the heart of the VGA chipset was a custom ASIC, a crystal, a bit of video RAM, and a digital to analog converter. This basic setup would be found in nearly every PC for the next 20 years ...

This library allows VGA output using a simple resistor based DAC (3 resistors for 8 colors; 6 resistors for 64 colors), and includes functions for PS/2 mouse and keyboard input, a graphics library ...