Seagate ST-506 DIP switch settings needed

From: Don Maslin <donm_at_cts.com>
Date: Sun Dec 27 22:39:53 1998

On Sun, 27 Dec 1998, Jason Willgruber wrote:

> Anyone have the DIP settings for a Seagate ST-506 (full-height 5.25", 5 MB)
> HD? I can't seem to find it on Seagate's website (or am I just looking in
> the wrong place?) I'm trying to set it up as HD [0] on an IBM PC using a
> Western Digital XT-GEN controller. The HD appears to be recognized by the
> controller BIOS to do a LLF, but isn't recognized by MS-DOS FDISK (5.0 - I
> don't have anything smaller on 5.25" disks). It just says "error reading
> Hard Disk". I can only think of two things :wrong jumper settings, or wrong
> interleave setting. When I LLF'ed it, I left it at <3>, which is what was
> the ?default? was set at. Or is the WD-XT-GEN too new of a controller for
> the ST-506 (controller is dated 1987). One last thing: Does anyone have a
> 360k image (or TeleDisk Image) of IBM PC-DOS 3.0 or earlier (If you need a
> copy of TeleDisk, email me, and I can email you a copy).
 
                         ST-506
                   Option Shunt Block
 
                      ____ ____
                      | |__| |
                   1 | R | 16
                   2 | D | 15
                   3 | NC | 14
                   4 | H | 13
                   5 | DS4 | 12
                   6 | DS3 | 11
                   7 | DS2 | 10
                   8 | DS1 | 9
                      |__________|
 
      Legend:
              R Radial Operation
             *D Defeat Recalibration
             *H Half Step Option
              DSn Drive Select
 
             * Factory selection
 
Opening the Half Step option should improve access time.

The proper interleave setting is a function of the controller rather than
the HD, so 3 should be OK.
                                                 - don
Received on Sun Dec 27 1998 - 22:39:53 GMT