31 Jan
2024
31 Jan
'24
6:34 p.m.
Anyone have a VMEbus system they use at least occasionally? If so, what
make/model/config?
I still use a couple of PPC VME boards (DY4 / Curtiss Wright 182/183/184, both
Conduction-Cooled and Air-Cooled) to test the tail end of hardware that we are
still shipping (by now EOL and basically NOS).
But it's work, I don't find them interesting.
If someone here has the warm fuzzies for PPC VME, we can talk :-)
W
31 Jan
31 Jan
6:56 p.m.
New subject: Vmebus
Ah, PPC VME cards, add VXworks, funky coprocessors, COTS IO and you have definitely got
something best avoided : details would involve libations.
The conduction cooled chassis are OK and worth repurposing. Contrariwise the VME bus is
best avoided, whether classic 32b VME or the 64 bit revision. However, the connectors for
VME 64x backplanes and the form factor have merit, but that is to depart from the past.
Martin
-----Original Message-----
From: Wouter de Waal via cctalk [mailto:cctalk@classiccmp.org]
Sent: 31 January 2024 18:34
To: cctalk(a)classiccmp.org
Cc: Wouter de Waal <wrm(a)dW.co.za>
Subject: [cctalk] Re: Vmebus
Anyone have a VMEbus system they use at least occasionally? If so, what
make/model/config?
I still use a couple of PPC VME boards (DY4 / Curtiss Wright 182/183/184, both
Conduction-Cooled and Air-Cooled) to test the tail end of hardware that we are still
shipping (by now EOL and basically NOS).
But it's work, I don't find them interesting.
If someone here has the warm fuzzies for PPC VME, we can talk :-)
W
7:12 p.m.
New subject: Qume 842 8" Disk Drive Question
I have recently acquired a Qume Model 842 double sided 8" disk drive.
I have reset all of the settings to factory default and hooked it up to
my greastweazle.
The drive works perfectly for double sided disks (using the appropriate
index hole).
However, the greaseweasel reports no index pulse when I put a single
sided diskette in the drive. I have attempted to clean out the sensor
for single sided diskettes to on avail.
Does any one have any ideas?
The grease weasel works perfectly when I connect SA-800 drives.
I have not yet tried installing terminating resistors in the Qume.
Thank you in advance for your help,
Mike
On 1/31/2024 12:56 PM, Martin Bishop via cctalk wrote:
Ah, PPC VME cards, add VXworks, funky coprocessors,
COTS IO and you have definitely got something best avoided : details would involve
libations.
The conduction cooled chassis are OK and worth repurposing. Contrariwise the VME bus is
best avoided, whether classic 32b VME or the 64 bit revision. However, the connectors for
VME 64x backplanes and the form factor have merit, but that is to depart from the past.
Martin
-----Original Message-----
From: Wouter de Waal via cctalk [mailto:cctalk@classiccmp.org]
Sent: 31 January 2024 18:34
To: cctalk(a)classiccmp.org
Cc: Wouter de Waal <wrm(a)dW.co.za>
Subject: [cctalk] Re: Vmebus
Anyone have a VMEbus system they use at least
occasionally? If so, what
make/model/config?
I still use a couple of PPC VME boards (DY4 / Curtiss Wright
182/183/184, both Conduction-Cooled and Air-Cooled) to test the tail end of hardware that
we are still shipping (by now EOL and basically NOS).
But it's work, I don't find them interesting.
If someone here has the warm fuzzies for PPC VME, we can talk :-)
W
8:17 p.m.
New subject: Qume 842 8" Disk Drive Question
On 1/31/24 11:12, Mike Katz via cctalk wrote:
I have not yet tried installing terminating
resistors...
That might help. It's also possible that the LED/phototransistor for
the SS index position is faulty. The two LEDs (SS and DS) are connected
in series, so you know that at least one isn't open. Grab your DMM and
check the voltage levels on pins A6 and A7 on connector J2. They should
change as the beam is broken in each with a piece of tinfoil or
something else opaque.
--Chuck
9:08 p.m.
New subject: Qume 842 8" Disk Drive Question
That is one of the tests recommended in the service manual. It's on my
list of things to check.
Thank you...
On 1/31/2024 2:17 PM, Chuck Guzis via cctalk wrote:
On 1/31/24 11:12, Mike Katz via cctalk wrote:
I have not yet tried installing terminating
resistors...
