DVI-A TO VGA ADAPTER PINOUTS(WIRING DIAGRAM). Oct 25, 2010While I still can't say for sure where that DVI-16 connected in the broken adapter of mine, the upshot of the above appears to be that for VGA adapter purposes, DVI-16-HPD should be grounded, as the whole purpose is to use the analog signal from the DVI-I, not the digital signal. DVI to VGA Conversion on a Budget - Instructables DVI to VGA Conversion on a Budget. While the card is capable of driving two displays, I only had a DVI-VGA adapter and ADC-VGA adapters run $50-100US! I decided that I'd just have to figure out how to wire my own adapter and run it to an unused PCI plate. The following schematic is a DVI-VGA adapter.