CPS1 MERCS freezing

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Rocco
Posts: 249
Joined: February 7th, 2016, 10:51 pm
Location: Navarra

CPS1 MERCS freezing

Postby Rocco » October 29th, 2016, 10:50 am

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I bought this game some months ago , but the lack of TATE cabinet didn't let me play it ...

Game starts normally , credit OK but if I touch TEST or any action buttons , the game gets freeze.


What could be the problem?

I tried 2 CPS Base boards ,same result .
And those base boards works perfect with other games ...
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Asayuki
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Joined: August 29th, 2015, 10:16 pm
Location: Remuria, Germany

Re: CPS1 MERCS freezing

Postby Asayuki » October 29th, 2016, 12:00 pm

The issue is on the B board, where the code EPROMs are. Try carefully reseating them as a first thing. Be warned that the C board has a suicide battery. You don't want to fiddle with it.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
Rocco
Posts: 249
Joined: February 7th, 2016, 10:51 pm
Location: Navarra

Re: CPS1 MERCS freezing

Postby Rocco » October 29th, 2016, 4:18 pm

Asayuki wrote:The issue is on the B board, where the code EPROMs are. Try carefully reseating them as a first thing. Be warned that the C board has a suicide battery. You don't want to fiddle with it.



Do you mean pressing stronger eprom to socket with my fingers ?


Thanks for your help
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nem
Posts: 612
Joined: August 17th, 2008, 6:59 pm
Location: Finland

Re: CPS1 MERCS freezing

Postby nem » October 29th, 2016, 5:03 pm

Reseating means pulling them off and putting them back in.

Is there a chance of it suiciding if the program roms are removed?
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Asayuki
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Re: CPS1 MERCS freezing

Postby Asayuki » October 29th, 2016, 8:33 pm

nem wrote:Is there a chance of it suiciding if the program roms are removed?


AFAIK the battery is only connected to the big QFP chip on the bottom of the C board. Hands off that thing.
However, Leonard is the real CPS expert; please correct me if I'm wrong, pal.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
Rocco
Posts: 249
Joined: February 7th, 2016, 10:51 pm
Location: Navarra

Re: CPS1 MERCS freezing

Postby Rocco » October 29th, 2016, 8:44 pm

Asayuki wrote:The issue is on the B board, where the code EPROMs are. Try carefully reseating them as a first thing. Be warned that the C board has a suicide battery. You don't want to fiddle with it.



Thanks for the hint , do I need to take off the bigger EPROMs and re-install all again ?
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Asayuki
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Joined: August 29th, 2015, 10:16 pm
Location: Remuria, Germany

Re: CPS1 MERCS freezing

Postby Asayuki » October 29th, 2016, 8:51 pm

Yes,
see this page, line 5527:
https://git.redump.net/mame/tree/src/mame/drivers/cps1.cpp
The names of the files will make you understand which are the ROMs to unplug and replug. Be careful not to bend any pin.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
Asure
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Location: Netherlands

Re: CPS1 MERCS freezing

Postby Asure » November 1st, 2016, 9:31 pm

Mercs has no battery on the C board. You want to check 11F, 12F 11H and 12H eproms. They are in a cluster of 4 in the corner below the C board.

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