Acer 486 User Manual
Also see for 486: User guide
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1-2User’s Guide1.1 System Board LayoutThe system board has the following major components:• 486SX, SX2, DX2, or DX4 series CPU• 4-MB onboard RAM expandable to 36 MB• Two 72-pin SIMM sockets for memory upgrade• 128-KB ROM for system BIOS and VGA BIOS• 120-pin connector for ISA riser card• System clock/calendar• Two 9-pin serial ports• One 25-pin Centronics parallel port• PS/2-compatible keyboard and mouse interface• 512-KB or 1-MB DRAM for onboard local bus VGA interface;expandable to 1 MB (for GD-5424) or 2 MB (for GD5429)• Embedded fixed disk interface• Upgradable cache memory (128-KB or 256-KB)• Optional enhanced IDE interface• Optional power daughter board that enables the system tosupport the 3.3V microprocessorsFigure 1-1 shows the board layout and the locations of the importantcomponents. |
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