Image cut off on IREM m72 X multiply board

[Hoagtech]

I bought this board to use with the M72 Multi from Apocalypse.

The image on the bottom of the screen is cut off and the score is missing.

Is there a way I can fix this issue?

I am a week out for the multi pre order and am hoping to have this remedied by then.

The third photo shows what I am missing.

[Hoagtech]

It seems I need to adjust the vertical image up but not the vertical height. I heard IREM boards have a tall resolution that requires you to adjust.

IS this doable on the OSSC?

To be clear I am not trying to stretch or squish the image. I am trying to line up an image properly in a 240p space.

Can someone help me so I can play X Multiply properly?

[Xyga]

Funny things is that it looks similar to what some of the XRGBs do; leave out a number of lines to output 480p instead of a 'any size doubling'.

You don't give much details on your setup so I don't know your monitor, if it's all-low-res compatible or 480p or both, nor if you're already using a doubler in-between the board and the monitor, but if it's anything like that then it's possible you won't be able to fix it (unless either your monitor or doubler have an option to 'un-mask')

The OSSC should be able to output pure doubling, although I've not heard of someone using it with something like an m72 game on a CRT (the monitor has to display pure 512 vertical resolution) btw do other displays show the same issue? you should absolutely try to compare and narrow-down to the culprit.

Also dunno if you're using a supergun that could be at fault although I wouldn't guess why anyway.

Then I could be all wrong, or it could come from Apocalypse's multi board, in any case you should show him that.

[SuperDeadite]

Don't know about OSSC but on XRGB-2plus, you have to disable the "mask" option. On a standard 2, you are SOL. On the 1/DISPL you always get everything, but some moniters can't cope with it as the doubled res is higher then 480p and becomes out of range.

[Xyga]

yeah confirming, the XRGB-1 (4 pin dip), DISPL, and OSSC are the only arcade-pcb-friendly Micomsoft machines I know are able to display the full doubled resolution.
while the 2+ indeed has an option to disable the masking, it's hardly pcb-friendly (before even monitor specs come into play)

then for all kinds of non-Micomsoft external scalers I don't remember at all, some must be okay with pretty much everything while others could have their limits with what they accept to double (and lock, not even mentioning the scaling and lag there)

in any case for pure doubling it's as you say, beyond scalers, monitors - flat panels or crt's - also have their limits, that's why he must try with various different ones.


EDIT: found an old post in the 'ode' thread suggesting this is a MegaView that lacks 15KHz RGB support, for which Hoag might indeed be using an OSSC.
in which case I see only two possibilities; the MegaView can only display 480 lines from the m72 doubled by the OSSC and therefore by itself cuts off 32 lines to avoid an out of range situation...or for some reason the OSSC cannot output the 512 lines correctly. *scratching head*

[Hoagtech]

Funny things is that it looks similar to what some of the XRGBs do; leave out a number of lines to output 480p instead of a 'any size doubling'.

You don't give much details on your setup so I don't know your monitor, if it's all-low-res compatible or 480p or both, nor if you're already using a doubler in-between the board and the monitor, but if it's anything like that then it's possible you won't be able to fix it (unless either your monitor or doubler have an option to 'un-mask')

The OSSC should be able to output pure doubling, although I've not heard of someone using it with something like an m72 game on a CRT (the monitor has to display pure 512 vertical resolution) btw do other displays show the same issue? you should absolutely try to compare and narrow-down to the culprit.

Also dunno if you're using a supergun that could be at fault although I wouldn't guess why anyway.

Then I could be all wrong, or it could come from Apocalypse's multi board, in any case you should show him that.

My setup is an OSSC on a Mitsibishi Megaview 37" (XC3725C) 31khz+

My supergun is an MK30 Adcap Jansen. I am connected through component and am running it at x2 x3 and x4 scale.

I am trying to unmask with my OSSC but I may need a HAS to be able to do it if I cant figure it out with my current setup. I will try my SONY XE900 and Sony W950b when I get home tonight.

This is what another user (Xtrasmiley) was able to edit with and I am confused on whether these settings are HAS or OSSC:
{QUOTE}
Irem M72 : Dragon Breed =

HAS=TTL, OSSC=Pre/Post Coast 1, 3x mode looks best as it doesn't cut off top or bottom but is 720p and 5x mode is 1080p, however the top and bottom are cut off. Also, bottom layer of this games screen is cut off (score, lives, time layer) at the default settings. To see it you have to adjust the settings under Advance Timing Tweaker. I set Vertical Sync Length to 6, Vertical Backporch Length to 30, and Vertical Active Length to 240. This allows you to see the full bottom line information and graphics, however the top is now cut off a bit. You could cut back on my settings to see the numbers, giving up a little bit of the graphics but gaining back the top line. Your call how you rock this. {QUOTE}

I would love to solve this problem

[Xyga]

Frankly I'm not sure at all the OSSC is to blame, I recommend asking marqs the question as he's certainly the best placed to answer.

If he can confirm it's not the OSSC then it's either your MegaView (#1 suspect as I'm concerned) or something supergun-related although I can't imagine what it would be.

[maxtherabbit]

in the "sampling options" menu of the ossc go to "advanced timing"

adjusting v. backporch in there will move the image up or down

[Hoagtech]

in the "sampling options" menu of the ossc go to "advanced timing"

adjusting v. backporch in there will move the image up or down

Thanks guys. I will try that.

[Xyga]

Yes moving the output up you will eventually recover the bottom bar, but as Xtrasmiley says you will also probably lose the top of the picture.

I'm almost certain the MegaView can't manage the full 512 so it'll only ever show you 480 out of these (your flat panels howerver might be a different story, not sure you gotta try and see)

[Hoagtech]

in the "sampling options" menu of the ossc go to "advanced timing"

adjusting v. backporch in there will move the image up or down

It was a little more than v. backporch.

Here are the sampling changes:

OSSC:

SAMPLING OPTIONS>

ADV. TIMING 240P>

V SYNCLEN 6>

V BACKPORCH 30>

V ACTIVE 240.

[Xyga]

Good! now you know what to do in cases you come across other games that have a vertical resolution higher than 240 (thankfully there aren't that many iirc)

I would have been curious to see how it fares on your flat panels at default settings though, like crt monitors some will display the full height, some will cut off a portion of the picture, some will refuse to show anything.