[Coco] External CHAR ROM for 6847

[RETRO Innovations]

On 10/19/2024 7:23 PM, CoCo Demus via Coco wrote:
> I bought this lowerkit for dragon32, it works. I put on my coco1:
>
> https://dragonpluselectronics.com/product/lower-case-text-upgrade-for-dragon-32-64-200-kit-version-2023/

Thanks for the link.  As Tim notes below, the manual had the schematic,
but it eschews the design shown in the 6847 datasheet for one that uses
more ICs (5 versus 3 glue logic shown in the the Dragon one)  So, though
I now have the schematic, I am even more curious why Dennis (our list
maintainer, I believe) did not use the datasheet design.

Jim

>
>
> On Fri, Oct 11, 2024 at 8:47 PM tim lindner via Coco <coco at maltedmedia.com>
> wrote:
>
>> On Fri, Oct 11, 2024 at 6:52 PM RETRO Innovations via Coco
>> <coco at maltedmedia.com> wrote:
>>> Anyone have knowledge of how this works, or a project schematic that
>>> shows it?  Ed made a repro a number of years ago, but no schematic I can
>>> find.  And, I don't see any open source "lowerkit" project to better
>>> understand it.
>> The LowerKit manual may have the Info you need.
>>
>>
>> https://colorcomputerarchive.com/repo/Documents/Manuals/Hardware/Green%20Mountain%20Micro%20-%20Lowerkit_Manual.pdf
>>
>> --
>> tim lindner
>>
>> "Proper User Policy apparently means Simon Says."
>>
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>>

--
RETRO Innovations, Contemporary Gear for Classic Systems
www.go4retro.com
store.go4retro.com