Ch 2: System Environment Setting
System Resources
Before discussing operations of the ICU, let us discuss system resources. Knowledge on system resources are indispensable to operating the ICU.
NOTE: All extended boards do not always require all of these four resources. The manual for each extended board should describe usable IRQ values, I/O addresses, DMA channels, and memory addresses.
In order for extended boards to operate on the system equipment, the following four resources are required:
•IRQ value (interrupt)
This signal is used by the devices for communicating with processors. Many of the extended boards allow choosing one IRQ value from among several IRQ values.
•I/O address
Serves as relay center for exchange of information between the processor and device. The processor can send commands and send/receive data via I/O ports.
•
•
DMA channel
Channel for data between I/O devices and memory, used for direct,
Memory address
Memory area reserved for specific extended boards.
If two extended boards use the same resource, one of the two might not operate at all or the system equipment might not operate as expected. The ICU can prevent duplicate allocation like this, allowing you to check allocation status.
Starting the ICU
Create the following backup disks for the ICU:
•
•
ISA Configuration Utility DISK1 (DISK1 below)
ISA Configuration Utility DISK2 (DISK2 below)
Cancel write protection for DISK2.
Starting the ICU
1.Insert DISK1 into Drive A, and turn on the system equipment. Succeeding to several messages, the following screen is displayed:
2. DOS prompt only.
Enter Choice:1
Choosing “1” h ere will display the following screen:
Please wait while ICU files are copied to RAMdrive.
Please insert the ICU Disk 2.
Strike a key when ready...
2.Replace the disk in Drive A with DISK2, and press any key (for example, In time the [ISA Configuration Utility] window is displayed.
Space
key).
Do not remove ICU DISK2 before the ICU terminates.
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