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| spo600:6502 [2024/01/12 15:19] – created chris | spo600:6502 [2024/05/09 05:44] (current) – external edit 127.0.0.1 |
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| ====== 6502 ====== | {{ :spo600:mos_6502.jpg?250|}}====== 6502 ====== |
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| The MOS Technologies 6502 processor was introduced in the mid-1970s to fill the need for a affordable general-purpose CPU. Its low cost (US$25 at introduction, less than C$0.89 now) was less than one-sixth of competing CPUs, and it had very simple circuitry requirements which made it simple and inexpensive to incorporate it into products. The 6502 (or a slight variation) was therefore used in many home and personal computers, such as the Apple II; the Commodore PET, Vic-20, and C64; the Atari 400 and 800; the BBC Micro; and games such as the Nintendo Entertainment System (NES), Atari 5200, and Atari 6200. A number of variations of this processor have been produced, using different semiconductor processes, integrated peripherals, instruction and data-width extensions, and pinouts. Several different versions are still in production for various embedded applications, and it remains a popular chip for homebrew system builders. | The MOS Technologies 6502 processor was introduced in the mid-1970s to fill the need for a affordable general-purpose CPU. Its low cost (US$25 at introduction, less than C$0.89 now) was less than one-sixth of competing CPUs, and it had very simple circuitry requirements which made it simple and inexpensive to incorporate it into products. The 6502 (or a slight variation) was therefore used in many home and personal computers, such as the Apple II; the Commodore PET, Vic-20, and C64; the Atari 400 and 800; the BBC Micro; and games such as the Nintendo Entertainment System (NES), Atari 5200, and Atari 6200. A number of variations of this processor have been produced, using different semiconductor processes, integrated peripherals, instruction and data-width extensions, and pinouts. Several different versions are still in production for various embedded applications, and it remains a popular chip for homebrew system builders. |
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| A note on hexadecimal notatin: In most 6502 documentation, including this page, the ''$'' prefix indicates hexadecimal notation. On other systems, this may be designated by a ''0x'' prefix. Therefore, the value $30 indicates the hexadecimal value 30, which is equal to the decimal value 48 (or the ASCII code for a zero "0"). | A note on hexadecimal notation: In most 6502 documentation, including this page, the ''$'' prefix indicates hexadecimal notation. (On other systems, this may be designated by a ''0x'' prefix or an ''h'' suffix). Therefore, the value $30 indicates the hexadecimal value 30, which is equal to the decimal value 48 (or the ASCII code for a zero "0"). |
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| ===== Memory ===== | ===== Memory ===== |
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| ===== Resources ===== | ===== Resources ===== |
| * [[http://6502.cdot.systems|6502.cdot.systems]], the 6502 emulator we use in this course | |
| * [[https://en.wikipedia.org/wiki/MOS_Technology_6502|Wikipedia entry for 6502]] | * [[https://en.wikipedia.org/wiki/MOS_Technology_6502|Wikipedia entry for 6502]] |
| * [[http://6502.org/|6502.org]] | * [[http://6502.org/|6502.org]] |
