RE: D9060 Hard drive

Termpower is pin 26,  in the middle of the cable...

In the board I was using, the was a jumper to set / remove to void sending the termpower through the cable...

I remember the terminator on SASI
But I don’t remember the termpower..
I'm not sure but I think this pin was connected to GND...

I confirm, in my documents, there is no termpower on sasi
Pins 20 to 30 are marked "for future use"

That's probably why on scsi adapter it was possible to remove the termpower.

I found  this document:  http://ia601603.us.archive.org/23/items/bitsavers_ansiX3T9SA_2034617/SASI_revC_Jan82.pdf 
about SASI (1982) about the period I was working on SASI/SCSI...

--
didier


-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de [mailto:owner-cbm-hackers@musoftware.de] De la part de Ted
Envoyé : mardi 2 avril 2013 18:16
À : cbm-hackers@musoftware.de
Cc : Ethan Dicks
Objet : Re: D9060 Hard drive

It didn't actually melt the copper wire, just the insulation.

On 4/2/2013 12:12 PM, Ethan Dicks wrote:
> On Tue, Apr 2, 2013 at 11:51 AM, Ted<ejohnson.ed@gmail.com>  wrote:
>> I got the bright idea of just bypassing the MFM to SCSI board and 
>> installing a SCSI drive directly to the DOS board. The cable started 
>> melting immediately. I have ordered a new cable and hope I did not 
>> fry the DOS board.
> You probably had both ends of the cable trying to provide TERMPWR.
>
> What part of the cable melted?  (what SCSI pins?)
>
> There are small differences between the packet commands for SASI and 
> SCSI-1.  There are plenty of differences between SASI and SCSI-2.
>
>> I did try plugging in a SCSI connector to connect the drive an 
>> Winchester2SCSI board. Windows 7  could not recognize it.
> That is entirely unsurprising.  Among other things that older bridge 
> cards do not support (even SCSI-1) is the IDENT packet that pretty  
> much all modern systems use to request the drive self-report its 
> geometry.  Back in the old days, you had to tell the OS how large the 
> disk was and it trusted you.
> Later, SCSI (and IDE) devices got smart enough that the OS could ask 
> the drive and not force the human to know the geometry.
>
> Even the modern Linux drivers require IDENT to be there.
>
> Old UNIX (4.1BSD for example) and non-mainstream OSes like AmigaDOS 
> let you/make you specify the drive geometry and could be used (if the 
> command packets sent from the OS driver are compatible with what the 
> drive supports) to raw-read the drive.
>
> Of course, there's one other wrinkle... the drive in the
> D9060/D9090 uses 256 byte sectors, *not* 512 byte sectors, which 
> commonly confounds modern OS drivers.
>
> -ethan
>
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