You should be able to use system 7 display documentation for a system 6a, as Alien Poker is essentially a System 6 board with System 7 displays (and of course different flipper ROMs to drive the displays).
I have written some production versions of test ROMs for Systems 3,4,6. I also have some beta versions for system 6a, and 7, but I'm not quite ready to publish them yet. If you have access to 2816 chips and a chip programmer I'd be happy to send you the current ROM images for 6a.
The official download site is here: http://pincoder.reversion.ca
Take a look at the .txt files for each test to see if they can do anything to help you.
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