20 Oct
2005
20 Oct
'05
3:53 p.m.
Subject: Re: RL01 drive select plug and power supply questions
From: David Betz <dbetz at xlisper.mv.com>
Date: Thu, 20 Oct 2005 18:26:02 -0400
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
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
Unless you need the IO I'd pull it anyway. The system will run cooler
and I doubt you have need for the lines. DHV11 is a MUX and you need
the chassis kit to break out all the serial lines. Most OSs for PDP11
don't use it (system build time option) and the DLV11J is easier to use
and program. The DHV11 cannot be used for a console either.
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?
All the RQDXn controlers use the same cables. You will need the RQDX
breakout board (either out of the BA23 or M9058 out of the BA123) to take
the 50pin wide RQDXn to drive cables.
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.
The cables are nothing special. Your missing the intermediate board
that gors from the 50pin RQDXn to the 43pin that RX50 or RX33 uses
and the 34/26pin comblo that common MFM hard disks used.
Sounds like you have something like my 11/73. Mine is
4mb ram, RL02, RX33, (2)RD52 and RX02, serial is DLV11j.
I run unix V6, Rt11XM and XXDP.
Allison
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
>