THE A-TOP AT900 MID-TOWER
Last updated: 2/10/2000
BENT METAL. The AT900 has
a fairly solid feel and a good layout. All surfaces have a shiny, chrome-like
finish. The edges on the drive bays are rolled for strength and to
reduce the possibility of cuts during assembly. Other edges are
thick and smooth to the touch.
The case has two removable sides which
slide into place (not quite as easily as the HX45) and have indents along
the rear edge to aid in removable. The left side is secured by two knurled
screws at the rear of the case. The right side is fastened with phillips-head
screws. Although adequate, the sides would probably be a little better
(and work better) if they were rolled at the top and bottom, had ventilation
holes along the bottom, and had wider clips at the front.
interior of the AT900 is divided into two compartments. The first occupies
the top 7 1/4" of the case and contains power supply and the 5 1/4" drive
bays. The other compartment is clearly the motherboard compartment and it
is wide open. The only significant protrusion is the 3 /12" drive
bay which is not removable.
AT900 includes a pull-out drawer for the motherboard and expansion boards. It
is secured with spring clip along the bottom of the rear of the case and
easily removed for motherboard, etc. installation. This would make
it very easy to assemble PC's in a production line. When finally assembled
the drawer should be further secured with additional screws along the left
side of the back and in two places provided in the interior for greater chassis
rigidity and grounding. It would probably improve the ventilation of
this case if there were vent holes above the expansion board slots at the
back of the drawer.
AT900 has an A.3.a I/O (Intel "Universal") back panel which cleverly
clips onto the back of the drawer. I gave it a slight whack with a
screw driver to lock it into place. The panel matches all of ATX motherboards
reviewed in the Digest to date. It is made of thick metal and is clearly
labeled. (I erroneously took a picture of the inside side of the panel
and presently have no camera to retake it.) Be careful, this is one
of the few items that could cause a cut during installation.
There are two DB25 and one DB9 chassis knockouts
on the back of the drawer and above the ATX I/O panel cutout to accommodate
one printer and the two serial connectors which come mounted on brackets
with Baby AT motherboard. I would suggest one more knockout to mount
the PS/2 mouse connector which ships with many quality Baby AT boards.
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