[Coco] Dual UART with FIFO Card for the CoCo
gene.heskett at gmail.com
Sun Jun 13 18:37:58 EDT 2010
On Sunday 13 June 2010, sales at gimechip.com wrote:
>On CoCo3.com, I asked for project ideas and requests. One request was for
> a Dual UART card w/FIFO. I thought this would be a good one, so I spent
> yesterday studying the datasheets and then, this morning I created a
> preliminary design using E.A.G.L.E. The complete project is now posted
>-coco Let me know if you spot any potential problems with the design.
>Thanks - John
The only problem I see is the additional i/o addresses it needs. 8 per chip
sure beats the original 16450's 16 per chip, but with the coco's very
limited I/o mapping, at least in os9, finding that space is going to be fun.
In my own situation, I do have a dual port ACIA, addressed adjacent to each
other from FF64 to FF6B (iirc), which meant I had to hack Rogers BT pack to
I would like to ask how much trouble it would be if we could figure out a
way to isolate the first $40 of page $FF by more fully decoding the two
PIA's it uses, so they would not see a /cs except at $FF00-03, and $FF20-23.
That would clear out and make usable a considerable amount of i/o address
space, allowing this to be addressed at $FF10-1F for instance. That would
still leave room for 6 more 4 bit wide devices.
So basically, we first need a kit that will fix all of our coco's, freeing
up this very sorely need i/o space.
I looked at that myself but about 2 decades ago, so any ideas I may have had
then are moot now. And I of course am not the least bit allergic to
plugging in my iron and fixing it as long as I can adequately see what I'm
doing. Diabetes is trying to fix that for me now. But, I'm still a C.E.T.,
so I'd be willing to be a test site, I have more than 1 coco3 here.
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The secret of happiness is total disregard of everybody.
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