Not sure about this one.
The board is good for nothing, looks like its had liquid spilled on it a long time ago and there is green gunk everywhere.
There is not much on the board that works but this GAL appears to be unlocked.
Its a GAL22V10 found on the daughter board, it may come in useful for someone.
On the motherboard of the System 16B there is a couple of PLDs.
315-5213 is a PAL16R6, mine is locked and im not going to attempt to reverse it
315-5214 is a CK2605 chip which I have dumped and converted it to fit in a GAL16V8 device. I have confirmed this is working.
There is a PAL located at U9 and marked as DEC402 (on my board) inside the BM4000 unit.
I have dumped and tested this PAL.
Without the PAL fitted I got no boot up and an almost yellow looking screen with some lines through it
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!
Added two PAL’s. They were made by Macro so thanks goes to him for this.