MBA_WCSR
MBA_WCSR(MBA_VAR, ((u_int)buf & VAX_PGOFSET));
MBA_WCSR(MBA_BC, (~size) + 1);
MBA_WCSR(MBA_CR, MBACR_INIT);
MBA_WCSR(MAPREG(0), PG_V);
MBA_WCSR(MBA_VAR, 0);
MBA_WCSR(MBA_BC, (~512) + 1);
MBA_WCSR(MBA_CR, MBACR_INIT); /* Reset adapter */
MBA_WCSR(MBA_CR, MBACR_IE); /* Enable interrupts */
MBA_WCSR(MBA_SR, itype);
MBA_WCSR(MUREG(0, MU_AS), attn);
MBA_WCSR(MBA_VAR, ((u_int)bp->b_data & VAX_PGOFSET));
MBA_WCSR(MBA_BC, (~bp->b_bcount) + 1);