IBM PERSONAL SYSTEM/2 MODELS 56 SLC AND 57 SLC 486 SLC UPGRADE MODIFICATION Contents Announcement Letter Number 392-223 dated September 29, 1992 US - Last Revised on September 29, 1992 Brief Description of Announcement, Charges, and Availability This promotion, described in Marketing Announcement 392-148, dated June 16, 1992, has been modified. Effective immediately, the order end date has been extended to December 31, 1992. The Date of Installation must occur on or after June 11, 1992, but no later than January 29, 1993. This promotion enables customers who purchase a PS/2 (R) Model 56 SLC or 57 SLC through year end to order the 486SLC2 Processor Upgrade at a special low price of $259. To order the 486SLC2 Processor Upgrade, the completed IBM PS/2 486SLC2 Processor Upgrade Order Form, along with proof of purchase, payment of $259, plus applicable sales tax, must be received by IBM no later than May 31, 1993. The PS/2 486SLC2 processor upgrade is available beginning October 30, 1992. Customers who have already mailed the 486 SLC (TM) Upgrade Information Request Form will receive ordering instructions by that date. All other terms and conditions remain unchanged. (R) Registered trademark of International Business Machines Corporation. (TM) Trademark of International Business Machines Corporation.