Strange distortion on 32X

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mic_
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Strange distortion on 32X

Post by mic_ » Tue Sep 09, 2008 8:32 pm

If there's anyone here who has a 32X and some means to run code on it, it'd be interesting if you could run this and see what you get.
On my (PAL) 32X + Megadrive 2 I get some weird distortion on the first 16 and the last 48 (give or take) pixels of each row. This obviously doesn't happen in Gens or Fusion.
Basically what I'm doing is:

* Generate one frame of data in SDRAM
* Wait for the next vblank
* Flip the FS bit
* Copy SDRAM data to the framebuffer (in groups of 16 bits)

TmEE co.(TM)
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Post by TmEE co.(TM) » Thu Sep 11, 2008 10:22 am

I got an internal server error...
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mic_
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Post by mic_ » Thu Sep 11, 2008 11:13 am

My web host behaves weird sometimes. Try this link

TmEE co.(TM)
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Post by TmEE co.(TM) » Thu Sep 11, 2008 12:29 pm

For some unknown reason this did not work on my highly modded MD2 + PAL 32X, it did work using my MD1 and other unmodded MD2, but my 32X is modified to accept the centered screen sync signal of my modded MD2 so with other systems there's rolling scrolling screen, thus I can't say anything about the distortion (as the whole screen is ditortion :P)... I'm gonna do some unmodding and check again.
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Post by TmEE co.(TM) » Fri Sep 12, 2008 1:39 pm

Came out that the problem was in the dead cartslot of my MD2...

I could not see any distortions either in 50 or 60Hz and with PAL or NTSC master clocks. Works perfectly.
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Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen

mic_
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Post by mic_ » Sat Sep 13, 2008 7:58 am

That's weird. Maybe it's my 32X then, it's been having trouble generating a stable signal lately. When I start up the Megacart the colors in the menu are either way too dark or way too bright (it works fine when using it on the Megadrive only).

TmEE co.(TM)
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Post by TmEE co.(TM) » Sat Sep 13, 2008 8:37 am

32X does not even have capacitors in it which could cause such anomalies upon being close to dying...
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mic_
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Post by mic_ » Sat Sep 13, 2008 9:55 am

Well, I don't have the metal retainers, and the 32X seems quite sensitive to movement so that might have something to do with it. It used to work fine without them, though.

TmEE co.(TM)
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Post by TmEE co.(TM) » Sat Sep 13, 2008 7:56 pm

I don't have any such thing on my 32X, just the device wobbling in my MD2 cartslot... no problems (if you don't count the cartslot issues of my MD2...)

Japanese units have no RF shields or related things at all BTW
Mida sa loed ? Nagunii aru ei saa ;)
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Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen

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