2 Dec
2021
2 Dec
'21
6:29 a.m.
Does anyone recognize the (presumably) DEC power supply on the front half of
the rack-bottom in the 11/44 listing at:
https://www.ebay.com/itm/363640137050
Blurry photo, but it looks like there are a 4x3, a 3x3, and a 3x5 Molex
connector, and two brown mini-modules protruding from the right side.
If so, then what purpose did it likely serve?
It appears that the 6U immediately below the 11/44 was likely occupied by an
RX02 given the presence of an M8256 in the 11/44 backplane (and skinny
mounting rails, although I thought those were usually at the bottom of the
RX02), and that included its own power supply (which wasn't very beefy
either, nor did it need to be).
What went into the 6U immediately above the power supply is unclear; there
is a HEX Wespercorp TC130 Tape Controller as well as three unknown QUAD
modules in the 11/44 backplane. Perhaps there was a horizontal autoload
tape drive mounted there that required a separate power supply?
Curious!
paul
2 Dec
2 Dec
8:37 a.m.
On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk <cctalk at classiccmp.org>
wrote:
Does anyone recognize the (presumably) DEC power
supply on the front half
of
the rack-bottom in the 11/44 listing at:
https://www.ebay.com/itm/363640137050
Blurry photo, but it looks like there are a 4x3, a 3x3, and a 3x5 Molex
connector, and two brown mini-modules protruding from the right side.
If so, then what purpose did it likely serve?
It's not a DEC power supply, it's a Fujitsu power supply, likely for an
M2284 SMD drive. Probably went in the empty slot you mention below.
- Josh
It appears that the 6U immediately below the 11/44 was likely occupied by
an
RX02 given the presence of an M8256 in the 11/44 backplane (and skinny
mounting rails, although I thought those were usually at the bottom of the
RX02), and that included its own power supply (which wasn't very beefy
either, nor did it need to be).
What went into the 6U immediately above the power supply is unclear; there
is a HEX Wespercorp TC130 Tape Controller as well as three unknown QUAD
modules in the 11/44 backplane. Perhaps there was a horizontal autoload
tape drive mounted there that required a separate power supply?
Curious!
paul
3 Dec
3 Dec
3:36 a.m.
Those red cables appear to be SDI - maybe that spot was an RA80/RA81?
The boards appear to be correct for a UDA50 (M7485/M7486, but it's hard
to make out the board numbers).
??? -Rick
On 12/2/2021 11:37 AM, Josh Dersch via cctalk wrote:
On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk
<cctalk at classiccmp.org>
wrote:
Does anyone recognize the (presumably) DEC power
supply on the front half
of
the rack-bottom in the 11/44 listing at:
https://www.ebay.com/itm/363640137050
Blurry photo, but it looks like there are a 4x3, a 3x3, and a 3x5 Molex
connector, and two brown mini-modules protruding from the right side.
If so, then what purpose did it likely serve?
It's not a DEC power supply, it's a Fujitsu power supply, likely for an
M2284 SMD drive. Probably went in the empty slot you mention below.
- Josh
>
>
> It appears that the 6U immediately below the 11/44 was likely occupied by
> an
> RX02 given the presence of an M8256 in the 11/44 backplane (and skinny
> mounting rails, although I thought those were usually at the bottom of the
> RX02), and that included its own power supply (which wasn't very beefy
> either, nor did it need to be).
>
>
>
> What went into the 6U immediately above the power supply is unclear; there
> is a HEX Wespercorp TC130 Tape Controller as well as three unknown QUAD
> modules in the 11/44 backplane. Perhaps there was a horizontal autoload
> tape drive mounted there that required a separate power supply?
>
>
>
> Curious!
>
> paul
>
> 
6:30 a.m.
On 02/12/2021 16:37, Josh Dersch via cctalk wrote:
On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk
<cctalk at classiccmp.org>
wrote:
> Does anyone recognize the (presumably) DEC power supply on the front half
> of the rack-bottom in the 11/44 listing at:
It's not a DEC power supply, it's a Fujitsu
power supply, likely for an
M2284 SMD drive. Probably went in the empty slot you mention below.
Yep. Looks identical to the Fujitsu PSU in my 11/40 rack, and the rails
are the same as my Fujitsu rails.
--
Pete
Pete Turnbull
5 Dec
5 Dec
10:45 p.m.
Josh & Pete: Thank you for the identification. Don't think that the unidentified
quad-boards constitute a SMD controller. I guess the SMD controller was in the second
chassis and went wherever the HDD went. Strange that the PS didn't go with it. I can
feel a bit better for not having recognized the PS :-}.
Rick: The UDA50 is cabled up the rear of the rack to a connector-plate near the top of
the rear-rails. No photo of the plate present, but the cabling is clear on the side-photo
of the rack. So presumably there was a second rack in the original configuration ...
probably also housing a vertical-mount 9" tape drive.
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Pete Turnbull via
cctalk
Sent: Friday, December 3, 2021 9:30 AM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Unrecognized DEC Power Supply in PDP-11/44 Configuration
On 02/12/2021 16:37, Josh Dersch via cctalk wrote:
On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk
<cctalk at classiccmp.org>
wrote:
> Does anyone recognize the (presumably) DEC power supply on the front
> half of the rack-bottom in the 11/44 listing at:
It's not a DEC power supply, it's a Fujitsu
power supply, likely for
an
M2284 SMD drive. Probably went in the empty slot you mention below.
Yep. Looks identical to the Fujitsu PSU in my 11/40 rack, and the rails are the same as
my Fujitsu rails.
--
Pete
Pete Turnbull
895
days inactive
899
days old
4 comments
4 participants
participants (4)
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derschjo＠gmail.com -
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