4850 EP  (250-5143)            Video Memory             Faxback Doc. # 1013

To increase the amount of video memory from 512 KB to 1024 KB (1 MB), you 
can install an optional video memory upgrade kit on the main logic board. 
Order two of Cat. # 250-1082A Video Memory Upgrade Kit from your Radio 
Shack Store.  This kit contains two 256 KB x 4, 70 ns DIP DRAM chips.

The 256-color, 1024 x 768 and 256-color, 800 x 600 graphics modes require 
1 MB of video memory.

CAUTION: Static electricity can damage electronic components in a computer.
Before opening the computer, discharge any accumulated static electricity 
from yourself by touching a grounded metal object.

1. Turn off the computer, and disconnect all cables.

2. Open the computer. 

3. Remove a chip from the antistatic packaging.

4. Orient the chip so that the U shape on the chip aligns with the U shape 
   on the socket.

   If the chip has no U-shaped marking, align Pin 1 of the chip with Pin 1 
   of the socket. Pin 1 of the chip is marked by a corner dot. Pin 1 of the
   socket is to the left of the U.

5. Carefully press the chip into the socket. Be sure that the pins of the 
   chip do not bend.

6. Repeat Steps 3 through 5 to install the remaining three DRAM chips.

7. Set Switch 6 of SW1 to OFF to indicate that the computer now has 1024 KB of
   memory installed. Refer to "Main Logic Board Layout" to locate SW1.

8. Close the computer.

(smm/tmc-04/17/95)