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| | Apple II History Museum - Articles |
 | | Their first chip, the 6501, was too similar to the Motorola 6800 (although it required some additional support chips to work the same as the 6800, it was pin-compatible, used a few similar op-codes, etc), and Motorola sued to prevent them from selling it. |
 | | The 6501 was pin-compatible with the 6800, whereas the 6502 added the innovation of an on-chip clock generator, which eliminated the need for the two-phase clock input but gave the chip a different pinout. |
 | | Motorola promptly sued MOS Technology, and an out-of-court settlement was reached in which MOS Technology agreed to take the 6501 off the market but was free to sell the 6502. |
| www.apple2history.org /museum/articles/microreport/microreport.html (1149 words) |
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