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RISC PC and Widescreen Monitor |
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leeshep (13:47 20/1/2013)
helpful (17:19 20/1/2013)
leeshep (16:43 22/1/2013)
CJE (11:17 23/1/2013)
helpful (12:40 23/1/2013)
Phlamethrower (12:59 23/1/2013)
arawnsley (00:44 21/1/2013)
filecore (08:57 22/1/2013)
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Lee Shepherd |
Message #121771, posted by leeshep at 13:47, 20/1/2013 |
Member
Posts: 25
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Good afternoon everyone,
I've just got my RISC PC out of storage (a castle manufactured Kinetic RISC PC running RISC OS 6) and I'm trying to get it hooked up to my new monitor (a Viewsonic widescreen 1920x1080)
I found what i believed to be the correct MDF for 1920x1080 but when i select this mode the screen becomes garbled and the right hand side of the iconbar is too right (ie switcher, monitor etc off screen)
This is the MDF i used -
# 1920 x 1080 (60 Hz)
startmode
mode_name:1920 x 1080
x_res:1920
y_res:1080
pixel_rate:138500
h_timings:32,80,0,1920,0,48
v_timings:5,23,0,1080,0,3
sync_pol:2
endmode
I havent got a Viewfinder or a VPod so its running off the VIDC20 with 2mb VRAM. Is there a more suitable MDF anywhere? or is the VIDC just not up to it.
Any help greatly appreciated
Lee |
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Bryan Hogan |
Message #121772, posted by helpful at 17:19, 20/1/2013, in reply to message #121771 |
Member
Posts: 249
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This is what I use on my Omega:
# 1920 x 1080 (60Hz)
startmode
mode_name:1920 x 1080
x_res:1920
y_res:1080
pixel_rate:148500
h_timings:48,128,0,1920,0,104
v_timings:5,36,0,1080,0,4
sync_pol:0
endmode
That should work on a RiscPC, although only in 256 colours. |
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Andrew Rawnsley |
Message #121773, posted by arawnsley at 00:44, 21/1/2013, in reply to message #121771 |
R-Comp chap
Posts: 595
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I suspect you'll have trouble with the vidc clocks at that kind of res. I know I had problems getting 1680x1050 reliably out of RiscPCs, although it does depend upon which generation of RPC you have - earlier ones are better for high resolutions than later ones, due to Acorn's dodgy filtering for EU regulations  |
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Jason Togneri |
Message #121777, posted by filecore at 08:57, 22/1/2013, in reply to message #121771 |
Posts: 3867
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the right hand side of the iconbar is too right (ie switcher, monitor etc off screen) I've had this issue before. So long as the desktop is drawing normally (ie., everything displays okay except the desktop is incorrectly centered on the monitor), try using your monitor's autoadjust feature and let it place the desktop correctly on the monitor itself. You may have to autoadjust again when using the monitor with another machine. |
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Lee Shepherd |
Message #121780, posted by leeshep at 16:43, 22/1/2013, in reply to message #121772 |
Member
Posts: 25
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Thanks Bryan, that MDF works fine....
I've lowered the pixel rate to 127660 which after experimentation seems to be the lowest my monitors happy with.... (52Hz)
I think I'm going to slap a heat sink on the VIDC20 as it doesn't seem to like being driven so hard, occasionally I get a bit of screen tearing if I move windows around quickly.
On a unrelated note. Can anybody tell me what the latest version of AMPlayer is? The version i've got (that came with RISC OS 4.39) doesn't seem to like RISC OS 6. If I load it and click menu on the Iconbar Icon it hasn't got the correct menu like it has on RISC OS 4 it just says imenu instead of Configure, Quit etc.
Thanks in advance,
Lee |
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Chris Evans |
Message #121781, posted by CJE at 11:17, 23/1/2013, in reply to message #121780 |
CJE Micros chap
Posts: 228
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I don't think the tearing is heat related but timing, I've pushed the clock rate up on some machines to the point that if I do certain things the display will tear. This happens cold or hot. |
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Bryan Hogan |
Message #121782, posted by helpful at 12:40, 23/1/2013, in reply to message #121780 |
Member
Posts: 249
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I doubt a heat sink would make any difference, as VIDC isn't doing any more work whether you are moving windows or not, it's only a dumb frame buffer! As Chris said, it's more likely bus timing issues.
IIRC the VIDC is rated upto pixel rates of 152000, many do 160000, and I have run mine at 176000 but not for long. At those higher rates only 16 colours are possible because the VRAM can't supply the data fast enough (max 160MB/s).
BTW, I can't take credit for the MDF as I'm fairly sure I just got it off another website or newsgroup posting. |
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Jeffrey Lee |
Message #121784, posted by Phlamethrower at 12:59, 23/1/2013, in reply to message #121782 |
 Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot stuff
Posts: 15100
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I have been able to get my RiscPC to do 1920x1200 before (screenshot here with mode timings). I didn't mess around with it for long (the monitor was destined to be used with my Iyonix), but it seemed stable. The key thing I found was to pay attention to any warnings that MakeModes gives about timings being out of range (porch/sync, etc.) - if it complains about any of those then you'll likely get a completely garbled display as VIDC falls over itself. And amazingly my monitor didn't complain about the 51Hz signal, the manual says it's only meant to go down to 56Hz. |
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