>> 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.

 >> Does his beige G3 support 5V cards, 3.3V or both? As
 >> you can tell, I'm not all that familiar with this model.

They support PCI 2.1 with both 3.3V and 5V power, 5V signaling.


Blair Stilwell