[Coco] Kipper SBC v1 Update

[Kip Koon]

Hi Guys,

I thought that RetroInnovation's suggestion was useful, so I redid the glue
logic and now the Kipper aka Keeper SBC v1 now has these additional features
and if my logic (I miss Nimoy) is correct, it does this with just 8 ICs.

There are now two memory maps available with the ability to disable all ram,
rom and I/O!  This makes the following 3 Memory Maps available to the User.

Grant's Default Memory Map (with a slight twist)

Ram = $0000-$7FFF - 32KB

Open = $8000-$9FFF - 8KB

Serial I/O = $Axxx - 4KB (To keep compatibility with the Original Code)

Open = $Bxxx - 4KB 

Rom = $C000-$FFFF 16KB (Full Rom Available)

Alternate Memory Map 

Ram = $0000-$7FFF - 32KB

Open = $8000-$BFFF - 16KB (If Ram is put here, then 48KB Ram)

Serial I/O = $Cxxx - 4KB

Rom = $D000-$FFFF - 12KB 

Grant's 6809 Extended Basic Interpreter still fits.  Software needs a change
to the I/O to reflect the new Addressing.

And finally the one that some of you were wanting waiting for, the ability
to add Anything!

Open Memory Map

Open = $0000-$FFFF - 64KB

This is achieved by asserting the !BASE_ENABLE pin on the Kipper Bus HIGH.
All Ram, Rom and I/O is disabled and removed from the Memory Map.  Now the
Kipper SBC becomes the Kipper CPU Board Ready for All your design
modifications.  Now What do you think?  

I believe this will be the final configuration for the Kipper SBC v1.  After
I get the green light from my second set of eyes for correctness and
completeness, off to the PCB Fabricator I go. Hi Ho, Hi, Ho, PCB creation I
go.  :)  

Ideas, Suggestions, feature wishes are always welcome.  Thanks for all your
interest!

 

Kip Koon

 <mailto:computerdoc at sc.rr.com> computerdoc at sc.rr.com

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