Lenovo ThinkPad 390E Hardware Maintenance Manual (March 1999): ThinkPad 390E o - Page 41
Memory Checkout, System Programs in Flash Memory, Flash Memory Update
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Memory Checkout DIMM are available for increasing memory capacity. Slot 1 (MB) 32 0 32 64 0 64 32 64 128 0 128 32 128 64 128 Slot 2 (MB) 0 32 32 0 64 32 64 64 0 128 32 128 64 128 128 Total Memory (MB) 32 32 64 64 64 96 96 128 128 128 160 160 192 192 256 Memory errors might stop system operation, show error messages on the screen, or hang the system. Use the following procedure to isolate memory problems: 1. Boot from and start PC Doctor. (See "PC Doctor System Diagnostics" on page 51 for details.) 2. Select Memory Test - Full and/or Memory Test Quick. 3. Follow the instructions in the message window. Note: Make sure that the DIMM is properly installed into the connector. A loose connection can cause an error. System Programs in Flash Memory: System setup programs are stored in the flash memory. Flash Memory Update: The flash memory update is required for the following conditions: New versions of system programs New features or options ThinkPad 390E 31