2500 SX/33  (250-1623) Adding additional Video Memory  Faxback Doc. # 1599

   Use one 256K Video Memory Upgrade Kit     25-1082A

Your computer has 256KB of video memory permanently installed on the main
logic board.

The following video modes require 512KB of video memory:

* 640 x 480, 256-color graphics mode
* 800 x 600, 256-color graphics mode
* 1024 x 768 (interlaced and non-interlaced), 16-color graphics mode

To upgrade to 512KB of video memory, you can install two 20-pin memory
chips from a 256KB Video Memory Upgrade Kit. These chips fit into the two
video memory upgrade sockets (U15 and U17) on the main logic board.

Before making the upgrade, check your application program documentation to
be sure your applications support the Super VGA modes you want to use.

CAUTION: Carefully install the video memory chips as follows. Incorrect
installation can damage the chips or main logic board.

1. Locate the two video memory chip sockets (U15 and U17 on the main logic
   board.

┌───────────────┬───┬─┬─┬─┬─┬───────┬──────────┬─┬────┬───┬─┬─┬─┬────────┐
│               └───┘ └─┘ └─┘       └──────────┘ └────┘   └─┘ └─┘        │
│                                ┌─┐                                     │
│                 °              │ │<── Riser Card                       │
│                 °              │ │                                     │
│                 °              │ │                               ┌─┬─┐ │
│                                │ │                               │ │ │ │
│ ┌───────┐<── Video Memory      │ │                               │ │ │ │
│ ├───────┤    Upgrade           │ │                               │ │ │ │
│ └───────┘<── Sockets           │ │                 ┌─────────┐   │ │ │ │
│                                ├─┤                 │         │   │ │ │ │
│                                │ │                 │         │   │ │ │ │
│   ┌───┐                        │ │                 │         │   │ │ │ │
│   │   │                        │ │                 └─────────┘   └─┴─┘ │
│   └───┘                        │ │ ┌──────────────┐ ┌───────────┐      │
│                                └─┘ └──────────────┘ └───────────┘      │
└────────────────────────────────────────────────────────────────────────┘

2. Remove one chip from the antistatic packaging. Pin 1 of the chip is 
   indicated by a dot and a notch on one end. The Pin 1 end of each video 
   memory socket has a matching notch.

3. Orient the memory chip so that the dot or notch on the chip aligns with
   the notched end of the socket.

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

5. Repeat Steps 2 through 4 for the second memory chip.

When you restart the computer, it has 512KB of video memory.

NOTE: The memory amount displayed during the startup diagnostics includes
      only system memory. Video memory is not checked at startup.


(jej/tmc-05/06/95)