RE: Unrecognized DEC Power Supply in PDP-11/44 Configuration
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 On Behalf Of Pete Turnbull via cctalk Sent: Friday, December 3, 2021 9:30 AM To: General Discussion: On-Topic and Off-Topic Posts 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 > > 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
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 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
Re: Unrecognized DEC Power Supply in PDP-11/44 Configuration
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 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
Re: Unrecognized DEC Power Supply in PDP-11/44 Configuration
On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk 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 > >
Unrecognized DEC Power Supply in PDP-11/44 Configuration
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
