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Miami to Fort
Lauderdale Since 1994
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ACPI
July 1998.
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PnP/APM and ACPI |
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Adding
a new peripheral to the PC has come a long way
since the 486 and early Pentium days. Back then,
to add, say, a soundcard meant you have to
manually configure its settings via the card's
jumpers and DIP switches. These legacy devices (as
they are known now) made the PC very upgrade unfriendly
to end users .
To solve this problem, Intel and Microsoft
developed the Plug and Play (PnP) specification.
The introduction of PnP and the PCI slot was meant
to solve these upgrade problems. Like any emerging
PC technology, PnP went through a painful period
of maturity. PnP was jokingly called "Plug
and Pray" by many early users. This is
because peripheral manufacturers had to change
their products to meet the PnP specs. And BIOS
manufacturers such as AMI, Award, and Phoenix had
to do the same. Lastly, the operating system
itself had to be made PnP aware. If these three
components do not work together, then PnP as a
whole will not function correctly .
Microsoft's Windows 95 (released on August 25,
1995) was the first OS to support PnP. It took
awhile before the peripheral and BIOS makers
caught up, but they eventually did. But even
today, in some rare configuration, adding a PnP
card to your PC requires some troubleshooting.
Especially if you have multiple PnP devices in
your system already. But overall, PnP today really
works the way it's suppose to .
Besides PnP, a standard for power management
was also introduced. It was called APM (Advanced
Power Management). This was really aimed at the
rapidly growing notebook segment. But APM
eventually made its way to the desktop PC as well.
APM worked well to control simple things like
spinning down the HDD when it's not in use or
decreasing the processor speed when it's idle. But
APM didn't have the ability to manage power on
external devices, such as modem, printer, scanner,
etc. And with the introduction of USB,
many new devices will now be external .
Because of the various limitations of PnP/APM,
Microsoft, Intel, and Toshiba developed the next
generation specification for controlling and
managing devices. Advanced Configuration and Power
Interface (ACPI) combines both PnP and APM into a
single unified interface. ACPI provides an abstract
layer between software (typically the OS) and
hardware (add-on devices, internal or external).
Microsoft's Windows 98 is the first OS on the market
to support ACPI.
As with the original PnP, ACPI is now going
through some grow-up pains. BIOS on most PCs today
are not fully ACPI compliant yet. But when ACPI
reaches maturity, it will promise easy-to-configure
devices for end users, and greater control of power
management for peripheral makers .
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Creating MP3 Songs |
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| MP3
is MPEG layer 3 compression for audio. Click here
for a more detailed explanation of MP3.
So is it very difficult to convert CD music
tracks to MP3 files? Not at all. But remember that
MP3 encoding and decoding is very processor
intensive. Unless you have a great deal of patience,
I'd recommend a system with at least a Pentium
II/266 CPU. And you'd need a large hard drive, which
really isn't a problem since today's average HDD is
at least 2.5GB. For reference, it takes roughly 30
minutes for a Pentium II/333 to convert a 45MB WAV
(which is a four minute and 30 second song) file to
a 4.5MB MP3 file .
Once you have the proper hardware, you'll need to
get some software utilities to make the conversion
from CD audio track to MP3. You cannot convert an
audio track directly to MP3. You must first convert
the track to a WAV file. This is also known as
"ripping" a track. MP3 has a complete list
of CD rippers. I personally use WinDAC32, which is
shareware, but it has a nice easy-to-use interface.
Be aware that some older IDE CD-ROM drives
(especially those from Mitsumi) may not allow you to
rip music tracks .
Depending on the speed of your DVD/CD-ROM drive,
ripping a single track shouldn't take more than two
to three minutes. The resulting WAV file will take
up about 45-50MB for an average four minute song.
Once you have ripped all the tracks to WAV files,
it's now time to convert them to MP3. Again, MP3.COM
has a complete list of MP3 encoders you can
download. If you're creating a lot of MP3 files, be
sure to get an encoder that supports batch
processing mode. In other words, you just feed the
encoder a list of WAV files and it'll automatically
convert them all the MP3. This way, you don't have
to sit in front of your system all day long .
When encoding a WAV file to MP3, there's a couple
of options you can pick. The most important option
is the final bitrate of the MP3 file. This can vary
from 32K bits/sec to 320K bits/sec. Which bitrate
you should choose depends on how large the resulting
MP3 you want. Of course, selecting a lower bitrate
will affect the sound quality. I usually choose 128K
bits/sec, which will give me an MP3 file of about
4.5MB in size with close to CD sound quality. After
trying various GUI encoders, I now use Blade
Encoder, which is a small, freeware (78K) command
line DOS based encoder. It's simple and fast and it
works great in batch mode. Sometimes simplicity is
better...
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Intel 440GX AGPset & 450NX PCIset |
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Intel
will be officially launching its next generation
Pentium II processor this month. The Xeon
processor promise higher performance while
maintaining Pentium II compatibility. The Xeon CPU
will require a new slot 2 architecture. This means
Xeon system board will using new chipsets .
440GX AGPset - The only difference between
the 440GX and the current 440BX is the 440GX will be
able to address up to 2GB of memory (440BX can only
do 1GB). The 440GX will be able to support both the
slot 1 and slot 2 architecture. Since the 440GX will
only support up to two Xeon processor, this AGPset
is intended for highend workstations and mid-range
servers. All the features of the 440BX (100MHz FSB
support, USB, UltraDMA/33, AGP 2x, etc) will be
present on the 440GX. Click here
to view the 440GX specs on Intel's website .
- 440NX PCIset - Notice the 450NX is
classified as a PCIset instead of an AGPset.
This is because the 450NX does not support the
AGP slot. Intel intentionally left out AGP
support because the 450NX is meant for an
enterprise server system board. Another
interesting aspect of the 450NX is that it only
supports EDO memory. The 450NX can address up to
8GB of main memory. Intel recently annouced an errata
for the 450NX and their Xeon processor. Due to
this errata, four way Xeon CPU systems will be
delayed a couple of weeks. Intel will be
releasing a software fix for this problem.
Both the 440GX and 450NX represent Intel's
first generation Xeon/slot 2 chipset. As
expected, there's not too many new features in
these two chipsets. But the second and third
generation slot 2 chipsets will probably have
AGP Pro (AGP 4x), Firewire,
and RDRAM
(RAMBUS) support. Lastly, the front side bus
(FSB) between the processor and memory may be
increased to 133MHz.
Back to top...
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Copyright
© 1998 The Computer Guys |

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