Byron is right on target. And no. You don't want to learn about reflections of pulses at the ends of organ pipes. Some other things:
The disk probably has little, 10 or so pin, resistor chips that are the SCSI terminator. They can be physically removed from their sockets in the disk itself if it is not to be used at the end of a chain. The sockets can become loose or dirty. If you pull one of them take note of the dot at one end so you know how to put them back. The Mac has a terminator built in and should always be at one end of a SCSI chain. Terminators need power to operate properly. One of the 50 wires is tied to +5 volts somewhere and a surprising amount of current is required so computers with marginal power sources like early Macs often don't provide this "terminator power" but rely on the external equipment to provide it. Any hardware that provides terminator power will have a 1 amp fuse in the line. They are often little green things soldered to the PC board. They fail. The 5 volt line is one of the center pins in the ribbon cable and you can check for 5 volts to ground with a meter. Shorting the pin to ground WILL blow the fuse. There is also the SCSI ID of the drive. I think there is no internal disk in your machine but if there is it will be #0 and the external one cannot also be #0. The computer is #7. Newer disks, and 40 MB is probably not one of them, have a single jumper that can be installed to enable or disable the soldered-in terminating resistors. It's often labelled TE. The disk manufacturer's web sites are very good at providing information for the various jumpers, even for old disks. -- --> There are 10 kinds of people: those who understand binary, and those who don't <-- -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.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/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
