willa@hp-vcd.HP.COM (Will Allen) (01/19/91)
When and where should I use SCSI terminators? Currently, I have a IIfx and an Apple CD ROM. It seems to work fine now (I know, don't fix it if it's not broken), but enquiring minds want to know. . . .Will Will Allen HP Vancouver Division willa@vcd.hp.com or ...!hplabs!vcd!willa or Will ALLEN / HP5400/UX
costello@stx.UUCP (Michael E. Costello) (01/23/91)
In article <1991Jan22.222417.27735@convex.com>, woods@convex.com (Darrin Woods) writes: > > In article <1170009@hp-vcd.HP.COM> willa@hp-vcd.HP.COM (Will Allen) writes: > >When and where should I use SCSI terminators? Currently, I have a IIfx and an > >Apple CD ROM. It seems to work fine now (I know, don't fix it if it's not > >broken), but enquiring minds want to know. > > > You summed it up perfectly, and it also answers your question. > If it works, don't futz with it. If it doesn't work you can use Apple's > formula - Termination on the first device on the chain (usually internal > hadr drive) and the last device. Or you can use my scientific method. Put > a terminator in the loop and move it from device to device until it works. > > And if it allready works, leave it alone, it doesn't need one. > > Blacksheep > > -- > Senior Systems Engineer woods@convex.com > > Convex is not my employer-Therefore they are not responsible for what I say. > > Following is a document put out by Micronet Technologies that comes close to being the definitive work on SCSI devices and termination. (This file must be converted with BinHex 4.0) :$(0MFfPTEQC[,R0TG!"6593K8dP8)3#3""VG!*!%mb06593K!!%!!"VGFNaKG3% !N!J#$&0$8dNJC'9dB@PXFd0655j35dI4'%#"d5M!`!!$!*!*+VAQ!#IFm!!V(j) $NJ%1!#3!!3#3!bUf!&4&@&4(48p-!!#MCF&'SfA"4J#3"M8r!*!''PF!!0EX!*! 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9FSGCd!K+-KJK*)8dGaT'RYL0$@ENCFNj`#K+B,f`MRpM`G(*1cPZq+'j%4-Sb*P !N`CM[H,Ck90C`B44V*(5eG&USGe#A-Q$T(@)V%FY(1!EZerb`rhabH$$(pGKPr3 9N3j@6BiLB84'4)aU9NK4BX#a@*NN!TXKifi+*JhF&N6A2)`6ibJ1R#L8HB33XG- 5ie,bAMV)2%)&V'!q@-*XF&X*3L53!)5+L*a@3Pb"#3-&4Q'&'[4bcJp38$qI%#P %S&'i,8e%LJJ)eDaH*S'I84+8!Sr$#MP!"Yb!3&%[K4d6Z!SSB'$5J%f"!fE!$@J "0J!'1)PkD35#!"C!Q!U6B6V-&U!9E!!0!!ZqX3(dQaEj6NTJ9XJ"AQ%cF!40k#l 6MbGN2k'3!#Ni"C!!f3!!M'3!!!: ==>Michael Costello costello@world.std.com ==>BCS*Mac, The Boston Computer Society Macintosh User Group ==>P.O. Box 2591; Woburn, MA 01888 617-631-8188
woods@convex.com (Darrin Woods) (01/23/91)
In article <1170009@hp-vcd.HP.COM> willa@hp-vcd.HP.COM (Will Allen) writes: >When and where should I use SCSI terminators? Currently, I have a IIfx and an >Apple CD ROM. It seems to work fine now (I know, don't fix it if it's not >broken), but enquiring minds want to know. > You summed it up perfectly, and it also answers your question. If it works, don't futz with it. If it doesn't work you can use Apple's formula - Termination on the first device on the chain (usually internal hadr drive) and the last device. Or you can use my scientific method. Put a terminator in the loop and move it from device to device until it works. And if it allready works, leave it alone, it doesn't need one. Blacksheep -- Senior Systems Engineer woods@convex.com Convex is not my employer-Therefore they are not responsible for what I say.
minsky@media-lab.MEDIA.MIT.EDU (Marvin Minsky) (01/23/91)
In article <1991Jan22.222417.27735@convex.com> woods@convex.com (Darrin Woods) writes: >In article <1170009@hp-vcd.HP.COM> willa@hp-vcd.HP.COM (Will Allen) writes: >>When and where should I use SCSI terminators? Currently, I have a IIfx and an >>Apple CD ROM. It seems to work fine now (I know, don't fix it if it's not >>broken), but enquiring minds want to know. >> >You summed it up perfectly, and it also answers your question. >If it works, don't futz with it. Well, how do you know if it works? I have three disks out there on that chain from my IIfx. They *seem* to work. Except that when I use GOFER (DA), which searches disks rather fast, it screws up on one of those disks. Worked OK on the MacII. Could it be due to marginal terminator performance?
woods@convex.com (Darrin Woods) (01/23/91)
> >Well, how do you know if it works? I have three disks out there on >that chain from my IIfx. They *seem* to work. Except that when I use >GOFER (DA), which searches disks rather fast, it screws up on one of >those disks. Worked OK on the MacII. Could it be due to marginal >terminator performance? Not to bad mouth the fx, I have one myself, but before I blamed the SCSI chain, I would blame GoFer. In my experiences with the fx, if there is a problem on the SCSI bus, the fx just flat won't even boot. This can be correlated back to the earlier macs as well, they bomb or give a quickly blinking bomb box on boot up if there is a problem in the SCSI chain. Maybe someone else out there with an fx has had similar problems and can share them and their solution. Blacksheep -- Senior Systems Engineer woods@convex.com Convex is not my employer-Therefore they are not responsible for what I say.