VGA Primer for generating video signals



http://www.nathandumont.com/node/241

Wow, we probably should set up a section of the website for things like this, which although are not absolutely 65-family related, are definitely related to the projects we take on with the 65 family! I added it to my own bookmarks. Thanks.

http://elm-chan.org/works/crtc/report.html

the Elm Chan CPLD VGA controller. Should be easily interfaceable to the C02 bus...

_________________
"My biggest dream in life? Building black plywood Habitrails"

Nathan applied his VGA primer to hardware which includes the ChipKit Uno32. It isn't FPGA but some of the hardware to his pong demo could be applied to FPGA:

http://www.nathandumont.com/node/242

He has other VGA projects.

ChipKIT: Conway's Game of Life on VGA

http://www.nathandumont.com/node/244

I don't know a whole lot about electronics even though I've been reading about different hardware for three years. I seek having different solutions which includes video for microcontrollers, the 6502 and its compatibles.

Some projects using only TTL logic chips to produce VGA video signals:

https://hackaday.com/2015/10/15/spit-ou ... gic-chips/

https://hackaday.io/project/20334-bread ... l-and-sram

https://hackaday.io/project/20161-bread ... and-eeprom

http://www.pyroelectro.com/projects/mas ... ideo_card/

Here is a VGA timing calculator I wrote when I made Vulcan-74...

[url]lucidscience.com/temp/VGA.exe[/url]

Just set the clock to what you are using, and it does the rest.

I also made an NTSC calculator for my current JetPack project...

[url]lucidscience.com/temp/NTSC.exe[/url]

Brad

The Rockwell 6545AP can be made to do VGA timing. A normal 6545 or a 6845 is a little too slow, but the AP version of the Rockwell 6545 is fast enough. It's mainly designed for text displays but can be made to do graphics as well. As it's only really a timing generator chip you can widen the bus width of the video ram to more than 8-bits and add more colours or text attributes.

Here are some nice tutorials I found for generating VGA with Verilog.

https://timetoexplore.net/blog/arty-fpga-vga-verilog-01

_________________
Cat; the other white meat.