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Intel 80486SX

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Title: Intel 80486SX  
Author: World Heritage Encyclopedia
Language: English
Subject: List of Intel microprocessors, Intel 80376, Intel 80387SX, List of Intel Pentium Pro microprocessors, Intel 80486 OverDrive
Collection: Intel X86 Microprocessors
Publisher: World Heritage Encyclopedia

Intel 80486SX

Intel i486 SX 25MHz

Intel's i486SX was a modified Intel 486DX microprocessor with its floating-point unit (FPU) disabled. All early 486SX chips were actually i486DX chips with a defective FPU. If testing showed that the central processing unit was working but the FPU was defective, the FPU's power and bus connections were destroyed with a laser and the chip was sold cheaper as an SX; if the FPU worked it was sold as a DX. Computer manufacturers that used these processors include Packard Bell, Compaq and IBM. Back in the early 1990s, common wisdom held that it wasn't advantageous for most users to have an FPU. Thus, many typical household applications already in existence like word processing and email were designed specifically to a

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