[Coco] SCSISYS question

[Bob Devries]

Gene,
does the term power usually come from the host adaptor, or from one of the 
drives?
If it is the latter, could the problem be solved by simply having all 50 
wires present between the two drives?

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Gene Heskett" <gene.heskett at verizon.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, June 24, 2006 1:36 PM
Subject: Re: [Coco] SCSISYS question


> Bob Devries wrote:
>> Does anyone here use SCSISYS 2.2 with two SCSI drives?
>> I have been trying to add a second drive as a backup unit to my system, 
>> but having no luck at all. The system just locks up when I try to access 
>> it using SCSIFMT. Even if I build a descriptor using SCSIDESC, I cannot 
>> access the drive.
>>
>> Gene, do you have any ideas on this?
>> dmode /h0 gives:
>> drv=00 stp=00 typ=84 dns=80 cyl=0385 sid=05
>> vfy=00 sct=0035 tos=0035 ilv=05 sas=08
>>
>> dmode /h1 gives:
>> drv=01 stp=00 typ=84 dns=81 cyl=0385 sid=05
>> vfy=00 sct=0035 tos=0035 ilv=05 sas=08
>
> In the dns=81, what does the 1 do?  I've forgotten.
>
>> Both drives are Quantum Prodrive LPS-120S. One drive has no jumpers, and 
>> the other has a jumper on A0. The terminator resistor is removed from the 
>> first drive on the cable (H1).
>>
>> Have I overlooked something? H0 works very well, and is giving 11 secs/MB 
>> with megaread on NitrOS9 V030206.
>> H1 lights up its LED, but then the computer locks up. I can (usually) 
>> switch windows, but can't type commands.
>
> That essentially duplicates the experience I had, Bob.  My drives were not 
> alike, but I wasn't able to do a 2 drive setup at all using scsisys2.2 and 
> a disto 4n1.  Any attempted access to the second drive resulted in a 
> locked up system.  Like you, I recall I could switch windows, but that was 
> about it.  My second drive was also a quantum 820 megger, first was a 
> maxtor 7210s (130 MB)
>
> I was told at the time, but don't recall who said it, that the 34 wire 
> scsi implementation of the disto 4n1 resulted in some signals required for 
> multi-drive access weren't there.  The disto used a 34 wire floppy cable, 
> split down the middle so it picked up the outside 17 wires on each end of 
> a std 50 pin scsi connector. Among the missing signals was term power on 
> pin 26, so it was required to have the drive supply its own term power. 
> That might be a clue, but off hand if the terms are removed from the 2nd 
> drive, there might still be a need for term power in order to power the 
> cable interface chips on that 2nd drive.  Is that jumper set on the 2nd 
> drive?
>
> I can't think of anything else atm cause I didn't ever make it work 
> either, sorry.
>
> I was able to use the quantum on my big box amiga for a few months, but it 
> eventually silently self destructed.  I didn't use it a lot, and I'd put 
> some stuff on it to get it out of the way on the main drive at the time, a 
> 1GB seagate Hawk.  I have 2 of those, both seem to be indestructable as 
> one of them is now on my coco3.
>
> -- 
> Cheers, Gene
>
>
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