4100 MT  (250-5160)         Adding Video Memory        Faxback Doc. # 2820

Upgrading video RAM increases video performance.  Your system ships with
512 KB of video RAM, and you can upgrade it to 1 MB or 2 MB by installing
video RAM chips.

To upgrade video memory, you need 256Kx16-KB, 70-ns DRAM chips, available
from your Radio Shack store or participating dealer under part number
AX25-9999:

     To upgrade 512 KB to 1 MB, you need one chip.

     To upgrade 1 MB to 2 MB, you need two chips.

     To upgrade 512 KB to 2 MB, you need three chips.

Do the following:

     1.  Turn the computer off, unplug the power cord, disconnect all
         peripheral devices, remove the system-unit cover, and move the
         internal drive bay, and remove the power supply.

     2.  Locate the DRAM sockets on the system board.

     3.  If any add-in boards interfere with your access to the DRAM
         sockets, remove the add-in boards.

     4.  Install each chip:

         * If you are installing one DRAM chip, install it in socket U805.

         * If you are installing two chips, install them in sockets U806
           and U807.

         * If you are installing three chips, install them in U805, U806
           and U807.

Warning:  Orient the chip so that the notched end of the chip aligns to
          the notched end of the socket.

     5.  Examine your installation to ensure that the new chips are
         fully seated.

     6.  If you removed any add-in boards to reach the DRAM sockets,
         replace the add-in boards.

     7.  Replace the internal drive bay and system-unit cover.  Reconnect
         peripheral devices and plug i the power cord.  Turn on the
         system.

(ALL/all-06/16/94)