[Coco] GIME text modes and font data

Mark McDougall msmcdoug at iinet.net.au
Tue Sep 4 07:15:44 EDT 2012

On 4/09/2012 12:00 PM, John Kent wrote:

I have what I believe is a fully-functional 6847 in my FPGA Coco (1) design 
(which I still haven't gotten around to 'officially' releasing since I have 
a few niggly bugs with the Coco emulation...). It can output both composite 
(15kHz) and VGA (31kHz) video as it has an internal line buffer.

The internal clock is fixed (14M318Hz) - different resolutions are achieved 
by simply increasing/reducing the number of bits per pixel. So there's no 
clock division per-say within the device, though I do latch data and shift 
rather than re-sample every clock where possible.


|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"

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