If its an at case then no you cant put an atx board in it without a lot of modifcation. If you look at the harness comming off the power supply an ATX ps will have a rectangular plug with 2 rows of pins( total of 20 pins) the older AT supplies only had single rows of pins(6 pins in each connector) and there were 2 connectors for the mobo that went side by side.
if its an AT mobo the power connector will be longer and the AT psu will have 2 parts to connect to the mobo for power, to fill the longer connector on the mobo.
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