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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:
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