2500 SX/20 (250-4077) Video Memory Faxback Doc. # 1190 Note: Use (MX-3750) Video Memory Upgrade. Your computer has 256 KB of video memory permanently installed on the main logic board. Video memory is separate from system memory. The video memory enables you to use the standard video modes and some Super VGA modes. Use the Super VGA modes only with applications designed to support them. Some Super VGA modes require a multiple-frequency monitor, video drivers, or additional video memory. To use the 640 x 480, 256-color graphics mode and the 1024 x 768, 16-color graphics mode, you must increase the amount of video memory to 512 KB. Use a 256 KB Video Memory Upgrade Kit (MX-3750) to upgrade the video memory to 512 KB. This kit contains two 40-pin memory chips for the two video memory chip sockets on the main logic board. The kit is available through Radio Shack stores. If you choose not to install the kit yourself, a trained technician at a Radio Shack Service Center can install it for you. CAUTION: Incorrect installation of the video memory chips can damage the chips or your main logic board. Install the chips carefully. Install the video memory upgrade kit as follows: 1. Refer to Faxback Doc. # 1194 for Main Logic Board Layout to locate the two video memory chip sockets. To reach the video sockets more easily, turn the computer so that the back of the computer faces you. 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 main logic board is labeled 1 at the Pin 1 end of the memory chip sockets. 3. Orient the memory chip so that the dot on the notched end of the chip aligns with the corner of the socket that is labeled 1. 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 512 KB of video memory. The video memory is not checked when diagnostics are performed at system startup.