<i>The system is fully expandable to 65K, with the entire data and address busses, clocks, control signals ( i. e. IRQ, NMI, DMA, RDY, etc.), and power sources available at the connector.</i><p>Were any of those (few) sold boards ever expanded to the maximum possible RAM? That would be a beast of a machine, for cheap, in 1976.<p>Also: 65K of memory? Not 64K?