<HTML><HEAD><TITLE>All_About_Your_64-Online-Help Version 0.64</TITLE></HEAD>
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 $DF21/57121:            Clock Port En-/Disable
 (or $DE01/56833)

   +-------+---------------------------------------------------------+
   | Bit 0 | 0 = disable Clock Port, 1 = enable Clock Port           |
   +-------+---------------------------------------------------------+
   Note: Location depends on Bit 3 of <A HREF="MMC01.HTM">$DF11</A>.

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