| slovo | definícia |
intel 8048
(foldoc) | Intel 8048
8048
The microcontroller used in IBM PC keyboards.
The 8048 was inspired by, and similar to, the Fairchild F8
microprocessor but, being a microcontroller, was designed for
low cost and small size. The 8048 has a modified {Harvard
architecture}, with program ROM on chip and 64 to 256 bytes
of RAM also on chip. I/O is mapped in its own {address
space}.
Though the 8048 was eventually replaced by the very popular
but bizarre Intel 8051 and Intel 8052, even in 2000 it is
still very popular due to its low cost, wide availability, and
development tools.
[Was it really __the_first__ microcontroller? Are the ROM and
RAM both on-chip?]
(2000-06-01)
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intel 80486
(foldoc) | Intel 486
486
486DX
80486
i486
Intel 80486
(Or "i486", "iAPX 80486", and "Intel DX4" but
usually just "486"). A range of Intel CISC
microprocessors which is part of the Intel 80x86 family of
processors.
The 486s are very similar to their immediate predecessor, the
Intel 80386DX. The main differences are that the 486 has an
optimised instruction set, has an on-chip unified
instruction and data cache, an optional on-chip
floating-point unit (FPU), and an enhanced {bus interface
unit}. These improvements yield a rough doubling in
performance over an Intel 80386 at the same clock rate.
There are several suffixes and variants including:
Intel 486SX - a 486DX with a faulty FPU that has been
disabled in the factory.
Intel 486DX - 486SX with a working FPU.
486DX-2 - runs at twice the external clock rate.
486SX-2 - runs at twice the external clock rate.
486SL - 486DX with power conservation circuitry.
486SL-NM - 486SX with power conservation circuitry; SL
enhanced suffix, denotes a 486 with special power conservation
circuitry similar to that in the 486SL processors.
487 - 486DX with a slightly different pinout for use in 486SX
systems.
OverDrive - 486DX-2 with a slightly different pinout for use
in 486SX systems.
RapidCAD - 486DX in a special package with a companion FPU
dummy package for use in Intel 80386 systems.
Intel DX4, Cyrix Cy486SLC.
External clock rates include 16MHz, 20MHz, 25MHz, 33MHz,
40MHz, although 16Mhz is rare now, and the 20MHz processors
are often clock doubled.
The 486 processor has been licensed or reverse engineered by
other companies such as IBM, AMD, Cyrix, and {Chips &
Technologies}. Some are almost exact duplicates in
specications and performance, some aren't.
The successor to the 486 is the Pentium.
(1995-02-21)
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