[Coco] atari USB device

[jdaggett at gate.net]

Mark 

You can do it two or three address spaces and a 256 byte receive 
and transmit buffer to implement this. It can be done via a 
cartdtidge or a memory mapped internal board.

You can do a flip flop like the old SAM chips where a write to the 
odd address sets the "A0" line and a write to the even address 
clears "A0" line. The third location is bidirectional address/data to 
the SL811.

What impacts the glue logic will be how many bytes used to 
communicate to the chip. I suggest that an I/O mapping be used 
and placed within the $FF00 to $FF7F range. 

james


On 17 Nov 2004 at 20:49, Mark McDougall wrote:

Date sent:      	Wed, 17 Nov 2004 20:49:12 +1100
From:           	Mark McDougall 
<msmcdoug at optushome.com.au>
Organization:   	Technetium Development Pty Ltd
To:             	msmcdoug at optushome.com.au,
	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	Re: [Coco] atari USB device
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> Mark McDougall wrote:
> 
> > Surely cartridge space?
> 
> Hmmm, only appears to use 2 bytes of address space!?!
> 
> 
> -- 
> |              Mark McDougall                | "Electrical Engineers
> do it | <http://members.optushome.com.au/msmcdoug> |   with less
> resistance!"
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