[Coco] RGB2VGA in FPGA, useful?

[S Klammer]

Could this be useful in a "v2" of Roy's adapter?

This RGB to VGA adapter was designed upon an Altera FPGA for use with a BBC
Micro (PAL) and has been released as open source.

https://github.com/makestuff/rgb2vga

>From the "ReadMe"...

NATIVE DIGITAL RGB TO VGA CONVERTER

This code accepts a pixel clock, R, G, B, HS and VS from an old computer
and generates a VGA signal suitable for display on a modern monitor. The
main caveat is that monitors to be used with PAL machines must be able to
deal with a 50.000Hz vsync (many do, some do not).

<...>

This will build a .svf file suitable for loading into an Altera EP2C5 FPGA
(e.g http://www.ebay.co.uk/itm/150835820710). Suitable level-shifting is
required to protect the FPGA from any 5V signals. On the VGA side, a series
270R resistor on the R, G & B lines is all that's needed.

Chris McClelland
2013-05-10