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From: ron@motmpl.UUCP (Ron Widell)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: 720k floppy drive
Keywords: terminating resistor
Message-ID: <1527@motmpl.UUCP>
Date: 16 Feb 90 05:44:31 GMT
References: <22899@usc.edu>
Reply-To: ron@motmpl.UUCP (Ron Widell)
Followup-To: comp.sys.ibm.pc
Organization: Motorola Semiconductor, Minneapolis, MN.
Lines: 27

In article <22899@usc.edu> kjh@pollux.usc.edu (Kenneth J. Hendrickson) writes:
>I have just gotten a 720k drive.  On all my 5.25" drives, there is a
>terminating resistor that can be plugged in or removed to select drive
                                                           ^^^^^^
That's not the purpose at all. The clue is in the designation *terminating*
resistor, i.e. line terminating resistor. We're talking transmission line
theory here, folks. The resistor pack should be placed *ONLY* in the last
physically connected drive (the end of the line :-)).
>A: or drive B:.  I can't find any such resistor on my 720k drive.  Is
It's probably not there, but there's probably a socket for it, although it
may require a different package type (SIP) than the one in your 5 1/4" drive
(probably a DIP).
>there any jumpers I must set on my 720k drive to select the B: drive?
All PC's (and most clones) that I've seen leave the drive-select jumpers
configured for drive 0 (when numbered 0-3, otherwise 1 for 1-4). The actual
drive selection then occurs by those funny little twisted parts of the cable
going to the drive.
This should have been covered in the docs that came with your drive.

Follow-ups have been re-directed to comp.sys.ibm.pc

Regards,
-- 
Ron Widell, Field Applications Eng.	|UUCP: {...}mcdchg!motmpl!ron
Motorola Semiconductor Products, Inc.,	|Voice:(612)941-6800
9600 W. 76th St., Suite G		| I'm from Silicon Tundra,
Eden Prairie, Mn. 55344 -3718		| what could I know?