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b. Data Buffer The RAM area reserved for use by mass storage, commonly called the data buffer area, or the mass storage buffer area, must contain two or more of the block buffers described above. The first byte of the entire mass storage buffer area is referenced by the word FIRST and is stored in the variable UFIRST . The last byte of the entire buffer area is located at LIMIT -1 and the value returned by the word LIMIT is kept in ULIMIT . The layout of the buffer area is: 12-2
