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LVD-adapted drive and SCSI Voodoo question [message #283266] Sat, 31 January 2015 23:38 Go to next message
Scott Holder is currently offline  Scott Holder
Messages: 32
Registered: August 2012
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Hey folks,

Recently picked up an 18gb LVD SCSI drive from a Sun machine for my
LC475. Already had an adapter kicking around, so I now have it adapted
to the classic 50-pin SCSI. The problem is it only works when I have
something terminated plugged into the external SCSI. I recently also
found a 50-pin inline active SCSI terminator that plugs into the ribbon,
but it doesn't make a difference. Just the flashing ?. If I plug in my
external whatevers (CDROM, other HD, doesn't matter) while it's on (yes,
I know that's a Very Bad Thing, but it was for Science!) then it
immediately picks up and runs no problem.

Does anyone have any suggestions for getting this working with the
single drive? There is a jumper on the drive for Force Single Ended
which some internet googlings suggested may help, but to no avail. Sadly
it's the only working LVD drive I have so I can't try another to see.
It's not a huge deal keeping a CDROM plugged in, but I'd rather not be
tied to it.

Scott

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Re: LVD-adapted drive and SCSI Voodoo question [message #283267 is a reply to message #283266] Sat, 31 January 2015 23:40 Go to previous messageGo to next message
Jonathan Morton is currently offline  Jonathan Morton
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It may be that all you need is a terminator plugged directly into the
external SCSI port.

- Jonathan Morton

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Re: LVD-adapted drive and SCSI Voodoo question [message #283276 is a reply to message #283267] Sun, 01 February 2015 09:23 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
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Hi Scott,
I pulled 210MB SCSI (50-pin) drives from several Sun machines and none of them worked until I added termination.
I used inline resistor modules and plugged them into the sockets near to the 50-way connector.
I guess this wont be useful in your case but, as I don't know what your drive looks like, I can't help you further.


Jonathan, that's a great suggestion. Can anyone suggest a possible termination device that fits into the DA25 socket, please?
Cheers all,
Keith

On Sunday, 1 February 2015, 4:40, Jonathan Morton <chromatix99@gmail.com> wrote:


It may be that all you need is a terminator plugged directly into the external SCSI port. - Jonathan Morton
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Re: LVD-adapted drive and SCSI Voodoo question [message #283300 is a reply to message #283276] Sun, 01 February 2015 17:18 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
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Maybe like the one four rows down on the left on the page below?

< https://www.oddcables.com/store/productlist.asp?nav=scsi& ;department=26900>


I have similar one. It does fit on the external SCSI port of a IIsi and a PM 7500 although I never used it that way. It came with an external SCSI device with two 25 pin ports, can't remember which one. --Glen


________________________________
From: 'Keith Jamison' via Vintage Macs <vintage-macs@googlegroups.com>

Jonathan, that's a great suggestion. Can anyone suggest a possible termination device that fits into the DA25 socket, please?

Cheers all,

Keith


On Sunday, 1 February 2015, 4:40, Jonathan Morton <chromatix99@gmail.com> wrote:



It may be that all you need is a terminator plugged directly into the external SCSI port.
- Jonathan Morton


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Re: LVD-adapted drive and SCSI Voodoo question [message #283302 is a reply to message #283300] Sun, 01 February 2015 17:37 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
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Here's another one less expensive.< www.monoprice.com/Product?seq=1&format=2&p_id=814&am p;aid=cse&CA_6C15C=1565854416 >



----- Original Message -----
From: 'Glen' via Vintage Macs <vintage-macs@googlegroups.com>


Maybe like the one four rows down on the left on the page below?

< https://www.oddcables.com/store/productlist.asp?nav=scsi& ;department=26900>


I have similar one. It does fit on the external SCSI port of a IIsi and a PM 7500 although I never used it that way. It came with an external SCSI device with two 25 pin ports, can't remember which one. --Glen


________________________________
From: 'Keith Jamison' via Vintage Macs <vintage-macs@googlegroups.com>

Jonathan, that's a great suggestion. Can anyone suggest a possible termination device that fits into the DA25 socket, please?

