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Rockwell$505145$ - translation to English
ROCKWELL HARDNESS SCALE BASED ON INDENTATION HARDNESS OF A MATERIAL WITH A 120° DIAMOND SPHEROCONICAL UNDER 150 KGF
Rockwell hardness test; Rockwell Hardness Scale; Rockwell hardness scale; Rockwell+scale; Rockwell hardness; Rockwell Constant Hardness Rating; Rockwell test
Rockwell
n. Norman Rockwell (1894-1978), pintor americano conocido por sus clásicas escenas americanas; compañía americana con sede en California, fabricantes de controles electrónicos y sistemas de comunicación
rockwell
WIKIMEDIA DISAMBIGUATION PAGE
Rockwell (disambiguation)
Uno de los métodos y escala para determinar la dureza relativa de un objeto, usualmente de un metal como el acero.
Definition
6502
<hardware> An eight-bit microprocessor designed by {MOS
Technologies} around 1975 and made by Rockwell.
Unlike the Intel 8080 and its kind, the 6502 had very few
registers. It was an 8-bit processor, with 16-bit {address
bus}. Inside was one 8-bit data register (accumulator), two
8-bit index registers and an 8-bit stack pointer (stack
was preset from address 256 to 511). It used these index and
stack registers effectively, with more addressing modes,
including a fast zero-page mode that accessed memory locations
from address 0 to 255 with an 8-bit address (it didn't have to
fetch a second byte for the address).
Back when the 6502 was introduced, RAM was actually faster
than CPUs, so it made sense to optimise for RAM access
rather than increase the number of registers on a chip.
The 6502 was used in the BBC Microcomputer, Apple II,
Commodore, Apple Computer and Atari {personal
computers}. Steve Wozniak described it as the first chip
you could get for less than a hundred dollars (actually a
quarter of the 6800 price).
The 6502's indirect jump instruction, JMP (xxxx), was
broken. If the address was hexadecimal xxFF, the processor
would not access the address stored in xxFF and xxFF + 1, but
rather xxFF and xx00. The 6510 did not fix this bug, nor
was it fixed in any of the other NMOS versions of the 6502
such as the 8502. Bill Mensch at Western Design Center
was probably the first to fix it, in the 65C02.
The 6502 also had undocumented instructions.
The 65816 is an expanded version of the 6502.
There is a 6502 assembler by Doug Jones <jones@cs.uiowa.edu>
which supports macros and conditional features and can be
used for linkage editing of object files. It requires
Pascal.
See also cross-assembler, RTI, Small-C.
(2001-01-02)
Wikipedia
Rockwell scale
The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). There are different scales, denoted by a single letter, that use different loads or indenters. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale. Higher numbers correspond to harder materials.
When testing metals, indentation hardness correlates linearly with tensile strength.
