486SX - definizione. Che cos'è 486SX
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Cosa (chi) è 486SX - definizione

32-BIT MICROPROCESSOR MODEL RELEASED IN 1991
486SX; 486 SX; 486sx; I486SX; I486SX2; Intel 80486SX2; 80486SX2

486SX         
Intel 80486SX         
Intel's i486SX was a modified Intel 486DX microprocessor with its floating-point unit (FPU) disabled. It was intended as a lower-cost CPU for use in low-end systems.
Intel 486SX      
<processor> An Intel 486DX microprocessor with its floating-point unit disconnected. All 486SX chips were fabricated with FPUs. If testing showed that the CPU was OK 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. [Was this true of all 486SX chips?] Some systems, e.g. Aopen 486SX, allowed a DX to be plugged into an expansion socket. A board jumper would disable the SX which was hard to remove because it was surface mounted. Some SX chips only had a 16-bit wide external data bus. The DX has a pin to select the data bus width (16 or 32). On the smaller SX, that line is hard-wired to 16 inside the package. This is similar to the 286 SX, which was a 16-bit processor with an 8-bit external data bus. The Jargon File claimed that the SX was deliberately disabled crippleware. The German computer magazine, "c't", made this same theory the basis of an April Fools Joke. They claimed that if one drilled a hole of a specified diameter through the right point on a SX chip, this would brake the circuit that disables the FPU. Some people actually tried (and then bought themselves new processors). (1997-02-14)

Wikipedia

Intel 80486SX

The i486SX was a microprocessor originally released by Intel in 1991. It was a modified Intel i486DX microprocessor with its floating-point unit (FPU) disabled. It was intended as a lower-cost CPU for use in low-end systems, adapting the SX suffix of the earlier i386SX in order to connote a lower-cost option. However, unlike the i386SX, which had a 16-bit external data bus and a 24-bit external address bus (compared to the fully 32-bit i386, its higher-cost counterpoint), the i486SX was entirely 32-bit.: 117