Apple IIe Card - Manual (Page 104)

2. Click the button for the speed you want.
When you close the Apple IIe Option Panel, you see a message
indicating that the changes you made in the General Controls panel
will not take effect until you restart the Apple IIe Card.
3. Click the Restart IIe button to restart the Apple IIe Card.
The Apple IIe Card restarts, with the new Speed setting in effect.
If you don’t want the new setting to take effect yet, click the
Continue button.
▲
Warning: Be sure to save your work on a floppy disk before clicking
the Restart IIe button. Any work that has not been saved on a disk
will be lost.
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Chapter 5: Reference 88