Radio Shack PC-2 TRS-80 Owner's Manual page 16

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Identification Tag. Place the permanently adhesive Identification Tag here.
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Battery Cover. Remove this Cover to gain access to the batteries which supply power to the PC-2. Be careful
not to lose the screw which secures the Cover; it is not attached to the Cover when removed.
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External Power Supply Jack. If you have an external power supply adaptor (optional/extra), plug it in here.
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