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[MbeeTech]

Thanks Ewan, I have changed my setup. A subsequent question now arises. Is 51h used in non ROM models for anything?

Because the lower [A2..0] address lines are not decoded, the port selects are in groups of 8 addresses and in the case of port 50h, any port access in the range 57h..50h 
will be decoded as port 50h.  This is the way it is on the 128k DRAM coreboard.