I've finally got everything working at 4Mhz and almost working at 6Mhz.
I improved the routing of supplies and decoupling on the memory board (that actually made things worse!)
I added pull up resistors to the memory data lines (buffered) on the memory board and all is now well.
The thing seems to clock up to 6Mhz but then crashes at exactly the same point each time I reboot so it could be a memory/speed issue or it could just be a bug in my transmit code that is only showing up at higher speeds....
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looking good dom.
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