3800 HD  (250-3533)          Memory Upgrades           Faxback Doc. # 1438

Installing Single In-Line Memory Modules:

Your computer has 640 KB of standard memory and 1024 KB of extended memory.
The computer assigns memory between 640 KB and 1 MB as Shadow RAM. Part of 
the shadow RAM shadows the machine BIOS (basic input/output system) and 
another part of it may be used by EMM386.EXE (the MS-DOS memory manager). 
Refer to your MS-DOS User's Manual for detailed instructions on how to do 
this.  Some software requires extra memory to run correctly and
efficiently.  Also, adding extra memory can sometimes make the computer run
faster. You can expand your computer's 2 MB memory to 4 MB by installing a
2 MB single in-line memory module kit.

These memory modules can be ordered from Tandy National Parts.  Order two 
MX-7961, listed under catalog number AX2503504.  When contacting National 
Parts, refer to the AX catalog number, not the catalog number for the 
computer.

NOTE:  Be sure to specify "Low-Profile SIMMS" when ordering.  The part can
       sometimes be substituted for a "High-Profile SIMM".  The part will
       work, but you cannot close the lid or replace the cover over the 
       SIMMS.

       25-3504 contains 2 X 1MEG 80ns. SIMM chips.

CAUTION:  Use only specified SIMMs with the computer.

Use the following procedure to install the SIMMs:

1.  Turn off the computer, and disconnect the AC adapter.

2.  Find the compartment cover near the top row of keys. Then, remove the 
    cover by lifting up the front edge of the cover.

3.  Position the SIMM so that its two modules face you and the two holes
    are at the top.

4.  Install one SIMM in the front slot by tilting the card away from you
    and pushing the card into the slot. Then, tilt the top of the card
    toward you until it snaps into position.

5.  Install the other SIMM in the remaining slot, as described in Steps 3
    and 4.

6.  Close the cover. Then, turn on the computer.


(jej/all-08/24/95)