Disk drive parts

[Director]

That little terminator card sounds right. IIRC the drives daisy chain
together. The cable from the Four-Phase end would be proprietary. They
tended to use an edge connector for I/O - often 44 pins. The daisy chain
cables are those V.35 looking connectors - what we used to call a
Winchester. I probably have some of those. I guess they were pretty standard
in the disk world. I may have the PS. Can't imagine why I would have pitched
that. Can't recall if it was a Diablo unit as well, but it seems like it
was.

Gil

A. G. (Gil) Carrick, Director
The Museum at CSE
University of Texas at Arlington
Department of Computer Science & Engineering
Box 19015, 471 S Cooper Street
Arlington, TX 76019
817-272-3620
http://www.cse.uta.edu/TheMuseum@CSE/

> -----Original Message-----
> From: cctech-bounces at classiccmp.org 
> [mailto:cctech-bounces at classiccmp.org] On Behalf Of Tony Duell
> Sent: Thursday, August 04, 2005 6:27 PM
> To: cctalk at classiccmp.org
> Subject: Re: Disk drive parts
> 
> >  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. 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.
> 
> > 
> >    Joe
> > 
> > >
> > >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.
> 
> -tony
> 
>