PIO
EPKT_DESC(PORT, PIO, IRR, RCA, WRITE),
EPKT_DESC(PORT, PIO, IRR, RUR, WRITE),
EPKT_DESC(PORT, PIO, IRR, INV, RDWR),
EPKT_DESC(PORT, PIO, IRR, TO, READ),
EPKT_DESC(PORT, PIO, IRR, TO, WRITE),
EPKT_DESC(PORT, PIO, IRR, UC, IRR),
{"PIO", PIO},
#define DEV_FUNC_SR_REG (PIO + 0x10000)