Greetings, Atarians. I have a vexing problem I would appreciate some assistance on.     I've been having myself a good time installing a batari/longhorn engineer designed 7800 video board into my personal "keeper" 7800 unit.         I purchased it from "electronicsentimentalities," a member here who has taken batari/longhorn's open-source design and crafted some nice boards:   http://electronicsen...led%20Mods.html   And, his instructions are quite easy, too:   http://electronic