SYSTEM.INI Entry Required for Zenith 386 (57809)


The information in this article applies to:

  • Microsoft Windows 3.0
  • Microsoft Windows 3.0a
  • Microsoft Windows 3.1
  • Microsoft Windows 3.11
This article was previously published under Q57809

SUMMARY

For proper operation under Microsoft Windows in 386 enhanced mode, the Zenith 386 requires the following entry in the [386Enh] section of the SYSTEM.INI file: 
EMMExclude=E000-EFFF

MORE INFORMATION

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

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Modification Type:MinorLast Reviewed:7/7/2005
Keywords:KB57809
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