Disk drive parts

[Joe R.]

At 12:27 AM 8/5/05 +0100, you wrote:
>>  The RK05 uses a DEC backplane
>> >block internally, with genuine Unibus cables (RK11D) or a DEC-style
>> >paddle connector and 40-pin ribbon cables (RKV11D, RK8E). 
>> >_Electrically_ the Diablo 30 should be the same as a real RK05, but
>> >mechanically, the cables are entirely different.
>> 
>>    Yeah that was an unplesant surprise!   
>
>Althoguh if you get a real Diablo cable, it has the connector mounted on 
>a little PCB, with a trasnistion connector and then a length of ribbon 
>cable on that. If you take off one end, the wires are in almost the right 
>ordser to solder to a DEC 'unibus' cable board to link to the RK11-C or 
>whatever. I wonder why :-)
>
>> 
>>    BTW I found out that the d30 uses an external power supply. Does anyone
>> have the specs or pinout for it or even an extra PSU?
>
>I thought the manuals were on bitsavers. The PSU pinout should be in 
>there.

   Yes, the manuals are on Bit-savers but IIRC they don't recall them
giving any details about the PSU.

 There were 2 PSUs from Diablo, one using a transsitorised 
>regulator, the other using a ferroresonant trasnformer. DEC also made 
>their own PSU (H734 or something) for these drives.

   Can you check and make sure that that's the correct PN? If it is, I'll
go hunt for one. There are piles of DEC PSUs in Melbourne.



>> 
>> >
>> >The drive chain also needs to be terminated.  In the case of an RK05,
>> >it's an M930 Unibus terminator in the last drive.  Not sure about a
>> >Diablo 30, unless you hang a real M930 off of one of those cable
>
>The Diablo terminator is a PCB stuffed with resistors soldered to the 
>connector. There's a +5V pin on the connector to power the terminator, of 
>course. I have _one_ of them, I also have 2 drives and the 
>interconnecting cables, so it's not up for grabs.

   Do you have schematics for any of those?

   Joe

>
>-tony
>
>