Cheers all,

Keith


On Sunday, 1 February 2015, 4:40, Jonathan Morton <chromatix99@gmail.com> wrote:



It may be that all you need is a terminator plugged directly into the external SCSI port.
- Jonathan Morton

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Re[2]: LVD-adapted drive and SCSI Voodoo question [message #283311 is a reply to message #283276] Sun, 01 February 2015 23:46 Go to previous messageGo to next message
Scott Holder is currently offline  Scott Holder
Messages: 32
Registered: August 2012
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I guess the 25-pin terminator might be the path of least resistance, and
it's not like it'd make it hugely more clumsy. I'll look into that,
thanks.

The drive itself is an 18gb drive, model SR318404LC. Nothing especially
fancy about it, though the 10k RPM performance compared to the old 5400
rpm external 2gb drive I was using with it is very nice. I remember
seeing the resistor modules on plain 50-pin drives, but this drive
doesn't have anything like that. I'm not sure LVD drives normally would.
I've only dealt with a couple (the one this adapter used to be attached
to before it died) and it worked fine in a Beige G3 with no additional
work involved. I guess it could be worse, it's already a huge upgrade!

Scott



------ Original Message ------
From: "'Keith Jamison' via Vintage Macs" <vintage-macs@googlegroups.com>
To: "vintage-macs@googlegroups.com" <vintage-macs@googlegroups.com>
Sent: 2/1/2015 9:23:06 AM
Subject: Re: LVD-adapted drive and SCSI Voodoo question

> Hi Scott,
>
> I pulled 210MB SCSI (50-pin) drives from several Sun machines and none
> of them worked until I added termination.
>
> I used inline resistor modules and plugged them into the sockets near
> to the 50-way connector.
>
> I guess this wont be useful in your case but, as I don't know what your
> drive looks like, I can't help you further.
>
>
>
> Jonathan, that's a great suggestion. Can anyone suggest a possible
> termination device that fits into the DA25 socket, please?
>
> Cheers all,
>
> Keith
>
>
> On Sunday, 1 February 2015, 4:40, Jonathan Morton
> <chromatix99@gmail.com> wrote:
>
>
> It may be that all you need is a terminator plugged directly into the
> external SCSI port.
> - Jonathan Morton

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RE: Re[2]: LVD-adapted drive and SCSI Voodoo question [message #283316 is a reply to message #283311] Mon, 02 February 2015 08:53 Go to previous messageGo to next message
Wesley Furr is currently offline  Wesley Furr
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Registered: September 2012
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Just be careful of the heat being generated by that 10k drive. I worked for
a small computer place in the late 90's that custom built machines. We put
together a server with a pair of Cheetah drives (the 10k drives presumably
the same as you speak of) and then they kept failing. Turned out they
didn't have adequate cooling and were slowly roasting themselves to death.
Put them in drive bay adapters with fans and they were fine after that. I
mention this because I doubt the LC475 has much in the way of cooling for
the drive. If you're not sure, let it run for a half hour or so and ease
the cover off and touch the drive... Stock drives in those machines were
probably 5400rpm (or slower) drives that didn't generate much if any heat...

Another option might be to pick up an external enclosure with decent cooling
and run it that way...that would also probably get around your termination
issues... Thinking on it further, I think it would be accurate to say LVD
SE drives don't have termination capabilities...seems to me all those that I
saw (in the PC world) came with cables that had a terminator pack built onto
the end of them...

Wesley


_____

From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com]
On Behalf Of Scott Holder
Sent: Sunday, February 01, 2015 11:47 PM
To: vintage-macs@googlegroups.com
Subject: Re[2]: LVD-adapted drive and SCSI Voodoo question


I guess the 25-pin terminator might be the path of least resistance, and
it's not like it'd make it hugely more clumsy. I'll look into that, thanks.

The drive itself is an 18gb drive, model SR318404LC. Nothing especially
fancy about it, though the 10k RPM performance compared to the old 5400 rpm
external 2gb drive I was using with it is very nice. I remember seeing the
resistor modules on plain 50-pin drives, but this drive doesn't have
anything like that. I'm not sure LVD drives normally would. I've only dealt
with a couple (the one this adapter used to be attached to before it died)
and it worked fine in a Beige G3 with no additional work involved. I guess
it could be worse, it's already a huge upgrade!

