Epson 386SX - Manual (Page 145)

Two sockets in each bank accept only 256KB SIMMs. These
sockets are labelled 7A, 8A, 12A, and 13A. The rest of the
sockets accept only 1MB SIMMs. You must fill all of the 256KB
SIMM sockets before using any of the 1MB sockets.
SIMMs must be distributed evenly between the two banks. For
example, if you want to have 4MB of memory, install two
256KB SIMMs and one 1MB SIMM in the left bank and two
256KB SIMMs and one 1MB SIMM in the right bank. You
cannot install both of the 1MB SIMMs in just one of the banks.
Note
Once SIMMs have been installed, you should be sure your
dealer has set a jumper on the SIMM card before you turn on
your computer. See “Changing Jumper Settings” later in this
chapter for more information.
After SIMMs have been installed in your computer, you need to
run the Setup program on your Reference diskette to set the
computer’s memory configuration, as described in Chapter 2.
Also see “Post-installation Setup,” later in this chapter.
Note
If you want to use extended memory as expanded memory,
you can use the EMM386,SYS utility, See “Using Memory
Beyond 640KB” in Chapter 4 and your MS-DOS Reference
Manual for more information.
Installing Options 5-3