"Working together, the AIM alliance developed a single-chip, POWER-based processor dubbed the PowerPC. In addition, they also developed two reference platforms for the new processor: the first was dubbed PReP (PowerPC reference platform), and its follow-on was CHRP (pronounced "chirp", common hardware reference platform), which incorporated Open Firmware. The "common" in CHRP's name referred to the fact that the platform was intended to run a variety of operating systems on its PowerPC processor, including the Mac operating system, Microsoft Windows NT,"
"You might be forgiven if you don't recognize the abbreviation CHRP in 2025. Along with its sibling PReP, these days it is one only a few old-time RISC workstation enthusiasts might instantly remember. The PowerPC chips on which Apple based its Mac computers from 1994 to 2006 were based on a design from IBM's high-end POWER machines, once RS/6000, later System p, and now sold as IBM Power."
Hand-labelled CD-R media containing Mac OS 7.6 and 8.0 built for CHRP PowerPC hardware has been found. CHRP (Common Hardware Reference Platform) and its predecessor PReP were AIM Alliance reference platforms for PowerPC systems. The PowerPC architecture derived from IBM's POWER line used in RS/6000 and System p machines. CHRP included Open Firmware and aimed to support multiple operating systems including Mac OS, Windows NT, OS/2, Solaris, and AIX. CHRP failed to gain market traction, though IBM employed it in some RS/6000 systems. The recovered media enables running classic Mac OS on rare CHRP and other PowerPC machines.
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