IER0
sca_out(0x48, IER0, port); /* TXINT #0 and RXINT #1 */
sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C),
IER0, card); /* TXINT and RXINT */
sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0),
IER0, card);
sca_outl(sca_inl(IER0, port->card) |
(port->chan ? 0x08002200 : 0x00080022), IER0, port->card);
sca_outl(sca_inl(IER0, port->card) &
(port->chan ? 0x00FF00FF : 0xFF00FF00), IER0, port->card);
#define sca_flush(card) (sca_in(IER0, card))