| JA3 Pin: | Function | | -------- | ----------------------------------------- | | A | Horizontal Scan In | | B | Vertical Scan In | | C | Feeds into scan gen earlier than A | | D | Feeds into scan gen earlier than B | | E | Pull down to enable A B inputs | | F | Pull down to enable C D inputs | | H | Horizontal Blank (Scan sweep for display) | | J | Vertical Blank (Scan sweep for display) | | K | Gnd |