That might help. It's also possible that the LED/phototransistor
for
the SS index position is faulty. The two LEDs (SS and DS) are connected
in series, so you know that at least one isn't open. Grab your DMM and
check the voltage levels on pins A6 and A7 on connector J2. They should
change as the beam is broken in each with a piece of tinfoil or
something else opaque.
--Chuck
8:29 p.m.
New subject: Qume 842 8" Disk Drive Question
Connect an oscilloscope to the output of the single-sided sensor and see if
it works. If so, trace the signal through the logic and see if it gets to
the I/O connector that goes to the greaseweazel.
On Wed, Jan 31, 2024 at 2:38 PM Mike Katz via cctalk <cctalk(a)classiccmp.org>
wrote:
I have recently acquired a Qume Model 842 double sided
8" disk drive.
I have reset all of the settings to factory default and hooked it up to
my greastweazle.
The drive works perfectly for double sided disks (using the appropriate
index hole).
However, the greaseweasel reports no index pulse when I put a single
sided diskette in the drive. I have attempted to clean out the sensor
for single sided diskettes to on avail.
Does any one have any ideas?
The grease weasel works perfectly when I connect SA-800 drives.
I have not yet tried installing terminating resistors in the Qume.
Thank you in advance for your help,
Mike
On 1/31/2024 12:56 PM, Martin Bishop via cctalk wrote:
--
Michael Thompson
Ah, PPC VME cards, add VXworks, funky
coprocessors, COTS IO and you have
definitely got something best avoided : details would involve libations.
The conduction cooled chassis are OK and worth repurposing.
Contrariwise the VME bus is best avoided, whether classic 32b VME or the 64
bit revision. However, the connectors for VME 64x backplanes and the form
factor have merit, but that is to depart from the past.
Martin
-----Original Message-----
From: Wouter de Waal via cctalk [mailto:cctalk@classiccmp.org]
Sent: 31 January 2024 18:34
To: cctalk(a)classiccmp.org
Cc: Wouter de Waal <wrm(a)dW.co.za>
Subject: [cctalk] Re: Vmebus
182/183/184, both Conduction-Cooled and Air-Cooled) to test the tail end of
hardware that we are still shipping (by now EOL and basically NOS).
Anyone have a VMEbus system they use at least
occasionally? If so, what
make/model/config?
I still use a couple of PPC VME boards (DY4 / Curtiss Wright
But it's work, I don't find them interesting.
If someone here has the warm fuzzies for PPC VME, we can talk :-)
W
9:03 p.m.
New subject: Qume 842 8" Disk Drive Question
Michael,
Thank you, that was what I was planning as my next step. I haven't
checked to see if the service manual has a full schematic.
The main purpose of my message on here was to see if I was missing
something obvious like an option trace cut or something like that that I
missed when I checked the manual.
Thanks again,
Mike
On 1/31/2024 2:29 PM, Michael Thompson wrote:
> Connect an oscilloscope to the output of the single-sided sensor and
> see if it works. If so, trace the signal through the logic and see if
> it gets to the I/O connector that goes to the greaseweazel.
>
> On Wed, Jan 31, 2024 at 2:38 PM Mike Katz via cctalk
> <cctalk(a)classiccmp.org> wrote:
>
> I have recently acquired a Qume Model 842 double sided 8" disk drive.
>
> I have reset all of the settings to factory default and hooked it
> up to
> my greastweazle.
>
> The drive works perfectly for double sided disks (using the
> appropriate
> index hole).
>
> However, the greaseweasel reports no index pulse when I put a single
> sided diskette in the drive. I have attempted to clean out the
> sensor
> for single sided diskettes to on avail.
>
> Does any one have any ideas?
>
> The grease weasel works perfectly when I connect SA-800 drives.
>
> I have not yet tried installing terminating resistors in the Qume.
>
> Thank you in advance for your help,
>
> Mike
>
>
9:59 p.m.
New subject: Qume 842 8" Disk Drive Question
On 1/31/24 13:03, Mike Katz via cctalk wrote:
Michael,
Thank you, that was what I was planning as my next step. I haven't
checked to see if the service manual has a full schematic.
The main purpose of my message on here was to see if I was missing
something obvious like an option trace cut or something like that that I
missed when I checked the manual.
