[Coco] memory expansion, SPI interface with VGA output

[Ed Snider]

There is also the CoCoVGA which can be used on nearly any MC6847 based machine.

www.cocovga.com <http://www.cocovga.com/>

There are also projects adding support for the CoCoVGA’s 64 column mode in both OS-9
and Fuzix using the Mooh.

Ron Klein recently posted on the Facebook group showing this (Mooh/CoCoVGA/OS-9/Fuzix/64 col).

- Ed


> On May 1, 2019, at 7:36 AM, Henri Mainville <henrymainville at gmail.com> wrote:
> 
> Sounds like a lot to ask for, and who has it all ? I think Tormod's MOOH <http://tormod.me/mooh.html> might have provided enough functionality to make it possible.
> 
> Thanks to the work of Tormod, CoCo/Dragon users can get a memory expansion board with an SPI and MicroSD interface which helps greatly if you want expanded functionality and ease of development on the CoCo/Dragon.
> 
> In the mean time, there's a project I've been keeping my eye on which has been the VGATonic <https://hackaday.io/project/6309-vga-graphics-over-spi-and-serial-vgatonic>, serial VGA graphics module which is targeted towards microcontrollers and embedded devices with exposed SPI or TTL interfaces and capable of driving a display at 640x480 <https://hackaday.io/project/6309-vga-graphics-over-spi-and-serial-vgatonic/log/20001-hardware-accelerated-lower-resolutions-working>depending on your serial speed.
> 
> I think these two modules might make the perfect combo for modernizing 6809-based computers like CoCO/Dragon but it might need a bit of dev work on drivers for NitrOS-9 or FUZIX to detect the SPI interface and drive the video module connected to it.
> 
> I don't know for sure if it's even feasible but I would think so and I also wanted to share incase anyone else was curious.
> 
> 
> Have a nice day and happy hacking!
> 
> 
> Sincerely,
> 
> Henri Mainville
> 
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco