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AHA-2740W/2742W/2744W
Connecting Floppy Drives (AHA-2742W and AHA-2744W
Only)
Floppy disk drives are connected to the host adapter by a 34-pin
floppy ribbon cable with a 34-pin header connector. Up to two
floppy diskette drives can be connected to the host adapter.
When connecting your floppy drives, make sure to maintain pin-1
orientation as previously described in Cabling the Host Adapter on
page 5.
Note:
If you are not using the floppy controller on the
AHA-2742W and AHA-2744W, be sure to disable it by
removing the jumper connector on jumper J1.
The AHA-2742W and AHA-2744W support only floppy pri-
mary address 3F0h - 3F7h. The IRQ channel is hard-wired
for channel 6 and the DMA channel is hard-wired for
channel 2.
Terminating the SCSI Bus
To reduce signal reflections on the SCSI bus, the first and last physi-
cal SCSI devices on the ends of the SCSI bus must have a set of resis-
tors called terminators either installed or enabled. All other SCSI
devices installed between the ends of the SCSI bus must have their
terminators either removed or disabled. The host adapter must also
be properly terminated. If it is in the middle of the SCSI bus, it must
have its termination disabled (e.g., when there are both internal and
external SCSI devices). See Configuring Host Adapter Termination on
page 9 for a description of the termination configuration settings.
Note:
The last device on the SCSI bus must have its termina-
tion installed or enabled. Many differential SCSI devices
currently produced have no provisions for terminators;
therefore, they need some external means of I/O line termi-
nation.
Refer to the manufacturer's documentation to determine how to
enable or disable termination on your SCSI device(s).
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