Epson Equity 286 PLUS - Manual (Page 81)

If you do not have a word processing program capable of saving
an ASCII text file, you can modify CONFIG.SYS using the
MS-DOS EDLIN or COPY CON command. See your MS-DOS
Reference Manual for instructions.
Using EMM286.SYS options
You can include optional parameters in the DEVICE=
command line to tailor the way the memory manager works with
your system. The table below summarizes the EMM286.SYS
options. Each option is described in more detail following the
table.
The M[n] option specifies a particular 64KB page frame address
for EMM286.SYS. The value
n must be a number from 1 to 9 to
indicate one of the following addresses:
Enhancing
System Operations 4-9