PDP11 Plessey disk drive info needed

From: Jgzabol_at_aol.com <(Jgzabol_at_aol.com)>
Date: Tue May 4 01:50:10 1999

In einer eMail vom 03.05.99 21:14:20, schreibt Tony:

<< >
> I would like to connect a Plessey disk drive to a PDP11 RK11-D controller.
>
> The drive has a fixed platter and a removable platter, compatible to RK05
I
> believe, and these numbers on it:
> Plessey 3468-0231
> PMDD/11B
> 700540-200217D
 
 I saw (and did minor repair on) one of these about 8 years ago. It wasn't
 mine, and I never saw a service manual :-(
 
>
> It has a 42 pin MRA 42 S mating connector, and same with a terminator. I
> believe the 42 pin should be a Drive Bus, to be connected with standard
> Unibus cable to controller slot 2A/2B.
 
 I seem to remember that the connector is similar (maybe identical) to the
 Diablo Model 30 connector, which I do have the pinout of. I can post that
 if it would help.
 
 One thing I certainly remember is that it used 1-of-n selects (like an
 RK02/Diablo model 30) and that it could only be linked directly to an
 RK11-C controller. There was a Plessey paddleboard that went into the
 drive connector slot on an RK11-D and had a decoder chip (at least, maybe
 some other simple logic) on it to sort this out.
 
 -tony
 
>>

I would certainly appreciate the Diablo pinout - if the pin layout is the
same, I would expect the signals to be the same , at least something easier
to check stan starting from nothing !

Thanks
John
Received on Tue May 04 1999 - 01:50:10 BST