Microsoft KB Archive/58301

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SYSTEM.INI Setting Required for Epson 386 Portable

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Q58301

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The information in this article applies to:


 * Microsoft Windows versions 3.0, 3.0a, 3.1, 3.11

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SUMMARY
The following setting is required in the [386Enh] section of the Microsoft Windows SYSTEM.INI file for proper 386 enhanced mode operation on the Epson 386 Portable:

EMMEXCLUDE=E000-EFFF This requirement is due to nonstandard ROM mapping by the Epson 386 Portable.

MORE INFORMATION
The reason this is needed is because the Epson 386 Portables have ROM at these segment addresses that do not have proper ROM signatures. Enhanced mode normally automatically excludes regions of the machine address space that is occupied by ROM, but this requires that the ROM be correctly marked as ROM. Unfortunately, Epson copied IBM's design for the PS/2 machines (PS/2s also have improperly marked ROM at E000-EFFF). This region is properly excluded on PS/2 MCA machines through MCA specific code, but not on the Epson machines because Epson machines are ISA machines.

Additional query words: 3.00 3.0 3.0a 3.00a win30 KBHW Win31 3.10 3.11

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Issue type :

Technology : kbWin3xSearch kbWin300 kbWin300a kbWin310 kbWin311