kjh@pollux.usc.edu (Kenneth J. Hendrickson) (02/15/90)
This is the wrong group to ask a hardware question in, but I expect to find someone here with the answer. 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 A: or drive B:. I can't find any such resistor on my 720k drive. Is there any jumpers I must set on my 720k drive to select the B: drive? Kenneth J. Hendrickson N8DGN kjh@usc.edu ...!uunet!usc!pollux!kjh
ron@motmpl.UUCP (Ron Widell) (02/16/90)
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?
mlau@hpspcoi.HP.COM (Mel Lau) (02/17/90)
If your hooking up your 3.5 disk to be drive B, try using drivers.sys in the config.sys to make it drive b. Mel
kaldis@traffic.rutgers.edu (Theodore A. Kaldis) (02/18/90)
In article <1527@motmpl.UUCP> ron@motmpl.UUCP (Ron Widell) writes: > Kenneth J. Hendrickson: >> I have just gotten a 720k drive. [...] terminating resistor [...] >> I can't find any such resistor on my 720k drive. > It's probably not there, but there's probably a socket for it, I have installed several 720K drives, and none of them had a terminating resistor. Your drive may not need one either (or there may be a jumper for it). >> Is 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). This is incorrect. The drive should be set as drive *1* if the choice is from 0 to 3, and drive *2* if it is from 1 to 4. If you set BOTH drives as Mr. Widell suggests above, the system will still work, but the drive before the twist in the cable will be drive A:, and the drive after the twist will be drive B:. -- Theodore A. Kaldis | "Perhaps we may +-+-+-+-+-+-+-+-+- | frighten away email: kaldis@topaz.rutgers.edu | the ghost of so UUCP: {...}!rutgers!topaz.rutgers.edu!kaldis | many years ago U.S. Snail: P.O. Box #1212, Woodbridge, NJ 07095 | with a little ex-Ma Bell: (201) 283-4855 (voice) | illumination . . ."