www/notes/mos-6502.md

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---
title: MOS 6502 Microprocessor
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last_updated: '2022-09-29T02:41:26.738Z'
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---
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<table>
<tr>
<td>Name</td>
<td>6502</td>
</tr>
<tr>
<td>Introduced</td>
<td>1975</td>
</tr>
<tr>
<td>Data Width</td>
<td>8-bit</td>
</tr>
<tr>
<td>Address Width</td>
<td>16-bit</td>
</tr>
<tr>
<td>Endianness</td>
<td>Little</td>
</tr>
<tr>
<td>Registers</td>
<td>8-bit A, X, Y, Stack. 16-bit PC</td>
</tr>
<tr>
<td>Package</td>
<td>40-pin DIP</td>
</tr>
<tr>
<td>Instruction Count</td>
<td> 56</td>
</tr>
</table>
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## Addressing Modes
- Implied
- Immediate
- Absolute
- Indexed Absolute
- Indexed Zero-Page
- Relative
- Accumulator
- Indirect, X
- Indirect, Y
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## Docs
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- [westerndesigncenter.com: WDC W65C02S NMOS Variant](https://www.westerndesigncenter.com/wdc/documentation/w65c02s.pdf)
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- [6502.org: collection of 6502 resources](http://6502.org/)
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## Notable Usage (includes variants)
- Nintendo Entertainment System
- Atari 2600
- Apple II
- Commodore 64
- BBC Micro