sclp_early_setup
if (sclp_early_setup(0, &have_linemode, &have_vt220) != 0)
sclp_early_setup(1, &have_linemode, &have_vt220);
sclp_early_setup(0, &have_linemode, &have_vt220);
sclp_early_setup(1, &have_linemode, &have_vt220);