[Coco] MC6847 External Character ROM

[Zippster]

Anyone have any suggestions for memory locations to decode for IO
to sich a setup?  Is there any room amongst the IO devices on the main board?
I don’t want to interfere with anything.

I’d like to stay away from SCS* and CTS* if I can to avoid conflicting with peripheral cards.

I’m looking for 7 bytes if I can get it.

- Ed

> On Jan 16, 2015, at 8:15 PM, Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com> wrote:
> 
> I a nice improvement would be using SRAM and allowing the coco to change it
> on the fly using some port. The SRAM would be dumped from ROM upon reset.
> 
> Just in case you end up without any other project ;)
> 
> 
> 
> Luis Felipe Antoniosi
> 
> 
> 
> On Fri, Jan 16, 2015 at 9:02 PM, Zippster <zippster278 at gmail.com> wrote:
> 
>> The earlier style (USA) CoCo2’s are socketed that I’ve seen.
>> A lot of the later (Korean) ones would need a socket installed.
>> 
>> - Ed
>> 
>> 
>>> On Jan 16, 2015, at 7:49 PM, Allen Huffman <alsplace at pobox.com> wrote:
>>> 
>>>> On Jan 16, 2015, at 7:42 PM, Zippster <zippster278 at gmail.com> wrote:
>>>> 
>>>> I’ve got my External Character ROM prototype for the MC6847 working.
>>>> There’s a few pics I put up here if anyone is interested in taking a
>> look.
>>> 
>>> 
>>> Wow. That takes me back. I need to crack open my CoCo 1 and see what
>> model lowercase mod I had in it. It wasn’t the big brand — something
>> cheaper… That’s really neat. I think my VDG was socketed on the CoCo 1.
>>> 
>>> I assume later CoCo’s had it soldered to the motherboard? Soldering
>> would be required to install?
>>> 
>>> --
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>> only)
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