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3-8 Service Guide
3.4.5 Serial Port 1 Base Address
The serial port can accommodate a modem, serial mouse, serial printer, or other serial devices.
The default setting for the serial port base address is 3F8h(IRQ 4)
1
.
Other options include:
• 2F8h(IRQ 3)
• 3E8h(IRQ 4)
• 2E8h(IRQ 3)
• Disabled
Make sure the serial port base address does not conflict with the address used by a PCMCIA card,
if one is installed.
3.4.6 Parallel Port Base Address
The parallel port can accommodate a parallel printer or other parallel devices. The default setting
for the parallel port base address is [378h(IRQ 7)]
1
. The other options for this parameter are:
• 278h(IRQ 5)
• 3BCh(IRQ 7)
• Disabled
3.4.7 Parallel Port Operation Mode
The parallel port supports four operation modes:
• Standard and Bidirectional
• Extended Capabilities Port(ECP)
• Standard and Unidirectional
• Enhanced Parallel Port(EPP)
ECP or Extended Capabilities Port supports a 16-byte FIFO (first in, first out) which can be
accessed by host DMA cycles and PIO cycles. ECP boosts I/O bandwidth to meet the demands
of high-performance peripherals. EPP or Enhanced Parallel Port is a parallel port interface that
greatly improves performance for bi-directional block-mode data transfers. EPP provides greater
throughput by supporting faster transfer times and a mechanism that allows the host to address
peripheral device registers directly.
1
The parameter value is the base address expressed in hexadecimal.