Tandy 1000 MS-DOS Reference Manual page 351

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Appendix B / Configuring }Our System
Defines Drive B as a 3lfz-inch floppy disk drive. Note that you
can omit the IF parameter, which defaults to 2 for a 3lfz-inch
drive.
FCBS
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1 FeBS
nl,n2
Sets the number of files opened by file control blocks that can be
opened at anyone time, and lets you specify a number of these
to protect from inadvertent closure.
nl specifies the number of files opened by FCBs that can be
opened at anyone time. nl can be in the range 0 to 255. The
default value is 4.
n2 specifies the number of files opened by FCBs that MS-DOS
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cannot close automatically if an application tries to open morE(
than nl files by FCB. This option protects the first n2 files
opened by FCBs from being closed. n2 can be in the range 0 to
255. The default value is O.
Example:
fcbs=4,2
specifies that four files can be open, and protects two files.
FILES
FILES
=
number
Sets the maximum number of files that MS-DOS can access at
one time. The default is ten files. Allocating more files than
required by your system or application decreases available
memory.
number is the number of open files that the system calls can
access. (System calls in the range 2FH to 60H are compatible
with the XENIX operating system,) The maximum number is
99.
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