Main > Monitor/Video Forum
Powerstrip writeup
Barkuti:
VooD, you can do whatever you need with PowerStrip. You seem to lack the knowledge of how analog signals work. From a monitors standpoint, all "resolutions" working at or around the same horizontal scanning frecuency are the same (digital units may distinguish between differently polarized sync signals modes, but that's another story).
For a CGA (~15.7 KHz) mode, if you are not getting correct refresh rates is because you're not using the correct amount of lines. For a 60 Hz refresh rate, that translates into 262 lines, and 15720 Hz Hsync frecuency. I mean, ALL 60 Hz modes at that Hsync frecuency HAVE 262 lines. This is axiomatic: Hsync freq. = lines * refresh.
When you refer to 224 or 240 lines, you're referring to the active lines. Total mode lines = active lines + blanking lines. So you're missing the blanking lines, 38 for 224 line modes and 22 for 240 ones.
I heartily recommend you this tutorial:
Modeline howto / tutorial / help -- Cathode Ray Tubes (CRTs)
Cheers
ZeroPoint:
Barkuti ! Just wondering if you could help me with something here.
I have been using PowerStrip and Radeon-cards a couple of years now. My latest card is X850 (actually x1300 but that is not supported by PowerStrip yet). I use a scart television that I have "underscan"-adjusted.
Now to the problem: I cannot display the whole 240 active lines. It
Barkuti:
Mmm, haven't messed thoroughly with the issue but it seems SCART TV's share this problem in common. These may be "reserving" some front and back lines for unknown reasons to me.
Have you tried increasing front/backporch at the cost of the "width" lines? Maybe too few to be of any help, right?
Once I thought in asking Andy Warne about the red, green and blue lines that appeared on the upper part of the screen of my old desktop TV when connected to the AVGA (I corrected its overscan also). All modes shown them but only the ones with close to 90% or more active lines were being clipped. Sold it some time ago now so I forgot to investigate on it.
My arcade monitor should be in my hands in 2 to 3 days; we'll know for sure then. :police:
Cheers
dabone:
--- Quote ---For a CGA (~15.7 KHz) mode, if you are not getting correct refresh rates is because you're not using the correct amount of lines. For a 60 Hz refresh rate, that translates into 262 lines, and 15720 Hz Hsync frecuency. I mean, ALL 60 Hz modes at that Hsync frecuency HAVE 262 lines. This is axiomatic: Hsync freq. = lines * refresh.
When you refer to 224 or 240 lines, you're referring to the active lines. Total mode lines = active lines + blanking lines. So you're missing the blanking lines, 38 for 224 line modes and 22 for 240 ones.
--- End quote ---
How do you think you setup powerstrip for proper 60hz display?
And how to tell mame that a 262 line mode in windows only has 240 active lines?
The mode lines I use from a earlier post.. i.e.
480x240=480,16,48,32,240,4,3,15,9072,7
512x240=512,16,48,40,240,4,3,15,9702,7
512x256=512,16,48,40,256,4,3,17,9702,7
512x264=512,16,48,40,264,5,3,17,9702,7
576x240=576,8,56,48,240,4,3,15,10836,7
592x240=592,16,56,48,240,4,3,15,11214,7
608x240=608,16,64,40,240,4,3,15,11466,7
768x240=768,16,80,56,240,4,3,15,14490,7
640x240=640,16,64,48,240,4,3,15,12096,7
640x256=640,16,64,48,256,4,3,17,12096,7
672x240=672,16,64,56,240,4,3,15,12726,7
704x256=704,24,72,48,256,4,3,17,13356,7
704x264=704,24,72,48,264,5,3,17,13356,7
704x288=704,24,72,48,288,5,3,19,13356,7
736x240=736,16,72,56,240,4,3,15,13860,7
784x240=784,24,80,56,240,4,3,15,14868,7
768x288=768,16,80,56,288,5,3,19,14490,7
424x272=424,16,40,32,272,4,3,18,8064,7
448x240=448,8,48,32,240,4,3,15,8442,7
512x240=512,16,48,40,240,4,3,15,9702,7
512x288=512,16,48,40,288,5,3,19,9702,7
632x264=632,16,64,48,264,5,3,17,11970,7
640x288=640,16,64,48,288,5,3,19,12096,7
800x288=800,24,80,56,288,5,3,19,15120,7
80% of those display correctly on a commodore 1084 monitor (and a d9200)
and display the correct amount of lines. (Be it 50 or 60hz)
The front and back porch defines the retrace period.
Not the active number of lines. (If you notice the 50hz and 60hz modes have different front porch values)
I keep running into the problem when I try to use the lower pclocks
the card and computer locks up or generates a unusable display.
This is with nvidia and ati radeon chips.
To me the powerstip solution seems to be a dead end at the moment, along with
advmame under windows. (no support for the newer video cards)
I would love to put a good video card into my main mame system, my arcadevga 9200 based version really sucks at house of the dead 3.
Later,
dabone
wpcmame:
--- Quote from: dabone on November 14, 2005, 04:27:35 pm ---I keep running into the problem when I try to use the lower pclocks
the card and computer locks up or generates a unusable display.
--- End quote ---
Saw this thread in the powerstrip forum.
http://www.entechtaiwan.net/forums/viewtopic.php?t=2903
Maybe that solves the low pixel clock problems.
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