433DX/450DX2/466DX2  (259-7708)      Video Memory      Faxback Doc. # 2750
OMNI II

NOTE: 256K x 4 DRAMS can be ordered under Catalog Number 250-1082.

256K x 16 DRAM ZIP chips can be ordered through Third Party Products.

INSTALLING VIDEO MEMORY

The computer supports up to 2MB of video memory.

UPGRADING TO 1MB OF VIDEO MEMORY

IF your computer was shipped with 512KB of video memory, you can upgrade
to 1MB of video memory by inserting four 256KB x 4 DRAM DIP chips.  Use
50 ns or faster, fast page-mode chips.  (Video memory speed is a measure
of access time, so a higher number reflects a slower speed).

To install a DIP chip, align its notch with the notch on the socket.
Taking care not to touch or bend the pins, insert the chip into the
socket.

UPGRADING TO 2MB OF VIDEO MEMORY

If your computer has 1MB of video memory, you can upgrade to 2MB of video
memory by inserting two 256Kb x 16 DRAM ZIP chips.

The base video memory is rated at 50 ns.  If you install 60 ns or 60 ns
chips, set the Video Memory Speed jumper blocks for the slower speed.
(Video memory speed is a measure of access time, so a higher number
reflects a slower speed.)

To install a ZIP chip, align its notched corner with the end of the socket
near the riser card connector.  Taking care not to touch or bend the pins,
insert the chip into the socket.

CHANGING JUMPER SETTINGS

A JUMPER BLOCK is a set of small, metal pins on a circuit board.  A
plastic cover, called a JUMPER, can be installed on or removed from a
pair of pins to complete or break an electrical connection.  A circuit
board's jumper settings affect various board functions.

The jumpers on your computer's main logic board are set at the factory for
your system.  However, if you install certain hardware options or choose
to enable or disable certain system features, you might need to change
some jumper settings.  If you remove a jumper, PARK it on one pin for
possible future use.

CAUTION:  Incorrect jumper settings can cause a malfunction or a decrease
          in performance.  If you prefer, you computer dealer can arrange
          to have jumper settings changed for you.

(smc-12/08/93)