Oddly the 720K drive which was working, wasn't working this morning. One of those red-herrings which throw you off!
So I have delayed ST_AS by another CPU clock cycle.. So now I have..
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AS1.CK = CLK8; AS1.D = CPU_AS # !ST_BGACK ; AS2.CK = CLK16; AS2.D = AS1 # CPU_AS # !ST_BGACK ; // have to use this to prevent floppy format issues ST_AS.AR = !RESET; ST_AS.CK = CLK16; ST_AS.D = AS2 # CPU_AS # !ST_BGACK ; ST_AS.OE = ST_BGACK ;
Before I was only using AS1 for the ST_AS.D input, now its AS2 and the issue seems to be resolved
Crappy cam video .. ( I can't hold the cam and use keys to move the mouse at the same time!)