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Wonder boy monsterland no sprites

Printed From: ukVac.com
Category: Technical
Forum Name: Tech, Maintenance & Repairs
Forum Description: Need Help? Ask Here
URL: http://www.ukvac.com/forum/forum_posts.asp?TID=361175
Printed Date: 17 Oct 2018 at 3:26pm


Topic: Wonder boy monsterland no sprites
Posted By: Lurch666
Subject: Wonder boy monsterland no sprites
Date Posted: 07 Dec 2017 at 10:42am
I have been looking at a wonder boy in monsterland (Galaxy bootleg I think) that is running fine except a complete lack of sprites.
Have checked the sprite roms and they are fine and further investigation has led me to the theory that the sprites are encrypted and the small daughter board that's plugged into the main board is responsible to decoding.Found the info on a klov thread after I searched pal16r4a:

http://forums.arcade-museum.com/showthread.php?t=41667&highlight=pal16r4a" rel="nofollow - http://forums.arcade-museum.com/showthread.php?t=41667&highlight=pal16r4a

The board looks like this:



The klov thread said something about replacing the board with a jumper board and using an unencrypted version of the sprite roms.
My problem is one of the PAL16R4A on the daughter board has a hole in it so I figure it's busted and that's why the sprites are not being displayed.Since these are like proms that need to be programmed and modern programmers can't handle them does anyone have any experience of replacing either the daughter board or the chip?


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Replies:
Posted By: caius
Date Posted: 07 Dec 2017 at 11:11am
The piggyback board on this bootleg is used to replace custom ICs of original.For sure the missing sprites on your board are caused by the fried PAL16R4.Some time ago I had a faulty WonderBoy Monsterland bootleg :

http://photos.google.com/photo/AF1QipPZ9-xILDuLkBTO3WtDVByh7APeDeDf-2N6gm0T" rel="nofollow - https://photos.google.com/photo/AF1QipPZ9-xILDuLkBTO3WtDVByh7APeDeDf-2N6gm0T


and I was able to dump the PAL16R4  (device was unsecured) on the piggyback board but IIRC it was the little one.I converted the fusemap to GAL16V8 :

http://drive.google.com/file/d/0B0oZORLQc26xUTdYTWJZd0lvMTQ/view" rel="nofollow - https://drive.google.com/file/d/0B0oZORLQc26xUTdYTWJZd0lvMTQ/view


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Caius on http://www.jammarcade.net" rel="nofollow - http://www.jammarcade.net


Posted By: Lurch666
Date Posted: 07 Dec 2017 at 12:56pm


here is my daughter board (plus gaping hole-how did I not notice this earlier?)
Do you think it could have the same fusemap or will that depend on the version of the board?

The maps are on mame I think but I'm having problems identifying my board.
In my first post I said it was a galaxy bootleg but on looking at the three program roms (24512s) they are all 65536 bytes where the galaxy boot uses two 65536 bins and one 32768.
My d2 rom image matches the galaxy.ic90 but the other two don't match anything (not even coming up in romident).
The gecas boot has three 65536 bins but they don't match any of the rom images from my board.

I've ordered some 27c512s to mess around with the program roms but till then I could either have some modded bootleg or my program roms are duff.The game sits in demo mode fine (apart from the sprites) so I'm thinking the code is fine.

Also the first link in your post give me a 404.



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Posted By: caius
Date Posted: 07 Dec 2017 at 1:53pm
Sadly there are no PAL dumps (only BPROMs, they are used for colors) in MAME so you can't repair your board unless you find another same bootleg and dump the device hoping it's not secured.
The link I posted is good, I can view contents of archive.
Try this alternate donwload link:
http://www.mediafire.com/file/y00byf2t5rzisig/WonderBoy_ML_booteg_GAL_IC69_piggyback.zip" rel="nofollow -
http://www.mediafire.com/file/y00byf2t5rzisig/WonderBoy_ML_booteg_GAL_IC69_piggyback.zip" rel="nofollow - https://www.mediafire.com/file/y00byf2t5rzisig/WonderBoy_ML_booteg_GAL_IC69_piggyback.zip


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Caius on http://www.jammarcade.net" rel="nofollow - http://www.jammarcade.net


Posted By: Lurch666
Date Posted: 07 Dec 2017 at 2:00pm
Thanks for that.
Have ordered a GAL16V8 to try with your code.I'm hoping it's the same and it wont harm to try.



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Posted By: Lurch666
Date Posted: 18 Dec 2017 at 3:08pm
GAL turned up today.
tried the code but it's made no difference.

Anyone out there with a bootleg wonderboy in monsterland and the same daughterboard as I posted above?
Could you read the PAL16R4A on it and send me the results so I can see about replacing it with a GAL.

Thanks.


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Posted By: martin8or
Date Posted: 19 Dec 2017 at 8:54am
Is it possible to plug that daughterboard in incorrectly, ie offset by a few pins (socketed or is it soldered in)?

The way that Pal has exploded makes me think that there is a problem with that board and someone removed it, then plugged it back in offset and got the power pins wrong and then destroyed the pal.

Unfortunately there's only the jed file in the download link. If you can use palasm in a dosbox or vitrualbox emulator then palasm can sometimes do a jed to equation conversion, (doesn't always work) then you can check what the gal is doing and confirm it with a logic probe. If you haven't got one then they can be a cheap way to do some troubleshooting. Just search for datasheets and then probe inputs and outputs. I do think there's something else wrong with that board and the exploded pal is secondary to that. Use your multimeter to draw a little circuit diagram, and find everything that pal is connected to.


Posted By: caius
Date Posted: 19 Dec 2017 at 8:56am
Originally posted by Lurch666 Lurch666 wrote:

GAL turned up today.
tried the code but it's made no difference.

Anyone out there with a bootleg wonderboy in monsterland and the same daughterboard as I posted above?
Could you read the PAL16R4A on it and send me the results so I can see about replacing it with a GAL.

Thanks.

Sadly a PAL16RR4 is a registered PLD and, unless it's not secured, it's not easily reproducible.


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Posted By: Lurch666
Date Posted: 19 Dec 2017 at 2:47pm
It is possible that the board could have been plugged in wrong at some point.

The thing is I have no way of knowing the state of the daughterboard.It could be completely fried but it's hard to troubleshoot something if you think one chip is duff.
That's why I'm looking for a good image.Although probing the board for signs of life seems like a good idea.

I know the PAL16R4A might be secured but I'm going on the hope that since it's a bootleg they wouldn't have bothered.
If I find I can't get the info for the chip then I will have to start looking for a working daughterboard or custom sega chips off another board.


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