Doing your own PC upgrade provides personal
satisfaction
(Computer Upgrading pt 2)
by Alan Zisman (c) 1991, originally
published in INPUT, July 1991
In the May-June 1991 issue, I talked about upgrading
your old PC compatible
computer. At that time, we looked at whether you need to upgrade at
all,
and if so, should you buy a new machine, or upgrade your older machine.
In this issue, we're going to assume that you've decided to upgrade
your
motherboard (and maybe some or all of your peripherals).
Even with new clone prices dropping rapidly, the cost
of replacing just
your motherboard is falling just as fast. I'm looking at a price list
from
Vancouver's Universal Technology (not a plug... lots of other stores
have
similar prices) today (early July, 1991). They're listing clone
286/386SX/386DX
prices as $828/1028/1228 (1meg memory, 40 meg hd, mono card). If you
buy
just a motherboard, the prices listed are $108/298/498. (That's with 0k
memory, so add $68 for a meg memory). So you can potentially turn your
old XT clone into a 12 mhz 286 for under $200. What are you waiting
for?
(I'll get to the catch(es) soon).
Replacing a motherboard feels like doing brain
surgery, but it needn't
be as scary. (I'm going to assume you have a fairly standard XT-clone
in
a large case... if you have an odd-ball machine, or one with only a few
slots because your graphics card & disk controllers are built into
your motherboard, you've got more problems, and may want to just break
down and buy a new machine).
Decide what you want to buy... how much you can
afford. Buy more memory
than you think you need. At under $70 a meg, it's very cheap, and
you'll
want more sooner than you think. Check whether your existing keyboard
will
run on an AT/386. Buy your new board and memory, and remember to get
the
documentation!
Set aside a couple of hours where you won't be
disturbed. Park your
hard drive and turn off your computer. Open the case (normally removing
the 5-6 screws on the back). Ground your self and your tools by
touching
the power supply (the silver box at the back right corner with the
warning
sticker). Look around. You should see 4-8 expansion slots towards the
back
cards in some of them. Unplug any wires from the cards (making note of
which way they go... do the stripes on the ribbon connectors to your
drives
face the back or the front?). Remove your expansion cards by gently
rocking
them back and forth. Make note of which slot each card is in...
sometimes
that will make a difference.
Unplug the lead connecting your motherboard to the
power supply. Depending
on the size of your motherboard and case, you may not need to remove
the
disk drives. If you do, unplug the power leads and ribbon connectors,
and
unscrew the screws on the side of the drives. They'll slide right out
to
the front.
Most motherboards are connected to the case with 1-2
screws and several
plastic spacers. Take out the screws, and gently move the motherboard
so
that it will lift right off the plastic spacers. Your new board should
have the screw holes in the same place, and MAY fit right over the
plastic
spacers. If not, they're easily moved. Before you slide the new board
into
place, take a look at it, and the documentation (you DID get
documentation,
didn't you?) Check where to plug any wires (reset button, turbo switch,
etc.). Do you need to set jumpers for mono/colour or to tell the
computer
whether you've got 256 or 1 meg memory chips? Do it now while it's
convenient.
Now you can put the new board into your case,
replace the screws,
and carefully put everything else back the way it was. You should not
have
to force anything (too much !)
You're almost ready to turn it on. But let's check two
other things
first. Is your power supply rated at 150 watts or more? If not, it'll
probably
work, but you may want to replace it soon ($50-100). Will your keyboard
work with an AT/386? XT and AT keyboards may look the same... and some
work with both machines, and some have a little switch on the bottom,
but
some, especially older models won't work. Did you think to take it with
you to the store and try it out? (A new AT keyboard can costs as little
as $50).
Boot up with a floppy disk. AT's (and above) have
setup information
stored in battery-powered CMOS memory, that you'll need to set. As your
computer is checking the memory, there may be a message about the setup
(my AMI bios says "Press delete to alter setup"... other bios(es) will
require other keys... if there's no message, read your documentation).
You'll need to get to the setup screen.
Here, you set the date and time, and tell the computer
about your floppy
drives and hard drives. If you have bought an AT (16 bit) controller
card
for your hard drive, you need to find out the drive number (it may be
marked
on the drive) or know the number of heads and cylinders on your hard
drive.
If you're still using your old, 8-bit XT hard drive controller, your
life
is easier. Tell the setup program that you have no hard drive... an XT
hard drive controller stores its own configuration.
When you've answered all the questions, your machine
will reboot. Check
to make sure the machine recognizes all your drives. You're in
business.
But I said earlier that there was a catch. You've just
spent $150-250
for a 12 mhz 286 with 1 meg, $350-450 for a 386SX, or more (a 486
motherboard
is listed at $1600)... and your computer is running faster, but on some
applications, you may hardly notice it. You've still got your old, slow
XT harddrive and controller, and your old CGA or monochrome video. Some
software makes extensive use of harddrive reads, or video redraws and
here
your old peripherals are dragging the rest of the system down.
Be prepared to live with this for a while, but once
you've got the upgrade
bug, you probably won't want to stop now. You've done the hardest part.
Here are some current prices for other things you might want to upgrade
soon:
AT IO card (serial/parallel port): $28 (cheap enough to go
for
right away)
IDE hard drive--40 meg: $248+38 for controller
80 meg: $400+38 for controller
VGA video cards: $70-300
VGA monochrome monitor: $150-250
VGA colour monitor: $300-sky's the limit
Upgrading your motherboard is more of an adventure
than walking into
a store and plunking your cash (or plastic) on the counter for a new
computer.
Doing it the hard way will give you satisfaction of knowing that
you did it yourself. You'll learn more about computer hardware, and be
more prepared if something goes wrong further down the line. And you'll
end up with a custom machine that meets your needs and desires, and
that
you'll be better able to change as you (inevitably) demand more from
your
computer. Let me know how it works out.