This project is a VGA card for Apple II computers to ouput a crisp RGB signal to a VGA monitor instead of having to rely on the composite output. This is accomplished by snooping the 6502 bus and creating a shadow copy of the video memory within a Raspberry Pi Pico, then processing the raw video memory contents to output a "perfect" signal.
- Generates a 640x480@60 VGA signal with 3 bits per color channel using resistor DACs
- Text mode (monochrome)
- Lo-res mode with no color fringing between the chunky pixels
- Double Lo-res mode (Apple IIe only)
- Hi-res mode with simulated NTSC artifact color
- Double Hi-res mode (Apple IIe only)
- Mixed lo-res and hi-res modes with monochrome text and no color fringing
- 80 Columms text support (Apple IIe only)