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Howard M. Harte d0c009504b AltairZ80: Add support for the AB Digital B810.
The AB Digital Design B810 RAM card is a 256K Dynamic RAM card
with onboard refresh logic.  AltairZ80 support emulates four of
these cards for a total of 16 banks.

As used for the OASIS operating system, the B810 is configured
with common memory at the low addresses (0000h-3FFFh) with 16
banks of 48K from 4000h-FFFFh.

In order to have the common memory appear from 0000-3FFFh, set
the COMMONLOW register to 1:

D COMMONLOW 1
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