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APOCALYPSE Sega System 24 multi kit sale & support

Ape Cosplay said:
Just dump all of them to play it safe.
Yes that game runs off two standard 68000s, protection is on the romboard.
Click to expand...
Had a minute to get back to this @Ape Cosplay
Here's what the pcb looks like before I mess with it, plays as is.
Submit to mame just the two mask and 2 epr?
 

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ForestOfDreams said:
Submit to mame just the two mask and 2 epr?
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Yes please, though labels/markings match what's already in MAME.
I dug a bit into MAME's sources and found there was a dipswitch for 2P/4P mode, and by default (OFF) game is 4P:
PORT_MODIFY("DSW")
PORT_DIPNAME( 0x01, 0x00, "Play Mode" ) PORT_DIPLOCATION("SW2:1")
PORT_DIPSETTING( 0x01, "2 Player" )
PORT_DIPSETTING( 0x00, "4 Player" )
Click to expand...
So maybe by setting SW2:1 to ON game would boot on the multi?
 
So my board is being temperamental now (needs a recap) but I can confirm when it was booting in 2 player with no 3/4 player board jumper 1 was the only one set to on.

So it is worth trying setting the dip 1 to on if someone wishes to play this game.
I personally needed google to translate.

I will see if any data matches mame once I recap and multi this board but it sounds like dip 1 solved the mystery.
 
Well, I turned it off to flip the dip off and now it just boots to a test screen and freezes no matter what position.

Once it works again I will double check.
I am open to ideas to fix.
 
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Okay. So dumped the chips.

Think I found my board fault. Pin 9 bad mask rom?

I was able to get them to dump as a 27c040 by ignoring the fault, nothing else worked and they match the mame source thru the verify function.

Oddly, my 14484 bios has less info than the mame source.

Any ideas how to dump an lattice epm5032 that's not in mame?
I've never dumped a security chip.
 

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ForestOfDreams said:
Okay. So dumped the chips.

Think I found my board fault. Pin 9 bad mask rom?
Click to expand...

That's pin 9 with respect to the ZIF socket on your programmer. So it's pin 1 on your chip. On a regular 27C040 that's the VPP pin which requires around 12V for programming the EPROM. A mask rom wouldn't have any need for that so that pin either has some other function or it's NC. Either way, it's enough to confuse your programmer.
 
ForestOfDreams said:
Any ideas how to dump an lattice epm5032 that's not in mame?
I've never dumped a security chip.
Click to expand...
You can't dump it in a conventional way as it's read protected.
You need to delid it. Since it's a ceramic chip it's quite easy to separate the top, then you need to cover the UVPROM part of the die with opaque nail polish, making sure to leave the security bit exposed. 20mn under UV light will reset it and you'll be able to read the content given you programmer support those chips.
But it's not really needed, all S24 security chips have been dumped (and reversed), I have a friend who can provide a replacement if you prove you own an OG board (we want to avoid wild conversions sold as orginals).
 
Well, it is potentially dead because now the board won't boot, but I am also getting the multi soon so no big deal.
If the chips are dumped already I won't bother with it. Just wanted to contribute if not.
 
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