More precisely, a CD-ROM _or_ a tape drive. There's only one drive bay
available for the removable media drive.
No, both ... the floppy can be deleted altogether, or it can be moved
down towards the speaker, using the 9150 front plastic and floppy bracket.
Hell, I've even installed a SCSI Zip
Derek Morton [EMAIL PROTECTED] wrote:
A SCSI conflict will (should) only happen if both devices exist on the
same physical bus. Since the 900 / 950 has two physical busses, there
should be no conflict, but the internal bus devices take precedence
over the external bus devices (until 4.3
It seems that 'hardware-wise', it's OK to have both buses fully
populated with devices, but most of standard software will go crazy
looking at it! :-)
The machine was designed to accommodate five internal HDs, and at least
in the WGS 95 incarnation it will accommodate a CD-ROM and a tape as
Date: Thu, 2 Oct 2003 20:49:09 -0500
From: Derek Morton [EMAIL PROTECTED]
I really cannot imagine needing more than seven SCSI devices...
CD-ROM, M.O., Printer, Scanner... This still leaves three for hard
drives (and I doubt many people are running SCSI printers). What else
is there? Perhaps
From: [EMAIL PROTECTED]
Message-ID: [EMAIL PROTECTED]
Date: Wed, 1 Oct 2003 23:51:49 EDT
Subject: Re: SCSI Manager 4.3 and the Q900/950?
The idea of the internal bus taking precedence over the external bus
comes from Apple documentation. I have never bothered to have
identical SCSI IDs on devices
Date: Wed, 1 Oct 2003 21:22:52 -0500
From: Derek Morton [EMAIL PROTECTED]
I am looking at
making a memory card which allows the system to run full bore at zero
wait states (RAM and ROM). Think of it as a cache card on steroids.
There are a couple of problems, one of which is that the memory is
AMP has about 300 in stock, but their minimum order
is 1008 at $9 each and all the distributers are out of stock.
Call the AMP rep and ask for an engineering sample.
Don't go overboard. One or two will usually be provided with no problem.
More usually raises suspicion.
I usually ask for two
Determining the needed speed of the SRAM does not really work in that
fashion... although it is a common mistake people make. What you need
to keep in mind is that to run at zero wait states the memory must get
the data on the bus within the (zero wait state) timing requirements of
the CPU.
In a message dated 10/03/03 16:44:18, [EMAIL PROTECTED] writes:
I really cannot imagine needing more than seven SCSI devices...
CD-ROM, M.O., Printer, Scanner... This still leaves three for hard
drives (and I doubt many people are running SCSI printers). What else
is there? Perhaps I
Jeff Walther [EMAIL PROTECTED] wrote:
I did a search on my computer on SCSI Manager and found some
information I didn't know I had. According to Inside Macintosh,
volume Devices, section SCSI_Manager_4.3.pdf,
-snip-
Thanks for the information, Jeff!
WBR,
Artur
--
Quadlist is sponsored
A SCSI conflict will (should) only happen if both devices exist on the
same physical bus. Since the 900 / 950 has two physical busses, there
should be no conflict, but the internal bus devices take precedence
over the external bus devices (until 4.3 loads). I mentioned in an
earlier email
[EMAIL PROTECTED] wrote:
But I have another question: where that SCSI Manager 4.3 extension can
be found?
Included in MacOS 7.6.1 or later.
It might be able to be extracted from the 7.6.1 installer files.
Hmm, I'm asking because I'm using MacOS v7.6.1 on Quadra-950 right now,
and I
Hmm, I'm asking because I'm using MacOS v7.6.1 on Quadra-950 right now,
and I don't see any extensions related to the SCSI management. Also, I'm
unable to find them in the installation tomes... Do you know exact
filename/location?
SCSI manager 4.3 is integrated in the system in 7.6.1, it's not a
The idea of the internal bus taking precedence over the external bus
comes from Apple documentation. I have never bothered to have
identical SCSI IDs on devices residing on both the built-in busses.
Seven devices has always been sufficient for my needs... Especially
since I use a JackHammer
The idea of the internal bus taking precedence over the external bus
comes from Apple documentation. I have never bothered to have
identical SCSI IDs on devices residing on both the built-in busses.
I have tested CD-ROMS on the internal and the external buses, both drives
being ID=3, and both
Jeff,
As I mentioned, the order of bus scanning is important to note. If you
have devices with the same ID on both the internal bus and the external
bus, the device on the internal bus takes precedence. Thus you only
have access to 7 devices until 4.3 loads... Or so the theory (and
Date: Tue, 30 Sep 2003 06:29:04 -0500
From: Derek Morton [EMAIL PROTECTED]
As I mentioned, the order of bus scanning is important to note. If you
have devices with the same ID on both the internal bus and the external
bus, the device on the internal bus takes precedence.
Okay. I wasn't sure
Jeff Walther [EMAIL PROTECTED] wrote:
So, if one has SCSI Manager 4.3 loaded (it's an extension as well as
built into ROM in later machines) does the Quadra 900 support a full
14 SCSI devices on its two SCSI busses (7 each). Or is it still
limited to seven total?
Hi Jeff,
AFAIK, the MacOS
In a message dated 9/29/03 8:05:20 AM, [EMAIL PROTECTED] writes:
AFAIK, the MacOS doesn't support separate SCSI buses, so it uses both of
them as single 'virtual bus', with no duplicate ID allowed.
MacOS supports two SCSI buses (as on the Q950) mapped into a single, virtual
SCSI bus with the
In a message dated 9/29/03 8:27:27 AM, PeterH5322 writes:
But I have another question: where that SCSI Manager 4.3 extension can
be found?
Included in MacOS 7.6.1 or later.
It might be able to be extracted from the 7.6.1 installer files.
Don't know if it could be installed on an earlier
Date: Mon, 29 Sep 2003 17:25:19 +0300
From: Artur Yelchishchev [EMAIL PROTECTED]
But I have another question: where that SCSI Manager 4.3 extension can
be found?
I did a search on my computer on SCSI Manager and found some
information I didn't know I had. According to Inside Macintosh,
volume
Date: Sun, 28 Sep 2003 21:05:55 -0500
From: Derek Morton [EMAIL PROTECTED]
When SCSI manager 4.3 is active you should indeed have access to 14
total devices. Unfortunately since SCSI manager 4.3 is not active
until after the system loads, you really don't have access to all the
devices at boot
The Quadra 900 and 950 each have two hardware SCSI busses. I.e.,
they each have two NCR 53C96 chips connected to electrically separate
SCSI bus hardware. However, the Apple hardware developer document
Mac_Quadra_900.pdf states that The internal and external SCSI
buses are logically
In a message dated 9/27/03 11:13:01 PM, [EMAIL PROTECTED] writes:
So, if one has SCSI Manager 4.3 loaded (it's an extension as well as
built into ROM in later machines) does the Quadra 900 support a full
14 SCSI devices on its two SCSI busses (7 each). Or is it still
limited to seven total?
From: [EMAIL PROTECTED]
Date: Sun, 28 Sep 2003 02:19:26 EDT
In a message dated 9/27/03 11:13:01 PM, [EMAIL PROTECTED] writes:
So, if one has SCSI Manager 4.3 loaded (it's an extension as well as
built into ROM in later machines) does the Quadra 900 support a full
14 SCSI devices on its two SCSI
Jeff,
When SCSI manager 4.3 is active you should indeed have access to 14
total devices. Unfortunately since SCSI manager 4.3 is not active
until after the system loads, you really don't have access to all the
devices at boot time. Even with the workgroup server card which gives
you two
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