At 02:00 AM 8/29/98 -0700, Todd Whitesel wrote:
>> This 3rd disk is ultra wide (20mhz 16-bit xfers)
>> 
>> Now, I put the 3rd disk at the end of the wide scsi cable coming out
>> of the adaptec and the boot up messages say that its using 10mhz xfers :(
>> 
>> So can you not mix fast and ultra devices on a single cable without
>> falling down to the slowest device?
>
>Can you put the wide disk on a cable by itself and boot an installation
>floppy to see what xfer speed it gets?

Good idea, I will try this.

>I have a couple ultra-wide drives myself, and they always seem to come up at
>10 mhz. I have non-ultra devices on the same bus now, but I vaguely recall
>booting without them long ago and still getting 10 mhz transfers.
>
>Looking at /usr/src/sys/dev/ic/aic7xxx.c, I see that 10 mhz is the highest
>"non ultra" transfer frequency. So maybe something is globally disabling
>ultra features in the driver?
>
>Todd Whitesel
>toddpw @ best.com

Think it would be possible to force the driver to talk 20mhz to a 
ceartain device?

Thanks,
Nick