Macintosh firmware

technical standard

set of application programming interfaces with a particular access mechanism

Macintosh models that do not use a Macintosh Toolbox ROM on the logic board

Macintosh models that use a Macintosh Toolbox read-only memory chip

rEFInd is a boot manager for UEFI and EFI-based machines. It can be used to boot multiple operating systems that are installed on a single non-volatile device. It also provides a way to launch UEFI applications.