User`s guide

2-16 Installing the PCC-10 Card
System Resources
Each PCC-10 card requires four contiguous bytes of I/O address space starting on a
modulo-4 based address (i.e., an address evenly divisible by 4). A dedicated
interrupt request (IRQ) is also required for each PCC-10 card used.
Windows 95
I/O resource problems are rare under Windows 95 for the PCC-10 card since the
card can handle a wide range of I/O settings. However, IRQ resource problems
may occur more often in “multimedia” computers which may have very few spare
IRQs. The Windows 95 operating system handles most allocations of IRQs, but
there are some instances where the operating system cannot properly allocate
interrupt requests.
When the Windows 95 Device Manager does not locate a free IRQ for a newly
inserted PCC-10 card, it will not assign the card an IRQ. As a result, there may be
no indication to the user that a problem has occurred, since no true resource
“conflict” has occurred. This is a consequence of the PCC-10 card’s ability to be
assigned any of the system’s 16 IRQs.
IRQ usage in the system can be determined by opening the System icon in the
Control Panels window. The tab labeled “Device Manager” allows viewing of
devices by type or connection.
The PCC-10 L
ON
W
ORKS
Network Interface device icon is found under the
“LonWorks Interface” device type, or under the “
PCIC
or compatible
PCMCIA
controller” connection. If there is a problem with the PCC-10 card, there will be a
red circle with an exclamation point next to its icon.
The
PCMCIA
socket device type may contain a “
PCIC
or compatible
PCMCIA
controller” device that has a different IRQ than the “PCC-10 L
ON
W
ORKS
Network
Interface” device. This occurs because the
PCMCIA
controller has its own IRQ for
detecting card insertions and removals.
IRQ resource problems may generally be resolved by disabling another device in
the system. More information can be found in the Hardware Conflict
troubleshooting portion of the Windows 95 on-line help file.
Access the hardware conflict troubleshooter through the procedure outlined below:
1. Open the Windows 95 on-line help by clicking the Windows Start button and
selecting “Help”.
2. In the Help Topics window, choose the Contents tab, or from another Help
window, choose the Contents button.
3. Double click the Troubleshooting topic, and then select the help topic, “If you
have a hardware conflict,” or “If you have trouble using a PC card
(
PCMCIA
).”
Extensive trouble-shooting documentation can be found in the Microsoft Windows
95 Resource Kit Help File. This help file is part of the Windows 95 Resource Kit,
which is available from Microsoft.