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sexta-feira, 11 de julho de 2014

6502

 
 
 
Origem: Wikipédia, a enciclopédia livre.
 
Um processador MOS 6502 em seu invólucro plástico DIP de 40 pinos.
O MOS Technology 6502 é um microprocessador de 8 bits projetado por Chuck Peddle para a MOS Technology em 1975. Quando foi apresentado, era a UCP completa mais barata do mercado, custando cerca de 1/6 (ou menos) do preço de dispositivos similares feitos por grandes empresas concorrentes, como Motorola e Intel. Era ainda mais rápido do que a maioria deles, e, juntamente com o Zilog Z80, deu origem a uma série de projetos de computadores que eventualmente resultaram na revolução dos computadores domésticos dos anos 1980. A fabricação do 6502 foi também suprida originalmente pela Rockwell e Synertek, e posteriormente licenciada para várias outras empresas; ele ainda é produzido para uso em sistemas embarcados.

Trívia do 6502

  • Mesmo nos dias de hoje, mais de 3 décadas depois da introdução do 6502, algumas universidades, incluindo a Universidade da Tasmânia, a University of Applied Sciences de Colónia, Alemanha e a Hull University ainda usam este processador para ensinar linguagem Assembly e arquitetura de computadores.

Referências

Ligações externas

6502

at 15:25  |  Sem comentários

6502

 
 
 
Origem: Wikipédia, a enciclopédia livre.
 
Um processador MOS 6502 em seu invólucro plástico DIP de 40 pinos.
O MOS Technology 6502 é um microprocessador de 8 bits projetado por Chuck Peddle para a MOS Technology em 1975. Quando foi apresentado, era a UCP completa mais barata do mercado, custando cerca de 1/6 (ou menos) do preço de dispositivos similares feitos por grandes empresas concorrentes, como Motorola e Intel. Era ainda mais rápido do que a maioria deles, e, juntamente com o Zilog Z80, deu origem a uma série de projetos de computadores que eventualmente resultaram na revolução dos computadores domésticos dos anos 1980. A fabricação do 6502 foi também suprida originalmente pela Rockwell e Synertek, e posteriormente licenciada para várias outras empresas; ele ainda é produzido para uso em sistemas embarcados.

Trívia do 6502

  • Mesmo nos dias de hoje, mais de 3 décadas depois da introdução do 6502, algumas universidades, incluindo a Universidade da Tasmânia, a University of Applied Sciences de Colónia, Alemanha e a Hull University ainda usam este processador para ensinar linguagem Assembly e arquitetura de computadores.

Referências

Ligações externas

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, , Postado por: Osvaldo

MOS Technology 6507

From Wikipedia, the free encyclopedia
UMC UM6507 (= MOS 6507).
The 6507 is an 8-bit microprocessor from MOS Technology, Inc.
It is essentially a 6502 chip in a smaller, cheaper 28-pin package. To do this, A15 to A13 and some other signals such as the interrupt lines are not accessible. As a result, it can only address 8 KB of memory, which at the time (1975) was not considered restrictive.
The Atari 2600
The 6507 and 6502 chips use the same underlying silicon layers, and differ only in the final metallisation layer. This ties the interrupt lines to their inactive level so that they are not vulnerable to generating spurious interrupts from stray noise. The first three digits of the chip identifier are part of the silicon layers, and the final digit is in the metallisation layer. Micro-photography of the 6502 and 6507 shows this difference.[1]
The 6507 was only widely used in two applications, the best-selling Atari 2600 video game console and the Atari 8-bit family floppy disk controllers for the 810 and 1050 drives. In the 2600, the system was further limited by the design of the ROM cartridge slot, which allowed for only 4KB of external memory to be addressed (the other 4KB was reserved for the internal RAM and I/O chip).
Most other machines, notably home computers based on the 650x architecture, used either the standard 6502 or extended, rather than cut down, versions of it, in order to allow for more memory.
By the time the 6502 line was becoming widely used around 1980, ROM and RAM semiconductor memory prices had fallen to the point where the 6507 was no longer a worthwhile simplification; its use in new designs ceased at that point, though the Atari 2600 that contained it continued to be sold into the early 1990s, as it wasn't discontinued until January 1, 1992.

Pin configuration

Pin Layout of MOS 6507[2]
/RES 1 28 Ph2 out
Vss 2 27 Ph0 in
RDY 3 26 R/W
Vcc 4 25 D0
A0 5 24 D1
A1 6 23 D2
A2 7 22 D3
A3 8 21 D4
A4 9 20 D5
A5 10 19 D6
A6 11 18 D7
A7 12 17 A12
A8 13 16 A11
A9 14 15 A10
The 6507 uses a 28-pin configuration, with 13 pins in use for addressing, and 8 for data. The seven remaining pins are used for power, clock cycles, to indicate reset or ready, and control the read/write request from the CPU. There is no IRQ or NMI on the processor.

References

  1. Visual6502. "Visual6502.org: 6502 vs. 6507".
  2. Peter Turnbull (January 25, 2005). "MOS 6507 Tech Spec's".[dead link]

MOS Technology 6507

at 14:54  |  Sem comentários

MOS Technology 6507

From Wikipedia, the free encyclopedia
UMC UM6507 (= MOS 6507).
The 6507 is an 8-bit microprocessor from MOS Technology, Inc.
It is essentially a 6502 chip in a smaller, cheaper 28-pin package. To do this, A15 to A13 and some other signals such as the interrupt lines are not accessible. As a result, it can only address 8 KB of memory, which at the time (1975) was not considered restrictive.
The Atari 2600
The 6507 and 6502 chips use the same underlying silicon layers, and differ only in the final metallisation layer. This ties the interrupt lines to their inactive level so that they are not vulnerable to generating spurious interrupts from stray noise. The first three digits of the chip identifier are part of the silicon layers, and the final digit is in the metallisation layer. Micro-photography of the 6502 and 6507 shows this difference.[1]
The 6507 was only widely used in two applications, the best-selling Atari 2600 video game console and the Atari 8-bit family floppy disk controllers for the 810 and 1050 drives. In the 2600, the system was further limited by the design of the ROM cartridge slot, which allowed for only 4KB of external memory to be addressed (the other 4KB was reserved for the internal RAM and I/O chip).
Most other machines, notably home computers based on the 650x architecture, used either the standard 6502 or extended, rather than cut down, versions of it, in order to allow for more memory.
By the time the 6502 line was becoming widely used around 1980, ROM and RAM semiconductor memory prices had fallen to the point where the 6507 was no longer a worthwhile simplification; its use in new designs ceased at that point, though the Atari 2600 that contained it continued to be sold into the early 1990s, as it wasn't discontinued until January 1, 1992.

Pin configuration

Pin Layout of MOS 6507[2]
/RES 1 28 Ph2 out
Vss 2 27 Ph0 in
RDY 3 26 R/W
Vcc 4 25 D0
A0 5 24 D1
A1 6 23 D2
A2 7 22 D3
A3 8 21 D4
A4 9 20 D5
A5 10 19 D6
A6 11 18 D7
A7 12 17 A12
A8 13 16 A11
A9 14 15 A10
The 6507 uses a 28-pin configuration, with 13 pins in use for addressing, and 8 for data. The seven remaining pins are used for power, clock cycles, to indicate reset or ready, and control the read/write request from the CPU. There is no IRQ or NMI on the processor.

References

  1. Visual6502. "Visual6502.org: 6502 vs. 6507".
  2. Peter Turnbull (January 25, 2005). "MOS 6507 Tech Spec's".[dead link]

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, , Postado por: Osvaldo
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