Intel Apple using Intel to manufacture some of its processors appears to have gone from rumor to reality at light speed. Following news earlier this month that the two companies were in discussions , supply chain export Ming-Chi Kuo now says that Apple has kicked off test runs for systems-on-chip built on Intel's 18A-P process. The idea is to build "low-end/legacy iPhone, iPad, and Mac processors," according to Kuo's post on X .  Intel, of course, used to be Apple's only supplier of Mac processors until 2020 when the company switched to its own M Silicon chips built primarily by Taiwan's TSMC. Earlier this month it was reported that Apple wasn't comfortable relying so heavily on TSMC for its processors and wished to diversify.…