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=<Boolean>
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.