20 Oct
2005
20 Oct
'05
3:19 p.m.
Subject: RL01 drive select plug and power supply questions
From: David Betz <dbetz at xlisper.mv.com>
Date: Thu, 20 Oct 2005 17:28:56 -0400
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Does anyone have a spare RL01 drive select plug for drive "0"? I
recently acquired an RL01 drive (thanks Lyle Bickly and Jon Miles!)
but it's missing its drive select plug. This is one of the four
lights on the front of the drive that has the number "0" printed on
it for drive 0. Does anyone have one they're willing to part with?
Also, the PDP-11/73 that I acquired is in a BA11-NC box. Does anyone
know how much power the power supply in this box can supply? There is
a list of the cards in the box and the power each one consumes and
I've inserted an additional card (an RQDX1 controller) that draws
6.4A at 5V and I'm not sure that the power supply can handle it. That
would bring the total to 26.9A at 5V where the original total was
22.3A. I could remove a DHV11 card that draws 4.3A to bring the total
down to 22.6A if necessary. What is save with this power supply?
Thanks,
David
BA-11N +5 at 22A +12 at 11A max assumes H9273 mackplane and H786 PS
I have a system that I subbed in a H7861 to the BA11N that PS is same size
and form factor but +5 at 36A and +12 at 5A (typically found in BA11S). As most
newer boards had a greater need for +5 than +12.
If you don't need the serial lines then pull the DHV11. I've found
running the supply right at the limit was not the best for reliability.
Also the RQDX1 was not a very good version unless it was upgraded to
RQDX2. the reason is it didn't support RX33, and the largest disk
if memory serves for RQDX1 was RD52 (30mb quantum D540). RQDX2 supported
the RD53(70mb) and RD54 (150mb). The RQDX3 supported more drives and
is a bit lighter in current draw (RD31 and 32 plus RX33).
ALSO the RQDX1 MUST BE LAST ON THE BUS. Many of the RQDX1 controllers
lacked GRANT pass down.
Allison
20 Oct
20 Oct
3:26 p.m.
Thanks for your reply. I guess I'm okay with power even if I leave in
the DHV11 as it seems my BA11-N has been upgraded to a H7861 power
supply already. I'll consider getting an RQDX3 instead of the RQDX1.
Do you know if it uses the same cables to connect it with its drives?
Actually, the only cable I have is to connect the RQDX1 to an RX50
floppy drive. I'll need a cable to connect it to a hard drive at some
point. It seems that the RQDX3 cards are easier to come by than the
cables. I've seen many cards on eBay but never any cables.
On Oct 20, 2005, at 6:19 PM, Allison wrote:
Subject: RL01 drive select plug and power supply questions
From: David Betz <dbetz at xlisper.mv.com>
Date: Thu, 20 Oct 2005 17:28:56 -0400
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Does anyone have a spare RL01 drive select plug for drive "0"? I
recently acquired an RL01 drive (thanks Lyle Bickly and Jon Miles!)
but it's missing its drive select plug. This is one of the four
lights on the front of the drive that has the number "0" printed on
it for drive 0. Does anyone have one they're willing to part with?
Also, the PDP-11/73 that I acquired is in a BA11-NC box. Does anyone
know how much power the power supply in this box can supply? There is
a list of the cards in the box and the power each one consumes and
I've inserted an additional card (an RQDX1 controller) that draws
6.4A at 5V and I'm not sure that the power supply can handle it. That
would bring the total to 26.9A at 5V where the original total was
22.3A. I could remove a DHV11 card that draws 4.3A to bring the total
down to 22.6A if necessary. What is save with this power supply?
Thanks,
David
BA-11N +5 at 22A +12 at 11A max assumes H9273 mackplane and H786 PS
I have a system that I subbed in a H7861 to the BA11N that PS is
same size
and form factor but +5 at 36A and +12 at 5A (typically found in BA11S).
As most
newer boards had a greater need for +5 than +12.
If you don't need the serial lines then pull the DHV11. I've found
running the supply right at the limit was not the best for
reliability.
Also the RQDX1 was not a very good version unless it was upgraded to
RQDX2. the reason is it didn't support RX33, and the largest disk
if memory serves for RQDX1 was RD52 (30mb quantum D540). RQDX2
supported
the RD53(70mb) and RD54 (150mb). The RQDX3 supported more drives and
is a bit lighter in current draw (RD31 and 32 plus RX33).
ALSO the RQDX1 MUST BE LAST ON THE BUS. Many of the RQDX1 controllers
lacked GRANT pass down.
Allison
7004
days inactive
7004
days old
1 comments
2 participants
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