Hitachi 8880R Manual Do Utilizador

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, high-speed data transfer.

•

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.

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.

Insert DISK1 into Drive A, and turn on the system equipment.

Succeeding to several messages, the following screen is displayed:

Choosing “1” here will display the following screen:

Replace the disk in Drive A with DISK2, and press any key (for example, 

 key).

In time the [ISA Configuration Utility] window is displayed.

ROM-DOS Startup Menu
1. Start up ICU.
2. DOS prompt only.

Enter Choice:1

Please wait while ICU files are copied to RAMdrive.

Please insert the ICU Disk 2.
Strike a key when ready...

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