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=>     R0 =     213 (&D5)
     R1 =     EOR value
     R2 =     AND value

<=     R0 preserved
     R1 =     previous pitch
     R2 =     bell duration (see OS_Byte 214)

This call reads or sets the bell pitch, which is an BBC style frequency in the range 0-255. The default pitch is 100.

See PRM 1, page 664

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