[Coco] Coco proto board

[jdaggett at gate.net]

Mark 

This was discussed a while back and the community then was split between 
using discrete logic versus CPLD for address decoding. A part of the 
community sees a CPLD as fixed address range and somewhat inflexible. 

just my thoughts on this

james

On 14 Sep 2007 at 17:32, Mark McDougall wrote:

> Hi,
> 
> I'm toying with the idea of producing a coco 'prototype' board that
> plugs into the cartridge connector slot.
> 
> I'm thinking of putting a MAX3000A CPLD on there to handle both
> address decoding and allow programmable I/O. It will also have a ROM
> socket and a 'proto area'. Build option will be clocked by E/Q or
> on-board clock.
> 
> Question:
> 
> Which address lines should I route to the CPLD for decoding? I was
> thinking perhaps the top few lines and the bottom few... what would be
> the best mapping options for such a board?
> 
> And any other options that would be nice?
> 
> FYI: we're getting another (non-coco) PCB (2-sided) done and I thought
> we could fill out the panel with a handful of these boards... so it's
> not definite yet... just a thought atm...
> 
> Regards,
> 
> -- 
> |              Mark McDougall                | "Electrical Engineers
> do it |  <http://members.iinet.net.au/~msmcdoug>   |   with less
> resistance!"
> 
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