6-2
MIDI, SCSI, and Sample Dumps
SCSI Guidelines
engineering department has encountered have been due to bad cables that didn’t twist
pairs of wires properly. Correctly made SCSI cables have one ground wire for every signal
wire and twist them together in signal/ground pairs. Cables made by APS Technologies
(http://www.apstech.com, 1-800-395-5871) are very good and are highly recommended.
Young Chang manufactures 1 and 2 meter 25-25 SCSI cables, that we can also recommend.
Good cables are essential to reliable data transfers to and from the disk drive.
5. You should buy all SCSI cables from a single source to avoid impedance mismatch
between cables.
6. Theoretically all eight SCSI IDs can be used. However, feedback from users has shown us
that many people have problems with more than five or six devices in a chain. If you have
seven or eight devices and are having problems, your best bet is to make sure you have
followed all of the previous information, especially with respect to cables.
7. Connect all SCSI cables before turning on the power on any equipment connected by SCSI
cables. Plugging or unplugging SCSI cables while devices are powered on can cause
damage to your devices or instrument.
8. When using a Macintosh, power up the K2661 and other devices first.
9. The K2661 file format is a proprietary format; no other device will be able to read or write
a Kurzweil file.
10. The K2661 can read from and write to the first partition on a DOS-formatted disk.
11. As long as the SCSI bus is properly terminated there is no way you can damage your
hardware simply by operating it. There are a few hazards you should be aware of,
however:
The only damage that usually occurs to SCSI hardware comes from static electricity
discharging to SCSI connector pins when the cables are disconnected. The silver colored
shell of the SCSI connector on the end of the cable is connected to ground and is safe to
touch, but the brass colored pins inside eventually lead to the SCSI interface chip and are
vulnerable. You should discharge static from your body before touching SCSI connectors,
by touching the 1/4-inch jacks on the rear of the K2661 or another grounded metal object.
Any devices connected to the SCSI bus should be turned off when plugging or
unplugging SCSI cables.
If the K2661 is connected to a Macintosh or PC you should make sure that the computer
cannot access a SCSI disk at the same time the K2661 does (see below for more
information on this). If you occasionally want to share a drive, but don’t want to take any
risks, you should connect and disconnect devices as needed. If you want to share drives
often and cannot constantly disconnect and reconnect devices, make sure the Mac or PC is
really done with the disk before using the K2661. Furthermore, you should quit or exit
from all running programs and disable screen savers, email, network file sharing, and any
INITs or TSRs that run in the background. If the computer and K2661 access the disk at the
same time there will be no damage to the hardware, but the bits on the disk, K2661, and
computer memory can easily be corrupted. You may not know that damage has been done
to these bits until unexpected things start to happen for no apparent reason.
12. A good way to verify your SCSI hookup is to save and load some noncritical files.
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