In a message dated 2/7/03 10:19:42 AM, [EMAIL PROTECTED] writes: << ... The question is this: Why have I never terminated any device, nor did I own a terminator until a couple years ago? ... >>
Because the devices themselves act as a "weak" terminator. The SCSI-N spec calls for a 7438 open collector driver and a 7414 Schmitt-trigger receiver, and a 132 ohm transmission line, terminated at both ends in order to eliminate reflections. The 7414 (or the more modern equivalent, be it a 74LS14, or a 74LS244, or whatever) inherently provides a weak "pull up" resistor, which is precisely what the 220/330 terminator does. -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
