[Coco] CoCoFEST! Challenge: CoCo DMA

[James Ross]

RETRO Innovations wrote:
>>>>> http://www.go4retro.com/2020/02/26/direct-memory-access-possibilities-on-the-tandy-color-computer/
>>>> http://www.go4retro.com/2020/02/28/coco-dma-early-efforts/
>>> http://www.go4retro.com/2020/03/05/coco-dma-fighting-on-the-bus/
>> http://www.go4retro.com/2020/03/12/coco-dma-invisible-ram/
> http://www.go4retro.com/2020/03/23/coco-dma-missing-without-a-trace/

Like the others, latest article is fantastic! You do a good job making it sound understandable!

It would have been such a simple revision early on for them to fix that ... it begs the question did they know they were blocking DMA? -- perhaps no one in the original design loop became aware of the problem -- an oversight?  

A fix should be included in any future CoCo3+ and/or CoCo4 new and/or replacement motherboard ...  

-jr