Initializer
init(mem_start:mem_end:base_addr:irq:dma:port:)
init(mem_start: UInt, mem_end: UInt, base_addr: UInt16, irq: UInt8, dma: UInt8, port: UInt8)Initializer
init(mem_start: UInt, mem_end: UInt, base_addr: UInt16, irq: UInt8, dma: UInt8, port: UInt8)