MOS Technology 6502: Difference between revisions
Jump to navigation
Jump to search
(Created page with "250px|right|6502AD (click to enlarge) The '''MOS 6502''' is an 8-bit processor that was originally developed by a team led by the engineer Chuck Peddle...") |
No edit summary |
||
| Line 15: | Line 15: | ||
Depending on the manufacturer the fabrication process can be CMOS, HMOS and NMOS. | Depending on the manufacturer the fabrication process can be CMOS, HMOS and NMOS. | ||
{| class="infobox" style="font-size:88%" | |||
|- | |||
|style="text-align:center" |''MOS 6502 registers'' | |||
|- | |||
| | |||
{| style="font-size:88%;" | |||
|- | |||
| style="width:10px; text-align:center;"| <sup>1</sup><sub>5</sub> | |||
| style="width:10px; text-align:center;"| <sup>1</sup><sub>4</sub> | |||
| style="width:10px; text-align:center;"| <sup>1</sup><sub>3</sub> | |||
| style="width:10px; text-align:center;"| <sup>1</sup><sub>2</sub> | |||
| style="width:10px; text-align:center;"| <sup>1</sup><sub>1</sub> | |||
| style="width:10px; text-align:center;"| <sup>1</sup><sub>0</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>9</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>8</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>7</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>6</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>5</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>4</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>3</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>2</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>1</sub> | |||
| style="width:10px; text-align:center;"| <sup>0</sup><sub>0</sub> | |||
| style="width:auto;" | ''(bit position)'' | |||
|- | |||
|colspan="17" | '''Main registers''' | |||
|- style="background:silver;color:black" | |||
| style="text-align:center; background:white" colspan="8"| | |||
| style="text-align:center;" colspan="8"| A | |||
| style="width:auto; background:white; color:black;"| '''A'''ccumulator | |||
|- | |||
|colspan="17" | '''Index registers''' | |||
|- style="background:silver;color:black" | |||
| style="text-align:center; background:white" colspan="8"| | |||
| style="text-align:center;" colspan="8"| X | |||
| style="background:white; color:black;"| '''X''' index | |||
|- style="background:silver;color:black" | |||
| style="text-align:center; background:white" colspan="8"| | |||
| style="text-align:center;" colspan="8"| Y | |||
| style="background:white; color:black;"| '''Y''' index | |||
|- style="background:silver;color:black" | |||
| style="text-align:center; background:#DDDDDD" colspan="8"| 0 0 0 0 0 0 0 1 | |||
| style="text-align:center;" colspan="8"| SP | |||
| style="background:white; color:black;"| '''S'''tack '''P'''ointer | |||
|- | |||
|colspan="17" | '''Program counter''' | |||
|- style="background:silver;color:black" | |||
| style="text-align:center;" colspan="16"| PC | |||
| style="background:white; color:black;"| '''P'''rogram '''C'''ounter | |||
|- | |||
|colspan="17" | '''Status register''' | |||
|- style="background:silver;color:black" | |||
| style="text-align:center; background:white" colspan="8" | | |||
| style="text-align:center;"| N | |||
| style="text-align:center;"| V | |||
| style="text-align:center;"| - | |||
| style="text-align:center;"| B | |||
| style="text-align:center;"| D | |||
| style="text-align:center;"| I | |||
| style="text-align:center;"| Z | |||
| style="text-align:center;"| C | |||
| style="background:white; color:black" | '''P''' Processor flags | |||
|} | |||
|} | |||
==Used in== | ==Used in== | ||
| Line 24: | Line 88: | ||
* [http://www.6502.org 6502 information site including datasheets and other derivative processors] | * [http://www.6502.org 6502 information site including datasheets and other derivative processors] | ||
==Pictures == | |||
<gallery> | |||
6502diagram.JPG | |||
</gallery> | |||
[[Category:Integrated circuits]] | [[Category:Integrated circuits]] | ||
Revision as of 16:56, 4 February 2019
The MOS 6502 is an 8-bit processor that was originally developed by a team led by the engineer Chuck Peddle. It was introduced in 1975 and it is still being produced. It was produced by the following companies.
- California Micro Devices (GTE Microcircuits)
- Commodore Semiconductor Group (MOS Technology)
- Rockwell
- Synertek
- Western Design Center
Currently it is only produced by Western Design Center (WDC)
It was a popular choice of processor because of it's low price and high capabilities. It was used in multiple early computers such as the Commodore 64, Commodore VIC-20, Apple II, BBC micro, and many others.
Internals
The 6502 had many revisions and derivatives. Most of the revisions have either enhanced it's capabilities or have added new features.
Depending on the manufacturer the fabrication process can be CMOS, HMOS and NMOS.
| MOS 6502 registers | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Used in
Documents
- WDC 65C02 datasheet (Offsite)
- 6502 information site including datasheets and other derivative processors
