IBM ThinkPad 755CX Manual page 250

Advanced Information for PC Cards
Operational Considerations for PCMCIA
234
IBM ThinkPad 755CX User's Guide
Consider the following according to your operating system:
Software Considerations for OS/2
OS/2
The following is a sample of the CONFIG.SYS file for OS/2:
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You might need to update the CONFIG.SYS file after you have
installed the PCMCIA software. If you make any changes to your
CONFIG.SYS file, keep in mind the following rules for PCMCIA
software:
Rule 1 The Card Services driver (PCMCIA.SYS) must be listed
before any other PCMCIA drivers. The Resource Map Utility
(ICRMU01.SYS) and Socket Services driver
(IBM2SS01.SYS) must be listed in this order. These
modules must be listed just after the Card Services driver.
Rule 2 The PC Card Client device drivers must be listed after the
Socket Services (IBM2SS01.SYS) and before the Power
Management Utility ($ICPMOS2.SYS).
Rule 3 The Power Management Utility ($ICPMOS2.SYS) should be
listed at the end of the CONFIG.SYS file.
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