Thanks again,
Mike -
There is indeed a schematic in the 842 service manual PDF page 87 is
what you're looking for. Since the LEDs are always powered, you need
only be concerned with the output of the phototransistor. DMM is fine;
no scope necessary. An opto going bad is not completely unknown on
these drives. (I have a couple of the 842s--good drives, otherwise)
Diskette drives really are non-intelligent devices...
--Chuck
10:22 p.m.
New subject: Qume 842 8" Disk Drive Question
I haven't worked on 8" drives since the early 80's with th exception of
the RX02 drives on my PDP-8.
And DEC worked their own "magic" on those drives :)
Thanks for the help.
On 1/31/2024 3:59 PM, Chuck Guzis via cctalk wrote:
On 1/31/24 13:03, Mike Katz via cctalk wrote:
Michael,
Thank you, that was what I was planning as my next step. I haven't
checked to see if the service manual has a full schematic.
The main purpose of my message on here was to see if I was missing
something obvious like an option trace cut or something like that that I
missed when I checked the manual.
Thanks again,
Mike -
There is indeed a schematic in the 842 service manual PDF page 87 is
what you're looking for. Since the LEDs are always powered, you need
only be concerned with the output of the phototransistor. DMM is fine;
no scope necessary. An opto going bad is not completely unknown on
these drives. (I have a couple of the 842s--good drives, otherwise)
Diskette drives really are non-intelligent devices...
--Chuck
10:27 p.m.
New subject: Qume 842 8" Disk Drive Question
I believe the pull ups are all on inputs from the external controller
and not for outputs from the drive itself. Looking at the schematic the
Index output (J1-P20) does not go through the pull up resistors.
Thanks again for your help.
On 1/31/2024 3:59 PM, Chuck Guzis via cctalk wrote:
On 1/31/24 13:03, Mike Katz via cctalk wrote:
Michael,
Thank you, that was what I was planning as my next step. I haven't
checked to see if the service manual has a full schematic.
The main purpose of my message on here was to see if I was missing
something obvious like an option trace cut or something like that that I
missed when I checked the manual.
Thanks again,
Mike -
There is indeed a schematic in the 842 service manual PDF page 87 is
what you're looking for. Since the LEDs are always powered, you need
only be concerned with the output of the phototransistor. DMM is fine;
no scope necessary. An opto going bad is not completely unknown on
these drives. (I have a couple of the 842s--good drives, otherwise)
Diskette drives really are non-intelligent devices...
--Chuck
2 Feb
2 Feb
10:06 a.m.
New subject: Vmebus
On Wed, 31 Jan 2024 at 18:34, Wouter de Waal via cctalk
<cctalk(a)classiccmp.org> wrote:
Other than a reflexive twitch to see if NetBSD can run on the MPC7448? :-p
David
Anyone have a VMEbus system they use at least occasionally? If so, what
make/model/config?
I still use a couple of PPC VME boards (DY4 / Curtiss Wright 182/183/184, both
Conduction-Cooled and Air-Cooled) to test the tail end of hardware that we are
still shipping (by now EOL and basically NOS).
But it's work, I don't find them interesting.
If someone here has the warm fuzzies for PPC VME, we can talk :-) 
7 Feb
7 Feb
7:53 a.m.
New subject: Vmebus
On Feb 2, 2024, at 2:06 AM, David Brownlee via cctalk <cctalk(a)classiccmp.org>
wrote:
On Wed, 31 Jan 2024 at 18:34, Wouter de Waal via cctalk
<cctalk(a)classiccmp.org> wrote:
It’s NetBSD, of course it can run!
The real question is: Does it currently run? If the answer is “No,” it’s just a port away
as long as sufficient information about the CPU and platform is available.
The modularity in NetBSD that enables this is its greatest strength. It enables things
like the newly brought up “virt68k” platform which is basically NetBSD for a QEMU-hosted
68K emulator with VirtIO, which can be useful for things like kernel testing and pkgsrc
builds.
— Chris
If someone here has the warm fuzzies for PPC VME,
we can talk :-)
Other than a reflexive twitch to see if NetBSD can run on the MPC7448? :-p
288
days inactive
295
days old
11 comments
7 participants
participants (7)
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Chris Hanson -
Chuck Guzis -
David Brownlee -
Martin Bishop -
Michael Thompson -
Mike Katz -
Wouter de Waal