JAMMArcade.net – Page 180

X Multiply repair log #3

Aug 112014

Yes, again.
During some playing of this recently repaired board the game froze up.
On reset I was greeted with this static screen.

Non booting boards are generally quite easy to fault find but due to the V30 I was having problems. This is when I came across a post on KLOV from some time ago with someone asking if an 8086 Fluke POD could be used to test a V30 based system. The general thinking was that it could but no one ever tried it, until now!
Im pleased to say it does work (excluding the RUN UUT function).

Very quickly I found that the main ROM’s could not be read properly. The correct signature was 6A03 and I was getting 6935.
Following my schematics I found that there is a 74LS373 at location IC51 that is used as the latch to address the ROM’s.

This input was confirmed good but there was a stuck bit on the output.
I replaced this and the game was back once again. Ive left this soak testing and hopefully it will be rock solid now.

So just to confirm. The 8086 pod for a Fluke 9010/9100 can be used to check V30 based systems.

Metamorphic Force PAL dump added

PAL Updates Comments Off

Aug 102014

Today we have the complete set of PALs from Metamorphic Force since I dumped the second and last one.Equations has been compiled by Porchy into a GAL22V10 target device, dump is tested an working.We are cataloging all the Konami PLDs.Currently we are looking for dumps or chips from the following original PCBs:

Gryzor

Super Contra

Final Round

Gangbusters

Thunder Cross

So please let us know if you can provide them.Thanks.

Puzznic PAL dump added

PAL Updates Comments Off

Aug 072014

Today I dumped the only PAL on a original Taito Puzznic PCB.Dump was reversed by Porchy into a GAL20V8 and it’s tested and working.Equation can fit also into a GAL22V10 so you can request it if needed.

Just a curiosity: this PCB is no far the smallest one I ever seen, it’s really tiny!

Cadash PAL dumps added

PAL Updates Comments Off

Aug 062014

I’ve just dumped all the PLDs (four in total) on the Cadash PCB I succesfully repaired.All dumps are working and tested in a GAL16V8 except one which Porchy reversed into a GAL20V8 but its equations can be complied also in a GAL22V10 targeting device.Old PAL archive from unknown source was deleted from database as well.

Cadash repair log #1

PCB Repair Logs, Repair Logs Comments Off

Aug 062014

This one came from the same lot of faulty PCBs (seven in total) as the previously repaired Growl.For the uninitiated, Cadash is an action game with some RPG elements.

Board was in good shape (it has also additional hardware for multi-link game) .

When powered on I got this screen:

There was a clear problem with main code execution so I dumped the four program ROMs and none of them matched the ones in MAME.I ran these dumped ROMs in MAME and I got a similar error (different memory address due not perfect emulation of 68000 core, I guess):

This was enough to lead me to reprogram the four program ROMs from cadash World set into 27C010 devices.And this was the winning move which fixed the board.

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