JAMMArcade.net – Page 215

Final Rainbow Islands PAL

Feb 082013

I’ve been chatting with Charles MacDonald recently about all things PAL related and have been experimenting with using the ABI to dump combinational PAL’s with 24 pins.
After a fair amount of learning and a lot of trial and error I now have a semi decent way of recreating 24 pin PAL chips.
So, here is my first offering. The last undumped PAL chip from Rainbow Islands.
It is used for some address decoding and lives in a PAL20L8 chip. Its ID is B22-07.

That now makes a full set of PAL’s for Rainbow Islands.
I’ve created this to be programmed to a GAL22V10 device but I can recompile it for a GAL20V8 device if required.
If you try this out please give any feedback you may have.

Thanks to Charles MacDonald for all the help and inspiration you have given me over the last couple of weeks. You have the patience of a saint!

SEGA Tetris repair log

Feb 022013

Got a Tetris that was sold as faulty.
As with pretty much any PCB I buy, a visual check was carried out and straight away I found this capacitor.

The board came with an adapter but looked a mess and the wire was far too thin on the power lines so I swapped it out.
I also found a couple of pins touching in one of the unused connectors

And finally I found the sound pot was no soldered in at all and was missing its ground pin.

I took a pot from an old scrap board and fitted it.

Now it was boot up time.

All looks ok so far, but…..

I initially thought it was a dodgy EPROM but they checked out fine. Then I realised that the EPROM at location B1 on the ROM board was missing.

I burned a new one from the Jap set and now we have this.

Everything seems to be working fine.
This board still has its battery installed in the FD1094 and surely will be coming to the end of its life by now. I don’t trust myself with a battery change but I think I have desuicided ROM’s so will just wait until it dies completely or I will sell it on as I cant imagine wanting to play this in my cab.

New PAL Table now in use

General Comments Off

Jan 312013

I have installed a new Table plugin for the PAL list.
Its very similar to the old one but this one has some bug fixes etc
If you encounter any issues using this please let me know.

Dynasty Wars and Plotting PALs added

PAL Updates Comments Off

Jan 312013

Added two PAL’s. They were made by Macro so thanks goes to him for this.

Dark Seal PALs added

PAL Updates Comments Off

Jan 282013

caius has allowed me to add his dumps from his Dark Seal PCB.
These have been tested and are in GAL16V8 format.

Thanks caius

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