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IDE connections, 40
pin or 44?
The standard connector for desktop computers is 40
pins. For laptops, they shrunk the connector but added
four more pins, so they could eliminate the power cord.
The first 40 pins are identical on both types. The uA1-C
has one of each. If you are planning on using a 2.5"
drive, it will
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plug right into the 44 pin header. If you're
only using larger "desktop"
drives, use the 40 pin header. If you want more
than two bigger drives, you will need an adapter.
All of the adapters I've seen so far are for plugging
a laptop drive into a desktop machine.
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I wanted to plug a regular IDE cable into the
mini connector on the board. The adapters are
passive connectors, so they can be used either
way. Just unplug the power connector on them and
plug them into the 44 pin header on the micro
board.
I chose a small, molded connector from the same
vendor as above. A1netusa.com
sells the "H-AD32" for $3.75
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There is no keying on this adapter, on either side.
This makes it possible for a misconnection. Following
these steps carefully should insure a properly connected
drive.
First, determine which end of the adapter is which.
The power leads connect to pins 43 and 44 of the adapters
"big" side. You'll notice that pins 41 and
42 are missing. Plug the "little" end of the
adapter directly into the board. Be very careful to
make sure it is centered in the 44 pin connector. The
end of the connector with the missing pins and power
leads should be away from the processor, and closest
to the power LED.
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Now you can prepare the "Big" side
of the adapter. Most IDE cables have one pin "keyed"
to prevent plugging in backwards. ("Keyed"
means that one pin is missing, and the receptacle
for it is plugged so that it fits only one way).
Line up your IDE cable with pin one (Red stripe)
closest to the processor.. If it won't plug in
you'll have to clip one pin from the adapter.
Be sure to get the right one!
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Biggest opportunities for mistakes, and their
cures:
1> Plugging the adapter into the board backwards..
The molded "R" and "B" are on the
end furthest from the processor.
2> Plugging the adapter into the board off-center.
Do a careful visual inspection.
3> Keying the connector wrong.. Pin one of the cable
is closest to the processor.
Be careful on this one.. Mine worked first try, but
I was sweating all the way.
Missing Parts
Sadly, paying top dollar for your MicroAmiga board
does not mean you get everything you expect. There were
a few things that are normally supplied with a motherboard
that do not come with this one.
Most motherboards that I have bought come with an "ATX
I/O Shield" that fits that specific board. This
is a square plate that snaps into the back of most cases
and provides the holes that the connectors poke through.
In approximate order from left to right, Keyboard and
Mouse, 2 USB's and an ethernet jack, Parallel, VGA,
S_Video and Composite Video, then the gameport and audio
output jacks..The pattern of these connectors on the
micro is unusual, because of the S-Video and composite
video connectors where the second com port used to go.
Most folks will take a common shield
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with the two COM port openings and hack the second
hole with a dremel or pair of snips to make it
fit. This works, but looks a bit messy. I searched
high and low to find the correct shield. I do
not believe there is one being made. What I was
able to find is a "mostly right" shield
with no second COM port opening. I paid nine bucks
for it, a dear price for such a simple plate.
I'll be taking it to a machinist friend to get
it punched with the correct holes.
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Since I'm trying to be complete, another "missing"
item, which seems trivial, were the nut connectors
on the back for VGA and parallel ports. They usually
have small threaded nuts so that when a cord is
connected, the thumb screws can be tightened.
That's right folks, the MicroA1 board (or at least
MY micro board) comes without them.
These can certainly be picked up at any PC shop
for little or no cost, or pilfered from an old
mobo. In the interest of providing a source for
everything, I return to a1netusa.com,
who offers a bag of 100 nuts as "S-HEX"
for 3.50, and a bag of 100 washers, currently
out of stock, as "S-RING" for another
3.50.
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One last detail.. a case badge. It's a detail that
some motherboard makers provide. I got an "Antec"
badge with my case, and also a got a "Boing Ball"
case badge with my Micro board!! I don't know if it's
normally included or just an extra from my dealer.
Too bad I didn't know it was coming, I had already
pre-built my case and made my own badge using a
do it yourself kit. Works great, and looks as good
as the printer you use to print the image.
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