15 Sep
2006
15 Sep
'06
9:35 p.m.
I've been going crazy here trying to get a burner working. One flat-out won't
see a disc, even though I bought that one brand new (though that was a while
ago and I made the mistake of continually using it for a CDROM drive as
well), another one has mechanical problems, and then there's this external
unit...
It's a Yamaha CRW4260tx. I don't have a cable to connect from it to the
Adaptec 2940 card that's installed in the machine. I currently have a 50-pin
cable running from the inside connector on the Adaptec card to the internal
connector on the drive (with its cover off).
I'd like to put the drive in the box. Right now for both device number and
termination these functions are handled by the external drive's box, on the
rear panel.
Can any of you guys help me with whether jumpers need to be _on_ or _off_ a
pair of pins to make termination happen and to assign a device number? I'd
measure it with a meter but don't have any handy means to get into those
connectors at the moment...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
15 Sep
15 Sep
9:43 p.m.
----- Original Message -----
From: "Roy J. Tellason" <rtellason at verizon.net>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Saturday, September 16, 2006 12:35 AM
Subject: SCSI CD burner
I've been going crazy here trying to get a burner
working. One flat-out
won't
see a disc, even though I bought that one brand new
(though that was a
while
ago and I made the mistake of continually using it for
a CDROM drive as
well), another one has mechanical problems, and then there's this
external
unit...
It's a Yamaha CRW4260tx. I don't have a cable to connect from it to the
Adaptec 2940 card that's installed in the machine. I currently have a
50-pin
cable running from the inside connector on the Adaptec
card to the
internal
connector on the drive (with its cover off).
I'd like to put the drive in the box. Right now for both device number
and
termination these functions are handled by the
external drive's box, on
the
rear panel.
Can any of you guys help me with whether jumpers need to be _on_ or _off_
a
pair of pins to make termination happen and to assign
a device number?
I'd
measure it with a meter but don't have any handy
means to get into those
connectors at the moment...
If you are using a 50 pin cable from the internal scsi card to the drive
directly the terminators on the back of the external case are not connected
to anything.
There are 3 sets of jumpers on the back of the cdrw for SCSI ID, then
probably one for parity or something, then the next one should be labled
terminator (jumper that). If it is the only drive on the cable none of the
SCSI ID jumpers need to be connected and it will show up as SCSI ID 0.
10 p.m.
On Saturday 16 September 2006 12:43 am, Teo Zenios wrote:
----- Original Message -----
From: "Roy J. Tellason" <rtellason at verizon.net>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Saturday, September 16, 2006 12:35 AM
Subject: SCSI CD burner
There aren't terminators on the back of the external case, just a switch,
which connects to a pair of pins on the back of the drive -- those pins
either need a jumper or they don't, I'm just not sure which.
I've been going crazy here trying to get a
burner working. One flat-out
won't see a disc, even though I bought that one brand new (though that
was a while ago and I made the mistake of continually using it for a CDROM
drive as well), another one has mechanical problems, and then there's
this external unit...
It's a Yamaha CRW4260tx. I don't have a cable to connect from it to the
Adaptec 2940 card that's installed in the machine. I currently have a
50-pin cable running from the inside connector on the Adaptec card to the
internal connector on the drive (with its cover off).
I'd like to put the drive in the box. Right now for both device number
and termination these functions are handled by the external drive's box,
on the rear panel.
Can any of you guys help me with whether jumpers need to be _on_ or _off_
a pair of pins to make termination happen and to assign a device number?
I'd measure it with a meter but don't have any handy means to get into those
connectors at the moment...
If you are using a 50 pin cable from the internal scsi card to the drive
directly the terminators on the back of the external case are not connected
to anything. There are 3 sets of jumpers on the back of the cdrw
for SCSI ID, then
probably one for parity or something, then the next one should be labled
terminator (jumper that).
I don't recall if there's a parity jumper there or not but the drive itself is
marked, they just don't express the sense of the pins.
If it is the only drive on the cable none of the SCSI
ID jumpers need to be
connected and it will show up as SCSI ID 0.
That's the part I was wondering about...
Thanks.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
16 Sep
16 Sep
4:31 a.m.
"Roy J. Tellason" <rtellason at verizon.net> wrote:
Don't ignore what he wrote with respect to debugging: simplify everything
until you've only got the host adapter and the drive. Ideally
with only a piece of ribbon cable between the two. You will probably
discover that with a short cable that it doesn't matter whether termination
is installed or not! (Although your Adaptec host adapter will probably
complain at boot time if termination is not correct.)
This brings up what is probably a more on-topic issue: I've never had
a CD burner (SCSI, IDE, whatever) last more than a year or two. Even if
only lightly used. Inevitably I just toss it and buy a faster one for
less $ than the first one cost.
Once or twice I opened it up and removed dust-bunnies but this never
helped.
Is there something I should be doing to preserve "classic" computer
CD readers/burners?
I will admit that I have vengefully destroyed some very classic CD
readers (e.g. RRD50) purely out of spite for how dreadfully poor
performing they were. (A RRD50 is very optimistically "0.5X"). I
did the same with lots of RD5x MFM drives in the late 80's/early 90's,
oh how I despised RQDX/MFM hardware compared to the Emulex/Dilog/
CMD/etc. clones!
Tim.
There aren't terminators on the back of the
external case, just a switch,
which connects to a pair of pins on the back of the drive -- those pins
either need a jumper or they don't, I'm just not sure which.
Almost always, "jumper on" means "termination on".
I don't recall if there's a parity jumper
there or not but the drive itself is
marked, they just don't express the sense of the pins.
Parity jumpers on SCSI CD-ROM's are a crapshoot with respect to sense
of installed/uninstalled.
If it is the
only drive on the cable none of the SCSI ID jumpers need to be
connected and it will show up as SCSI ID 0.
That's the part I was wondering about... 
2:59 p.m.
On Sat, 16 Sep 2006, Teo Zenios wrote:
There are 3 sets of jumpers on the back of the cdrw
for SCSI ID, then
probably one for parity or something, then the next one should be labled
terminator (jumper that). If it is the only drive on the cable none of the
SCSI ID jumpers need to be connected and it will show up as SCSI ID 0.
Which will not work well if the controller thinks that it is number 0.
I have seen various "default" numbers for the controllers on PCs.
What is the default SCSI ID for the controller in Apples?
"Who is number one?"
"You are number six."
7002
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cisin＠xenosoft.com -
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teoz＠neo.rr.com