TANDY 2000  (260-5103)               Memory             Faxback Doc. # 1943

Note: To expand from 128K to 256K you must install 128K Memory Expansion
Module 26-5160 before installing any Memory Expansion Boards.

This Chart is for Memory Expansion from 256K to:

                   384K        512K           640K         768K

Memory Adapter    26-5161   26-5161(1)     26-5161(2)    26-5161(2)
Add to Adapter              26-5162(1)#    26-5162(1)    26-5162(2)#

The 26-5162 contains eighteen 64K X 1 DRAMS at 150 nanoseconds.
The 26-5161 is a Memory Expansion Board.

Note: The 26-5162 chip kit can also be ordered by part # number AXX-7142.

Jumper Settings:

Board       Memory Kit       Jumper         Memory Level

26-5161                       B2-S             384K
             26-5162          B2-S             512K

26-5161 (2nd)              B3-S & E-F          640K
             26-5162       B3-S & E-F          768K

Installation:

NOTE: Installation differs slightly, depending upon whether the board is the 
first or second External 128K Board installed. Be sure to note the difference 
in Step 4.

1. WARNING: Turn off all equipment. If it is on, you could damage the central 
   processing unit, as well as the option board.

2. To avoid possible static charge build-up, touch a grounded metal object to 
   ground yourself before you begin.

3. You can install the External 128K Board in any slot. If, however, you have 
   a Monochrome Graphics Option Board (25-5140), do not install the memory 
   board in the lowest slot. The graphics board must go there.

After selecting a slot, "unlock" the panel covering it. Do this by pulling the 
buttons on either side of the panel. Remove the panel.

4. If you are adding the 128K RAM Upgrade, do so now as described in the 
   instruction sheet provided with the upgrade kit.

5. Unlock the buttons on the External 128K Board's panel. (NOTE: Handle thee 
   pan containing the board, NOT the board itself.) Slowly slide the pan 
   between the guides along thee sides of the card slot until the board meets 
   the connector.

6. Then apply steady, equal pressure to both edges of the panel (near the 
   buttons to push the pan all the way in and "seat" the connector. Push the 
   buttons in to lock the board into position.

To test you memory board, start up MS-DOS as instructed in Introduction to the 
Model 2000. Check the copyright/startup message to see if it indicates the 
correct amount of memory (128K plus the amount added). If this is not the 
case, contact personnel at the Radio Shack Computer Center or Radio Shack 
store at which you purchased the board.