At 1:41 PM -0600 12/6/02, Blair Stilwell wrote:
>  >> He's thinking of upgrading its disk drive.  I've read that
>>>  it supports "wide SCSI", but I'm not sure if this means
>>>  single-ended, hvd or lvd (I'm guessing single-ended).  I'm
>>>  also wondering about the speed of the SCSI bus (20MHz?)
>>
>>  Almost certainly single-ended.  At a guess I'd say 10 MHz (20 MB/s if
>>  wide).  You may get better deals buying ATA disks, but I can't address
>>  the interface performance comparisons.
>
>The on board SCSI is narrow (10MB/s, 5MB/s external). Many of the 
>Beige G3s also have an UltraWide PCI (40MB/s) adapter that is a 
>53c875 card made by ATTO, installed at the factory.  If the computer 
>has a factory installed internal SCSI hard disk, most likely it has 
>this add-on card also factory installed.  I've also heard Apple 
>substituted an Adaptec 2940UW on some beige G3s.  The on board mesh 
>SCSI connects to the internal ZIP drive if it has one.  The internal 
>ATA is ATA-3, 16.6MB/s.

I have a few of these Apple SCSI boards made by ATTO.  I found that 
these boards need Apple's firmware update 
<http://docs.info.apple.com/article.html?artnum=25176> to run NetBSD. 
There's also a method for installing ATTO's firmware on the card, but 
that makes the name of the device in OpenFirmware longer, long enough 
to cause problems under OF 1.0.5 (I'm using the card on a PowerMac 
8500 since I couldn't get my OF 2.4 beige G3 to boot NetBSD).  By the 
way, with the updated Apple firmware on this card it also works well 
under NetBSD/i386.

-- 
Eric Damien Berna
eric@thiel.com