[Coco] [Color Computer] USB project

[jdaggett at gate.net]

John

I see no real problem with CPLDs or the likes. Cost wise they are 
not that much. Software to configure them and write to the CPLDs is 
free. To configure is not much more difficult than drawing a 
schematic of the logic that you want. 

The only real drawback that I see with CPLDs is the very large ones 
(high gate count) are available in surface mount packages only.  


james

On 29 Jul 2005 at 15:24, John R. Hogerhuis wrote:

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From:           	"John R. Hogerhuis" <jhoger at pobox.com>
Date sent:      	Fri, 29 Jul 2005 15:24:37 -0700
Subject:        	Re: [Coco] [Color Computer] USB project
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> On Fri, 2005-07-29 at 22:48 +0100, Phill Harvey-Smith wrote:
> > John R. Hogerhuis wrote:
> 
> > > If some kind of PLD, you could always defer this question and use
> > > whatever mmio you need for now.
> > 
> > I believe when we discussed this a while back he said he wanted to
> > use standard LS type logic to make it easier for the home constuctor
> > to build as you don't need custom programmers etc.
> > 
> 
> That's my recollection too (seems I remember ideas I disagree with
> better than those where I agree). But I have half a memory of him
> changing his mind, probably wrong, which is why I asked.
> 
> In any event, this kind of issue can be deferred when you do all logic
> aside from power stuff in the CPLD or FPGA. We've been using CPLD in
> our hobbyist project at http://bitchin100.com/remem_project.htm . But
> we have to since our board has to be crammed into a TRS-80 Model 100.
> Also we need several surface mount parts in any event.
> 
> -- John.
> 
> 
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