Here is a patch for making tape drive to work fine, and, yes, It's now 
working very fine!!

I found that the "SANKYO" unknown drive was very similar to my "ANRITSU"
drive, and my patch-work was done very easy.  Thank you for the leadable
/*comments*/ written by Mr. mycroft! 


p0 0:08 mathom[18] diff -c st.c.original st.c                         /sys/scsi
*** st.c.original       Sun Mar 26 00:08:19 1995
--- st.c        Sat Mar 25 23:58:01 1995
***************
*** 155,160 ****
--- 155,169 ----
            {0, 0, QIC_120}                             /* minor 12-15 */
        }
      },
+     {"ANRITSU ", "DMT780   ", "????",
+         0, 0,
+         {
+             {512, ST_Q_FORCE_FIXED_MODE, 0},            /* minor 0-3 */
+             {512, ST_Q_FORCE_FIXED_MODE, QIC_525},      /* minor 4-7 */
+             {0, 0, QIC_150},                            /* minor 8-11 */
+             {0, 0, QIC_120}                             /* minor 12-15 */
+         }
+     },
      {"ARCHIVE ", "VIPER 150", "????",
        0, 12,
        {
p0 0:08 mathom[19]                                                    /sys/scsi

--
kawahara taro   -- i'd ver-upped from 386bsd(^_^); to netbsd,
                   i felt what a HUGE change had done!