> > the only problem I can see is the Dynamic RAM refresh circuitry. Anyone > know any reference text that's perfect for the job? >
Yes - I shall see if I can find the damned book again. Would you refresh all addresses in one chunk, pausing the processor for a moment, or interleave it with the genuine memory fetches - like the z80's 7-bit refresh does at the moment? If the latter, then you may be able to derive the extra 3 bits usind a divider - but then the gaps between the refreshes may be too long. I dunno.
