IBM 689912U Hardware Maintenance Manual - Page 368

Matrox Graphics Adapter (MGA) Switch Settings There are two switches on the adapter that are used to change the way the adapter operates. Access bus . ... VGA feature connector (output only) ...BIOS Connectors for RAM expansion module Monitor connector MGA Bus connector ON Switches 12 VGA BIOS Flash Upgrade Enable - Switch 1 To upgrade the VGA BIOS, use the software utility diskette and BIOS upgrade file. 1. Remove the adapter to access the switches. 2. Set Switch 1 to On to allow re-programming of the Flash EPROM. Note: Do not leave this switch On during normal use, as the Flash EPROM in this state is susceptible to being erased without warning. 3. Reinstall the adapter. 4. Follow the instructions supplied with the flash utility. 5. Power-off the computer and remove the adapter. 6. Set Switch 1 to Off. 7. Reinstall the adapter. 8. Remove the flash utility diskette. VGA Enable/Disable Switch - Switch 2 By default, the MGA adapter VGA feature is enabled (Switch 2=Off) for single-screen operation, which means that any other installed VGA must be disabled. This switch should be set to On to support a dual-screen configuration. In this case, a VGA adapter in another expansion slot will be used for output to the second monitor. 1. Remove the adapter to access the switches. 2. Set Switch 2 to On to enable dual-screen operation. 3. Reinstall the adapter. 358 IBM PC 300/700, IntelliStation Series HMM