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The Intel 486, officially named i486 and also known as 80486, is a microprocessor introduced in 1989. It is a higher-performance follow-up to the Intel 386.It represents the fourth generation of binary compatible CPUs following the 8086 of 1978, the Intel 80286 of 1982, and 1985's i386.
While capable of encoding values from 8 to 31 (values 0 to 7 map to ModR/M-encoded variants of the older POP instruction, making them unusable for XOP), only maps 8, 9 and 0Ah were ever used: map 8 for instructions that take an 8-bit immediate, map 9 for instructions that don't take an immediate, and map 0Ah for instructions that take a 32-bit ...
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.
The ODPR chips had 168 pins and functioned as complete swap-out replacements for existing chips, whereas the ODP chips had an extra 169th pin, and were used for inserting into a special 'Overdrive' socket on some 486 boards, which would disable the existing CPU without needing to remove it (in case that the existing CPU is surface-mounted). ODP ...
Will change OperandSize from 16-bit to 32-bit if CS.D=0, or from 32-bit to 16-bit if CS.D=1. 67h: AddressSize override. Will change AddressSize from 16-bit to 32-bit if CS.D=0, or from 32-bit to 16-bit if CS.D=1. The 80386 also introduced the two new segment registers FS and GS as well as the x86 control, debug and test registers.
The official Cyrix 5x86 website boasted about several features of the chip that were disabled by default in the final versions. The most controversial of these features was the branch prediction feature, which was enabled in the benchmarks results on the company website when comparing the chip to Intel's Pentium processor.
[7] In the past: ALi (x86 products went to Nvidia through the ULi sale) Nvidia (M6117C - 386SX embedded microcontroller) Auctor [8] / ACC Micro [9] - Maple SoC (Cx486DX4 [10] core at 100 to 133 MHz) Advantech - EVA-X4150 and EVA-X4300 (SoCs with 486SX-compatible processors at 150 MHz and 300 MHz, respectively) [11]
Instead of integrating memory on the motherboards, Compaq put the RAM chips on a daughtercard that plugs into a 32-bit bus slot on the motherboard. This slot is bespoke to the Deskpro 386 and allows the transfer of information to and from the bus in 32-bit words. For the initial models, the daughtercard carries 1 MB of RAM stock, and can be ...