Page "MOS Technology" Paragraph 6

When the 6501 was announced, Motorola launched a lawsuit almost immediately.

Although the 6501 was not compatible with the 6800, it could nevertheless be plugged into existing motherboard designs because it used the same arrangement of pins.

That was enough to allow Motorola to sue.

Sales of the 6501 basically stopped, and the lawsuit would drag on for many years before MOS was eventually forced to pay $ 200, 000 USD in fines.