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From: Kurt Nowak <kurt.m.nowak@gmail.com>
Newsgroups: comp.sys.apollo
Subject: Re: Booting an Apollo with the external scsi connection
Date: Sun, 18 Mar 2012 13:03:03 -0700 (PDT)
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On Sunday, March 18, 2012 11:00:53 AM UTC-7, supervinx wrote:
> Il Sun, 18 Mar 2012 18:07:03 +0100, Lothar Paltins ha scritto:
>=20
> > But it must work. The WD7000 has only one SCSI bus, electrically it
> > doesn't matter whether a device is connected to the internal or externa=
l
> > connector. Of course the SCSI bus must be enabled, the termination must
> > be correct and the termination power must be supplied. And AFAIK, the
> > SCSI address of the tape drive must be 0 to be recognized as dev ct.
> >=20
> > Lothar
>=20
> I used ID 0, but had no luck. May be the drive wasn't suitable for the=20
> Apollo...
>=20
>=20
>=20
> --=20
> http://www.supervinx.com/Retrocomputer

I might be having more luck than Vincenzo, because I at least get tape acti=
vity and a tape sense error upon issuing LD. I have the scsi set to 4 for m=
y Sun chain, so I will change that and see what happens. I have a terminato=
r on the external enclosure, so I am guessing that I dont need to set anymo=
re jumpers? Or perhaps I need to make sure that J10 is NOT jumpered? I will=
 try both and see what happens.

Per T. Hunkler's site:


key:  * =3D pin with jumper block in place
      o =3D bare pin

***SNIP***

W7  o o o o o  [1]             SCSI TAPE Interrupt =3D IRQ5.  Jumper across=
 rows
    o o * o o  [2]             1/2 for ESDI i/f or 2/3 for SCSI i/f.
    o o * o o  [3]
            ^ ---------------- IRQ 9
          ^------------------- IRQ 7
        ^--------------------- IRQ 5
      ^----------------------- IRQ 4
    ^------------------------- IRQ 3

W8  o o o o o   [1]            TAPE DRQ/DACK select. Jumper across rows
    * o * o o   [2]            1/2 for ESDI i/f or 2/3 for SCSI i/f.
    * o * o o   [3]
          ^------------------- DACK 3
        ^--------------------- DACK 1
      ^----------------------- DRQ 3
    ^------------------------- DRQ 1

W9  o o o o o o o *            TAPE I/O address =3D 200
    o o o o o o o *

W10 * *                        SCSI Terminator power, IN =3D powered

-Kurt