zsmctl
(void) zsmctl(zs, ZS_ON, DMSET);
(void) zsmctl(zs, ZS_OFF, DMSET);
(void) zsmctl(zs, dmtozs(*(int *)mp->b_cont->b_rptr),
(void) zsmctl(zs, dmtozs(*(int *)mp->b_cont->b_rptr),
(void) zsmctl(zs, dmtozs(*(int *)mp->b_cont->b_rptr),
(void) zsmctl(zs, ZSWR5_DTR, DMBIC);
(void) zsmctl(zs, dmtozs(mlines), DMSET);
(void) zsmctl(zs, dmtozs(mlines), DMBIS);
(void) zsmctl(zs, dmtozs(mlines), DMBIC);
zstodm(zsmctl(zs, 0, DMGET));
(void) zsmctl(zs, ZS_OFF, DMSET);
(void) zsmctl(zs, ZS_ON, DMSET); /* raise dtr */
(void) zsmctl(zs, ZS_ON, DMSET); /* raise dtr */
(void) zsmctl(zs, ZS_OFF, DMSET); /* drop dtr */
(void) zsmctl(zs, ZS_ON, DMSET);
(zsmctl(zs, 0, DMGET) & ZSRR0_CD))
(void) zsmctl(zs, ZSWR5_DTR, DMBIS);
(void) zsmctl(zs, ZSWR5_DTR, DMBIC);
extern int zsmctl(struct zscom *zs, int bits, int how);