PDP11 Plessey disk drive info needed

From: Jgzabol_at_aol.com <(Jgzabol_at_aol.com)>
Date: Wed May 5 03:16:10 1999

In einer eMail vom 04.05.99 21:47:46, schreibt 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 !
 
 OK, here you are. The pin layout on the connector is something like :
 
     A B
 C D
     E F
 H J
     K L
 M N
     P R
 S T
     U V
 W X
     Y Z
 AA BB
     CC DD
 EE FF
     HH JJ
 KK LL
     MM NN
 PP RR
     SS TT
 UU VV
     WW XX
 
 For a total of 42 pins (I am not sure if that's looking at a plug or a
 socket, but it should be a start).
 
 A Read Clock
 B Write data and clock
 C Read data
 D Ground
 E Read gate
 F Ready to read/write/seek
 H Write protect input
 J Track select 8's
 K Erase gate
 L Drive select 1
 M High density
 N Track select 2's
 P Write protect status
 R Drive select 2
 S Pseudo sector mark
 T Track select 64's
 U Drive ready
 V Drive select 3
 W Sector marks
 X Track select 16's
 Y Index marks
 Z Drive select 4
 AA Head select
 BB Track address 128's
 CC Sector address 1's
 DD ground
 EE Write gate
 FF Track select 32's
 HH Write check
 JJ Sector address 2's
 KK Sector address 4's
 LL Track select 1's
 MM Sector address 8's
 NN Address acknowledge
 PP +5v for cable terminator
 RR Track select 4's
 SS Strobe
 TT Seek incomplete
 UU Sector address 16's
 VV Restore
 WW ground
 XX Illegal address
 
 If you need descriptions of any of those, let me know - I have the full
 service manual for the Diablo.
 
>
> Thanks
> John
>
 
 -tony
 
>>

That is EXACTLY what I need - the connector has the letters above imprinted,
and the meaning of the signals I have from the DEC docs. This is precisely the
RK-11 Drive Bus.

Thank you _VERY_ much!

Regards
John G. Zabolitzky
Received on Wed May 05 1999 - 03:16:10 BST