Microsoft KB Archive/84785

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IBM PS/2 Model 55SX Hangs at Start Up with Windows 3.1

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Q84785

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The information in this article applies to:


 * Microsoft Windows versions 3.1, 3.11

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SUMMARY
Running Microsoft Windows version 3.1 in 386 enhanced mode on an IBM PS/2 model 55SX with a SCSI controller may cause your system to stop responding (hang) when you start Windows. When this happens, you briefly see the Windows logo, followed by a blank screen with a blinking cursor. The hard disk drive light stays on.

To run Windows in 386 enhanced mode on a PS/2 model 55SX, add the line MCADMA=OFF to the [386Enh] section of the SYSTEM.INI file.

MCADMA= Designed for PS/2 Model 55SX Only
The MCADMA= switch is designed for use on IBM PS/2 model 55SX computers only; it should not be used with other PS/2 models.

The SYSINI.WRI file defines the MCADMA= switch as follows:

  MCADMA=

Default:  True for MCA computers; False for all other computers

Purpose:  This specifies whether Windows should use the MCA extensions to direct memory access (DMA). This setting applies to MCA computers only. Disable this setting if you are using an MCA computer but the DMA extensions are not implemented.

To Change: Use Microsoft Windows Notepad to edit the SYSTEM.INI file. The PS/2 model 55SX is manufactured by a IBM, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Additional query words: 3.10 ps2 mca lock freeze up stop ps-2 microchannel micro channel boot bootup

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Technology : kbWin3xSearch kbWin310 kbWin311