ZN-2 game board EPROM original/replaced

PCB problems and fixes
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Freeman515
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Joined: January 14th, 2018, 3:20 am
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ZN-2 game board EPROM original/replaced

Post by Freeman515 »

Hi guys!

I started to be interested by ZN-2 games especially Rival Schools and I noticed that for many game boards the EPROM 4 (originally labeled "JST04 capcom") looks like replaced or reprogrammed.
For instance I own an Asian Rival Schools board with all the original labels (game name, JST02, JST03) except for the "JST04" label which is missing but the EPROM itself looks like original because the brand is the same than for the JST03 (marked "ST Singapore" or something like this).
On the other hand I recently saw another Asian version where the EPROM 4 is branded with something like "MX Philippines" (so completely different from the other EPROMS) but the label is the original "JST04 capcom" (maybe original label stuck on a replaced EPROM???).

I'm not expert in ZN-2 and it's quite difficult to find information about ZN2 game boards so I'm a bit lost...
I don't know which board is original or not :crazy:
Was it common to replace or reprogram ZN-2 EPROM? and Why?

If somebody could help me to understand... :awe:

Thanks!
Layer
Posts: 162
Joined: March 6th, 2013, 5:38 pm
Location: France

Re: ZN-2 game board EPROM original/replaced

Post by Layer »

Slt,

Ca n'a aucune importance la provenance et la marque (MX, ST...), ce sont des originaux, et les boots sont une minorité, voire quasi-inexistants, sur ce hardware.

Plus d'infos sur les chips de protections et les game boards Capcom au début du driver Mame : https://git.redump.net/mame/tree/src/ma ... ers/zn.cpp
Freeman515
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Joined: January 14th, 2018, 3:20 am
Location: France
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Re: ZN-2 game board EPROM original/replaced

Post by Freeman515 »

Merci pour l'info et le lien.
J'ai cependant vu que l'EPROM 4 était parfois remplacée afin de changer la region du jeu (ce qui pour moi n'en fait plus "vraiment" un original mais plus une version "modded"...) :eh:
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