Scott



------ Original Message ------
From: "'Keith Jamison' via Vintage Macs" <vintage-macs@googlegroups.com>
To: "vintage-macs@googlegroups.com" <vintage-macs@googlegroups.com>
Sent: 2/1/2015 9:23:06 AM
Subject: Re: LVD-adapted drive and SCSI Voodoo question


Hi Scott,


I pulled 210MB SCSI (50-pin) drives from several Sun machines and none of
them worked until I added termination.


I used inline resistor modules and plugged them into the sockets near to the
50-way connector.


I guess this wont be useful in your case but, as I don't know what your
drive looks like, I can't help you further.






Jonathan, that's a great suggestion. Can anyone suggest a possible
termination device that fits into the DA25 socket, please?


Cheers all,


Keith


On Sunday, 1 February 2015, 4:40, Jonathan Morton <chromatix99@gmail.com>
wrote:



It may be that all you need is a terminator plugged directly into the
external SCSI port.
- Jonathan Morton

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Re: LVD-adapted drive and SCSI Voodoo question [message #283324 is a reply to message #283266] Mon, 02 February 2015 12:29 Go to previous messageGo to next message
Jeff Walther is currently offline  Jeff Walther
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Registered: August 2012
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On Saturday, January 31, 2015 at 10:38:37 PM UTC-6, Scott Holder wrote:
>
> Hey folks,
>
> Recently picked up an 18gb LVD SCSI drive from a Sun machine for my LC475.
> Already had an adapter kicking around, so I now have it adapted to the
> classic 50-pin SCSI. The problem is it only works when I have something
> terminated plugged into the external SCSI.
>

Most likely, your adapter does not provide termination. SCA drives have no
on-board termination, so, in order to terminate your SCSI bus, you really
should have termination in the adapter. The $2 - $5 adapters on Ebay and
Amazon do not have termination. The least expensive SCA - 50 pin adapters
I've seen with termination are about $20, although OWC did have some for
~$10 for a while. I think they're out, unless they restocked.

Ideally, the upper 8 pins on the SCA drive should be terminated as well
(SCA drives are wide), not just the 50 pins in use.

Jeff Walther

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Re: LVD-adapted drive and SCSI Voodoo question [message #283325 is a reply to message #283324] Mon, 02 February 2015 12:42 Go to previous messageGo to next message
Derek Morton is currently offline  Derek Morton
Messages: 48
Registered: August 2012
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Member
Adding to Jeff's comments, I would say that you probably need to terminate the upper 8 bits. I had a real head scratcher a few years back trying to get SCA drives working in some of my older Quadras and the solution was a rather expensive SCA-50 pin adapter which provided upper byte termination. Even when forcing the drive into SE mode with the lower byte terminated, the drives (I tried more than 1 type) would simply not work without the upper byte being terminated.

Sadly, the seller I purchased most of my SCSI paraphernalia from has closed shop... And I could have used some more of the adapters too!

Derek

On Feb 2, 2015, at 11:29 AM, Jeff Walther wrote:

>
>
> On Saturday, January 31, 2015 at 10:38:37 PM UTC-6, Scott Holder wrote:
> Hey folks,
>
> Recently picked up an 18gb LVD SCSI drive from a Sun machine for my LC475. Already had an adapter kicking around, so I now have it adapted to the classic 50-pin SCSI. The problem is it only works when I have something terminated plugged into the external SCSI.
>
> Most likely, your adapter does not provide termination. SCA drives have no on-board termination, so, in order to terminate your SCSI bus, you really should have termination in the adapter. The $2 - $5 adapters on Ebay and Amazon do not have termination. The least expensive SCA - 50 pin adapters I've seen with termination are about $20, although OWC did have some for ~$10 for a while. I think they're out, unless they restocked.
>
> Ideally, the upper 8 pins on the SCA drive should be terminated as well (SCA drives are wide), not just the 50 pins in use.
>
> Jeff Walther

