This code defines two constants using the C preprocessor directive...

This code defines two constants using the C preprocessor directive #define. These constants are commonly used in programming related to data encoding, particularly the Modified Frequency Modulation (MFM) encoding scheme, which is used in magnetic storage.

Here’s what the code does:

1. #define DAAM_OFF 0xFB:

   • Creates a macro named DAAM_OFF with the value 0xFB (hexadecimal for 251 in decimal).
   • This constant is likely used to represent a specific data marker or identifier in a system utilizing MFM encoding.

2. #define DAAM_ERASED 0xF8:

   • Creates a macro named DAAM_ERASED with the value 0xF8 (hexadecimal for 248 in decimal).
   • This typically represents an "erased" or placeholder data marker in an MFM data structure.

These definitions are generic constants associated with the Data Address Mark (DAAM) in MFM encoding, which is used in floppy disks and older magnetic storage systems. The specific meanings depend on the context of the system being developed, such as differentiating between normal data and a special "erased" marker.