CCS_INTERRUPT_MASK
reg8 = read_ccs_uint8(ice, CCS_INTERRUPT_MASK);
write_ccs_uint8(ice, CCS_INTERRUPT_MASK, 0xEF);
int_status = read_ccs_uint8(midi->card, CCS_INTERRUPT_MASK);
write_ccs_uint8(midi->card, CCS_INTERRUPT_MASK, int_status);
int_status = read_ccs_uint8(midi->card, CCS_INTERRUPT_MASK);
write_ccs_uint8(midi->card, CCS_INTERRUPT_MASK, int_status);