At/atx, Election, Figure 3-9: installing the pcie card – Maple Systems PC419C User Manual
Page 42: Figure 3-10: at/atx mode selection, 9 at/atx mode selection

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Step 5:
Secure the expansion card. Once the PCIe card is correctly installed in the
system, reinsert the previously removed retention screw to secure the card to
the I/O interface panel.
Step 0:
Figure 3-8: Installing the PCIe Card
3.9 AT/ATX Mode Selection
AT and ATX power modes can both be used on the PC400C Series Panel PC. The
selection is made through an AT/ATX switch on the I/O interface panel. The switch is
shown below.
Figure 3-9: AT/ATX Mode Selection