PRB: Cyrix Processor May Cause Build FailureArticle ID: Q112563 The information in this article applies to:
SYMPTOMSWhen building a project using one of the products mentioned above, one or more of the following problems may occur:
CAUSEA 386DX or 386SX computer was upgraded using the Cyrix "LC" family of processors in place of the required processor from the Cyrix "RX" family. For the 486DRX family, an early lot number had a bad mask that exhibits a similar problem. It can be identified by the number on the top of the chip, under the heat sink. The bad lot will be xx1###x where x is a letter and # is a number. About 50% of these chips also fail due to the same timing conditions as those above. MORE INFORMATIONCyrix builds CPUs for both OEMs and end users that plug into 386DX and 386SX sockets. The end user CPU family is labeled 486DRx or 486SRx, while the OEM family of microprocessors is labeled 486DLC or 486SLC. The RX or end user family of microprocessors differs from the LC or OEM family as follows:
These fundamental differences in the chip family architecture allow Cyrix to provide OEMs with a low cost, simple board and BIOS modification solution to build 486 systems using the LC family, while giving end users a distinct cost effective upgrade solution with the RX family. Using an LC family processor in a system is not safe unless the necessary hardware and BIOS modifications have been made in the design of the motherboard. These changes, although not difficult for an OEM to make, are not possible for an end user. Therefore, Cyrix does not support end users who upgrade their 386DX or SX systems using the LC family of processors. The following problems can occur when using the LC family of processors as an upgrade to a 386 system:
Because of this, problems can surface when using Microsoft development tools that write to disk, such as Microsoft LINK. End users who have upgraded using the LC family of processors should return the LC processor and purchase an RX family processor. If further information is needed, Cyrix can be contacted at (214) 968-8387. Additional query words: 8.00 8.00c zero errors warnings Keywords : kb3rdparty TlsMisc Version : 1.0 1.5 1.51 1.52 2.0 2.1 4.0 5. Platform : NT WINDOWS Issue type : kbprb |
Last Reviewed: July 26, 1997 |