[Coco] Frustrated in Seattle

[Mike Pepe]

Is there a terminator on the 5.25 drive as well? If so, remove it. The
terminator should live as close to the physical end of the cable as
possible, but in reality I have had success using 2x 3.5 drives on one
cable despite their relatively high impedance pull-ups.

You are correct in that if using the 3.5 as /d1 the cable does not need
to be modified. Most PC drives are hardwired to respond to DS1 thus the
need for ribbon cable twisting.



> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Ed Orbea
> Sent: Wednesday, March 12, 2008 9:25 PM
> To: Coco Group @ Maltedmedia.com
> Subject: [Coco] Frustrated in Seattle
> 
> In response to questions raised by Mike Pepe in Redmond
> 
> I'm using new cables created by Mark at Cloud-9
> The cable I am trying first, has a 5.25 connector at the end and a 3.5
> connector in the middle. No pins are missing or swapped.
> I am testing with the 5.25" as /d0 (using /dd40 and /d040) and the
3.25
> as /d1 (using /d180)
> The 3.25 drive has a terminating resistor pak installed.
> It is my understanding that DS0 and DS1 are selected by the controller
> and not the "wire swapping" like is done on MS-DOS. When I use my 5.25
> configurations, the cables are "straight thru" and the actual drives
> are
> jumpered as DS0 and DS1, so I assumed that the same configuration
would
> work on the 3.25 drives.
> 
> Ed
> 
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