Video Graphics Frame Store

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#1
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Is anyone aware of a video frame store/graphics card that can be hooked up to an AVR? (Yes, I know, it makes no sense to do so but sometimes....)

 

I'm know about PiGFX which uses a Pi as a terminal emulator with some basic graphics primitives. https://github.com/fbergama/pigfx

 

What I'd like is...

 

minimum 640x480, ideal 704/720x576 (ie square pixels)

minimum 8-bit RRRGGGBB output but ideal would be 8:8:8 RGB

something like high-speed SPI access to the frame memory

it doesn't need to be intelligent, just a frame buffer would do

 

I could build one, I've designed plenty of them in the past. I should still have some VRAM and display controller somewhere.

 

I did wonder about getting an 8-bit ISA card and driving that but that all seem to be quite low res.

 

It's for a weird retro-computing idea I have.

 

#1 Hardware Problem? https://www.avrfreaks.net/forum/...

#2 Hardware Problem? Read AVR042.

#3 All grounds are not created equal

#4 Have you proved your chip is running at xxMHz?

#5 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand."

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Brian Fairchild wrote:
(ie square pixels)
Scaling?

If yes then that's what limited the choices in Epson LCD controllers (internal VRAM, external common (router) SDRAM)

Vancouver Design Center - Product Selector (Epson)

Brian Fairchild wrote:
It's for a weird retro-computing idea I have.
Retro look-and-feel or retro make?

Reason : PIC32MZ DA Family | Microchip Technology

If retro make, Electronic Design has a series on the video controller ASICs.

The Graphics Chip Chronicles | Electronic Design

 


HUGE Memory MCU | AVR Freaks

FPGA Microcontrollers | The Western Design Center, Inc. (add your video controller design to the CPU's HDL)

 

"Dare to be naïve." - Buckminster Fuller