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IBM A20M Specification Guide

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For drivers:  http://www.us.pc.ibm.com/support/thinkpad/thinkpad_support.html
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A20m
A20m
A20m
A20m
A20p
11U/12U
21U/22U
31U/32U
41U/42U
61U/62U
The purpose of this spreadsheet is to provide a guide to the compatibility within and between the ThinkPad A series models.
The spreadsheet contains information that can be used to highlight the compatibilities and differences between ThinkPad models when doing transition planning and/or to build an initial software image.
This package is NOT intended to be a list of the latest levels of the software drivers needed to build an image.  Although it is current as it is being created, it will become out of date over time.  
For the current list of the levels of the latest software drivers, see the support page on the IBM ThinkPad web site at:
http://www.ibm.com/pc/us/support/thinkpad/thinkpad_support.html
 
Supported OS Version
   PC-DOS 7.0
No
No
No
No
No
PC DOS 2000
No
No
No
No
No
   MS-DOS 6.22
No
No
No
No
No
   Windows 3.11
No
No
No
No
No
   Windows for WG 3.11
No
No
No
No
No
   Windows 95 (OSR1 - Win95 Retail + Service Pack 1)
Yes
Yes
Yes
Yes
Yes
   Windows 95 (OSR2/2.1 - adds USB and new IE browser)
Yes
Yes
Yes
Yes
Yes
  Windows 98
Yes
Yes
Yes
Yes
Yes
Windows 98 SE
Yes
Yes
Yes
Yes
Yes
   Windows NT Workstation 3.51
No
No
No
No
No
   Windows NT Workstation 4.0 Service Pack 3
Yes
Yes
Yes
Yes
Yes
Windows NT Workstation 4.0 Service Pack 4
Yes
Yes
Yes
Yes
Yes
Windows NT Workstation 4.0 Service Pack 5
Yes
Yes
Yes
Yes
Yes
Windows NT Workstation 4.0 Service Pack 6a
Yes
Yes
Yes
Yes
Yes
Windows 2000
Yes
Yes
Yes
Yes
Yes
   OS/2 Warp 4.0
No
No
No
No
No