Changes
/* Usage in CPCs */
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Used by [[Cirkit serial interface]](for use with the included Prestel Link modem)): Clock source and IFADFh - Cirkit 8251 UART Data register FBDFh - Cirkit 8251 UART Status/O Ports are unknownControl registerTX clock source is fixed (19.2KHz), RX clock source can be selected via DTR bit (1200Hz or 19.2KHz).
== Registers ==
