VGARC, Text-based VGA Adapter for RC2014

VGARC, rev1 replaces the previous exploratory rev0.1 and rev0 prototype designs. VGA rev1 is based on 4K of dual-port RAM shared between RC2014 bus and on-board video display circuitry. The 4K dual-port RAM issplitted into 1K of font tables and 3K of text memory. Both font tables and text memory can be accessed at any time without causing video display flickering.