NEC READY ES PRO Service And Reference Manual page 5

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CMOS memory. The chip also contains the system's real-time clock. Both are maintained by a 3-volt coin cell

lithium battery on the system board. The battery is replaceable.

DMA/IRQ

Settings

The system automatically configures interrupt requests (IRQ), direct memory access (DMA) channels, and

other parameters when adding PCI boards with minimal user intervention.

Table 1-3 and Table 1-4 list system IRQ and DMA default settings.

IRQ

NMI

* Default, but can be changed.

IDE Ports

Table 1-3 Interrupt Level Assignments

Reserved, cascade interrupt form slave PIC

LPT2 (Plug and Play option)/Audio/User available

Windows Sound System*/User available

Onboard mouse port (if present, else user available)

Primary IDE (if present, else user available)

Secondary IDE (if present, else user available)

Table 1-4 DMA Assignments

DMA

System Resource

I/O channel check

Reserved, internal timer

Reserved, keyboard buffer full

COM2*

COM1*

Diskette drive

LPT1*

Real-time clock

User available

User available/USB

Reserved, math coprocessor

Audio/Parallel port

Diskette drive

ECP parallel port/Audio

Reserved, cascade channel

Resource

Audio

Available