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—selling for US$ 258—adapting the SX suffix of the earlier i386SX in order to connote a lower-cost option.

Intel486 （インテルよんはちろく）は、 インテル の x86 系 マイクロプロセッサ で、 386 の後継製品である。 当初の名称は「80486」で、後に廉価版の「486SX」をラインナップに追加した際に、従来の80486を「486DX」と改名し、同時にそれらの総称として「i486」の 商標 を使うようになった。 "i" を付けたのは、米国では番号だけの名前は商標権を取れない（登録できな …

i487SX (P23N): i486DX with one extra pin sold as an FPU upgrade to i486SX systems; When the i487SX was installed, it ensured that an i486SX was present on the motherboard but disabled it, taking over all of its functions.

2024年4月3日 · Intel released the 486SX in April 1991 and retroactively created the 486DX to counter AMD’s new 386 clone CPU. The actual difference between the 486 DX and SX has …

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—selling for US$ 258—adapting the SX suffix of the earlier i386SX in order to connote a lower-cost option.

Intel squeezed 1.185 million transistors onto a 67-square-millimeter die applying 1.0-micron complementary metal oxide semiconductor (CMOS) fabrication techniques. The Intel 486SX central processing unit (CPU) was released in September 1991 in three models with different clock speeds: 16 MHz, 20 MHz, and 25 MHz versions.

Intel's i486SX was a modified Intel 486DX microprocessor with its floating-point unit (FPU) disconnected. All early 486SX chips were actually i486DX chips with a defective FPU.

32-bit RISC-Technology Core — The embedded Intel486 SX processor performs a complete set of arithmetic and logical operations on 8-, 16-, and 32-bit data types using a full-width ALU and eight general purpose registers. Single Cycle Execution — …

Designed by Deksor, computerguy096 and Zago. (c) 2019-2025 All wrongs reversed.

There was a 487 which was actually a 486 with the math co processor enabled. If the motherboard had this slot for the 487, the SX cpu would be disabled and the 487 cpu would take over all processing.