Serial Port 1 Base Address; Parallel Port Base Address; Parallel Port Operation Mode - Acer Extensa 61X Service Manual

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
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
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.
3-8
3F8h(IRQ 4)
1
[378h(IRQ 7)] . The other options for this parameter are:
.
1
Service Guide