Path: utzoo!attcan!uunet!nih-csl!lhc!adm!smoke!gwyn
From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.sys.apple2
Subject: Re: APPLE HIGH SPEED SCSI Vs Ramfast
Message-ID: <14247@smoke.brl.mil>
Date: 26 Oct 90 05:20:45 GMT
References: <0093EB2AE6574820.00000111@dcs.simpact.com>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 13

In article <0093EB2AE6574820.00000111@dcs.simpact.com> scottr@gnh-applesauce.cts.com (Scott Rothstein) writes:
>The need for terminators is questionable.

It is not at all questionable, since improper termination yields horrible
noise margins.  Apple's High-Speed (DMA) SCSI Card is internally terminated,
unlike the previous non-DMA Apple SCSI Card.  However, both ends of the
SCSI bus need termination.  Therefore, one more terminator is called for at
the "far" end of the bus.

Most SCSI devices are shipped with terminating resistor packs installed.
These are removable and in fact should be removed, unless you wish to use
internal termination at the far end of the SCSI bus in place of the more
convenient but more costly use of an external terminator.