[Coco] 6 Chip ^809 Computer -> Kipper SBC

[Bill Nobel]

Hi Kip is a/the MMU going to be after the Kipper bus or will it eventually be embedded on the main board?  I have come across a MMU circuit (similar to a 74LS612 type MMU) that will map up to 16MB of memory on a 8 bit bus, using off shelf parts.  I’m still interpreting the logic, but I was wondering the future plan for the bus.  It currently adds 10 chips to the board for the 128 MMU registers, but needs a bit more addressing logic for the mapping of the extra 8 address lines to the 6809/6309.  I think the logic does 64k pages from what I deciphered so far.

I am incorporating your Kipper bus onto my own design (combined with parts of Simons board) that will contain the MMU once I complete the breadboarding.

This MMU I will state IS NOT compatible with the Gime in Coco3, but gives an alternative for more RAM on the SBC.

Bill Nobel

> On Mar 10, 2015, at 11:01 PM, Kip Koon <computerdoc at sc.rr.com> wrote:
> 
> Hi Guys,
> 
> The 6 Chip 6809 Computer is now called the Kipper SBC.  
> 
> The current version of the 6 Chip 6809 Computer is now called Kipper SBC v1.
> 
> 
> Kipper SBC v1.1 now has the 74LS04N and resister to control RTS on the
> RS-232 port per Grant Searle's instructions.
> 
> Now I will start designing the Terminal and Keyboard PCB.  I originally
> envisioned a multi-PCB Kipper computer.  I'm not sure yet if this will be an
> add on PCB or be put on the Kipper SBC PCB itself so off to Eagle Pro I go.
> :)  
> 
> 
> 
> Kip Koon
> 
> <mailto:computerdoc at sc.rr.com> computerdoc at sc.rr.com
> 
> <http://www.cocopedia.com/wiki/index.php/Kip_Koon>
> http://www.cocopedia.com/wiki/index.php/Kip_Koon
> 
> 
> 
> 
> 
> 
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