Acer 420 manual System Devices, Parameter Description Options, Dma, DMA1/ DMA3

System Devices

The System Devices screen contains parameters involving your hardware devices. It also provides advanced settings of the system.

The table below describes the parameters in the screen. Settings in boldface are the default and suggested parameter settings.

Parameter	Description	Options
Internal TouchPad	Determines whether or not to disable the internal	Both or Auto
	touchpad of a PS/2 pointing device is connected.
Infrared Port (FIR)	Sets the interrupt request of the serial port. Please	Disabled/ Enabled/ Auto
	set the parameter to “Enabled” if you need to use
	FIR under Windows operation system.
Base I/O address/IRQ	Sets the I/O address of the Infrared port.	3F8h/IRQ4; 2F8h/IRQ3; 2E8h/IRQ3
DMA	Sets a DMA channel for the printer to operate in	DMA1/ DMA3
	disabled mode.
Parallel Port	Enables, disables or auto detects the parallel port.	Enabled/Disabled/Auto
Mode	Sets the operation mode of the parallel port.	ECP, EPP, Normal or Bi-directional
Base I/O address/	Sets the I/O address of the parallel port. This	378h, 278h or 3BCh
	parameter is enabled only if Mode is set to ECP or
	Bi-directional.
Interrupt	Sets the interrupt request of the parallel port.	IRQ 7 or IRQ5
DMA Channel	Sets a DMA channel for the printer to operate in	DMA3 or DMA1
	ECP mode. This parameter is enabled only if Mode
	is set to ECP.

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