DE_CONTROL
write_dpr(accel, DE_CONTROL, de_ctrl);
write_dpr(accel, DE_CONTROL, de_ctrl); /* dpr0c */
de_ctrl = read_dpr(accel, DE_CONTROL);
write_dpr(accel, DE_CONTROL, de_ctrl | de_get_transparency(accel));
write_dpr(accel, DE_CONTROL, read_dpr(accel, DE_CONTROL) & ~clr);