Installing an IBM system board is just the reserve of the above,slide the board into the case from the left at a sligth angle .when the left edge of the board clears the edge of the case,lower it until it sits flat in the case,finally slide it over to the right flat in the bottom of the computer until it stops.you might have to push it back a put to the left to make the screw holes line up so you can fasten the board into place before you can reinsert the system board ,you must have the nylon fasteners locked into their proper holes,which are indistingguishable from those to be used by the screws,figure shows the size and proper screw and fastener placement of the IBM PC system board the XT system board and AT system board.
Planar board installation is nothing more than properly aligning the board with the stanchions molded in the case,dropping it in place and securing the screws.
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