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Re: LVD-adapted drive and SCSI Voodoo question [message #283331 is a reply to message #283316] Mon, 02 February 2015 16:57 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
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Registered: April 2014
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Senior Member
On 2/2/2015 6:53 AM, Wesley Furr wrote:
> Just be careful of the heat being generated by that 10k drive. I worked
> for a small computer place in the late 90's that custom built machines.
> We put together a server with a pair of Cheetah drives (the 10k drives
> presumably the same as you speak of) and then they kept failing. Turned
> out they didn't have adequate cooling and were slowly roasting
> themselves to death.

Some 10K RPM SCSI drives didn't get so hot. Some years ago I put
together a box with a pair of 9 gig Ultra SCSI 10K Quantum drives. The
housings were gloss black with a few fins here and there. Absolutely
quiet and never got above warm to the touch.


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Re[4]: LVD-adapted drive and SCSI Voodoo question [message #283381 is a reply to message #283316] Tue, 03 February 2015 21:20 Go to previous messageGo to next message
Scott Holder is currently offline  Scott Holder
Messages: 32
Registered: August 2012
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Member
I was concerned about this myself, especially since I'm running a 33mhz
68040 in it. To my delight, it gets a bit warm to the touch but not too
terribly bad at all. In fact I feel like it gets hotter with the case
open and no airflow than closed with the fan running.

I have a couple external enclosures, but one of the goals of this
machine was a standalone machine with no bits hanging off it. A $5
25-pin active terminator is probably the easiest way to fix it that
doesn't involve expensive adapters. even if it doesn't quite keep it
fully slim.

Scott

------ Original Message ------
From: "Wesley Furr" <wesley@megley.com>
To: vintage-macs@googlegroups.com
Sent: 2/2/2015 8:53:40 AM
Subject: RE: Re[2]: LVD-adapted drive and SCSI Voodoo question

> Just be careful of the heat being generated by that 10k drive. I
> worked for a small computer place in the late 90's that custom built
> machines. We put together a server with a pair of Cheetah drives (the
> 10k drives presumably the same as you speak of) and then they kept
> failing. Turned out they didn't have adequate cooling and were slowly
> roasting themselves to death. Put them in drive bay adapters with fans
> and they were fine after that. I mention this because I doubt the
> LC475 has much in the way of cooling for the drive. If you're not
> sure, let it run for a half hour or so and ease the cover off and touch
> the drive... Stock drives in those machines were probably 5400rpm (or
> slower) drives that didn't generate much if any heat...
>
> Another option might be to pick up an external enclosure with decent
> cooling and run it that way...that would also probably get around your
> termination issues... Thinking on it further, I think it would be
> accurate to say LVD SE drives don't have termination
> capabilities...seems to me all those that I saw (in the PC world) came
> with cables that had a terminator pack built onto the end of them...
>
> Wesley
>

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RE: Re[4]: LVD-adapted drive and SCSI Voodoo question [message #283402 is a reply to message #283381] Wed, 04 February 2015 08:47 Go to previous message
Wesley Furr is currently offline  Wesley Furr
Messages: 79
Registered: September 2012
Karma: 0
Member
That is impressive...they have obviously done great things over the years as
far as reducing the heat generated off of enterprise-class drives. Thanks
for the info!

Wesley


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From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com]
On Behalf Of Scott Holder
Sent: Tuesday, February 03, 2015 9:20 PM
To: vintage-macs@googlegroups.com
Subject: Re[4]: LVD-adapted drive and SCSI Voodoo question


I was concerned about this myself, especially since I'm running a 33mhz
68040 in it. To my delight, it gets a bit warm to the touch but not too
terribly bad at all. In fact I feel like it gets hotter with the case open
and no airflow than closed with the fan running.

I have a couple external enclosures, but one of the goals of this machine
was a standalone machine with no bits hanging off it. A $5 25-pin active
terminator is probably the easiest way to fix it that doesn't involve
expensive adapters. even if it doesn't quite keep it fully slim.

Scott

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