PDP11 Plessey disk drive info needed - test-drb@ccmp.vtda.org

3 May 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