www/notes/mos-6502.md

# MOS 6502 Microprocessor
<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>


## Addressing Modes
- Implied
- Immediate
- Absolute
- Indexed Absolute
- Indexed Zero-Page
- Relative
- Accumulator
- Indirect, X
- Indirect, Y

## Docs
- [westerndesigncenter.com: WDC W65C02S NMOS Variant](https://www.westerndesigncenter.com/wdc/documentation/w65c02s.pdf)
- [6502.org: collection of 6502 resources](http://6502.org/)

## Notable Usage (includes variants)
- Nintendo Entertainment System
- Atari 2600
- Apple II
- Commodore 64
- BBC Micro