Re: Banked CP/M 3.1 on Apple //e?

["RedskullDC" <redskulldc@DESPAM.yahoo.com.au>]

Hi Steve,

"Steve Nickolas" <uNsOoStPsAuMkSi@verizon.net> wrote in message
news:Pine.LNX.4.44.0312221333060.23377-100000@localhost.localdomain...
> There is an unbanked "56K" CP/M 3.1 for the Apple //e out.  That's not a
> lot of memory and I was thinking about the possibility of modding the
> system to support the extra memory on the 128K //e, including possibly the
> RAM Works, and perhaps using that functionality to add additional support
> to CP/M for some block devices such as 3.5" disks (perhaps this will be
> useful when the EMU][ Z80 is up to par)...
>
> Unfortunately when it comes to stuff I'm a n00b and not familiar with Z80
> at all. :( So it's just a pipe dream... :(
>
> -uso.

Shouldn't be too difficult.

Things to keep in mind:

Control registers for the memory card(s) will not be in the $C000 space due
to the Z-80's address line translation (Microsoft card anyway, not sure
about some
of the others: Starcard etc.)

Need to ensure that Bank 0 , pages 0 and 1 (6502) are not switched out when
the
6502 'wakes-up' to do a memory refresh.

Likewise, your video routines will need to be smart enough to bring in the
appropriate
memory banks if you are using Apple2e 40 or 80 column mode. Probaby best to
keep track in the BIOS of what bank is currently switched in.

Using a videx or similar 80 column card would be a damn sight easier to
implement
with multiple memory banks.

Good luck,
Red