Which Macs are suffering from shortages—and where are things getting worse?

The Apple Macintosh is more than 40 years old, but it's still going strong, and its recent success was significant enough that Apple CEO Tim Cook called it out during the company’s earnings call last week . In particular, Cook credited the new low-cost MacBook Neo, which Apple says is attracting a fair number of new Mac buyers rather than simply prompting upgrades from previous customers. But Cook also noted that the Mac’s success was being held back somewhat by “supply constraints… on several M