RL01 drive select plug and power supply questions

[David Betz]

Mine is a KDJ11-A processor, RL01, RX50, RX02, MXV11-AC boot, 1.5mb  
memory. I'm planning on running RT-11 and maybe Unix. I'd like to add  
an RDxx drive. It looks like I'll have to find a different bootstrap  
board to boot off of an RDxx though.

On Oct 20, 2005, at 6:53 PM, Allison wrote:

>>
>> 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
>>>
>>>
>
>