Mr SQL Posted March 7, 2018 Share Posted March 7, 2018 I remember seeing Color Computer 2's that output green instead of blue at the Radio Shack where the Computer Club I was in used to meet circa 1985. I also saw Color Computers that had real lowercase characters via a new revision of the 6847 VDG, they may have been the same model. Quote Link to comment Share on other sites More sharing options...
JamesD Posted March 7, 2018 Share Posted March 7, 2018 I remember seeing Color Computer 2's that output green instead of blue at the Radio Shack where the Computer Club I was in used to meet circa 1985. I also saw Color Computers that had real lowercase characters via a new revision of the 6847 VDG, they may have been the same model. The color issue is largely the TV settings. NTSC and artifact colors can be different from one TV to the next. Quote Link to comment Share on other sites More sharing options...
Mr SQL Posted March 7, 2018 Share Posted March 7, 2018 The color issue is largely the TV settings. NTSC and artifact colors can be different from one TV to the next. It was only the artifact colors that were affected, the light green text screen was the same. The article suggests the colorburst was always generated on phase A, but we often had to reset until the artifact palette switched up the blue and red correctly. I had thought that it was switching phase when that happened. Quote Link to comment Share on other sites More sharing options...
JamesD Posted March 7, 2018 Share Posted March 7, 2018 It was only the artifact colors that were affected, the light green text screen was the same. The article suggests the colorburst was always generated on phase A, but we often had to reset until the artifact palette switched up the blue and red correctly. I had thought that it was switching phase when that happened. Not sure where you are going with this. "It was only the artifact colors that were affected, the light green text screen was the same" as in, unaffected because it didn't use artifacts. Quote Link to comment Share on other sites More sharing options...
Mr SQL Posted March 7, 2018 Share Posted March 7, 2018 Not sure where you are going with this. "It was only the artifact colors that were affected, the light green text screen was the same" as in, unaffected because it didn't use artifacts. It was a computer club setting so I'm pretty sure we tried other CoCo's on the same TV to compare. We also encountered CoCo's with a slightly different shade of green on the text screen and models with lowercase in the 6847. Quote Link to comment Share on other sites More sharing options...
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