New World ROMs are 1 MB stubs containing OpenFirmware and some basic drivers, but has an additional ROM stored on the Mac's hard disk to provide Toolbox functionality. The ROMs stored on the Mac's hard disk also had updates distributed.
Within Apple, the project to overhaul Mac OS ROM code from separate portable, low-end, and high-end branches into a single codebase was called SuperMario.
For serial, it replicates the functionality of a Zilog ESCC. There are two different ports - one located at (MacIOBase) + 0x13000 for the printer, and the other at (MacIOBase) + 0x13020 for the modem.
On a physical machine, one has to hold the Command/Apple, Option, P and R keys together. However, using DingusPPC, one can simply delete the nvram.bin file instead.
Support is only present in New World Macs, despite the presence of strings in the Power Mac G3 Beige ROM. Most Macs support 1.1, with 2.0 support present in G5 Macs. Both it and Firewire follow the Open Host Controller Interface (OHCI) standard.
* In order for the mouse to move, it generally needs to use the Vertical Blanking Interrupt (VBL) present on the video controller. However, the Pippin instead uses a virtual timer task to accomplish this, as there is a bug that prevents the VBL from working in the Taos graphics controller.
* The Power Mac G3 Beige has an additional register at 0xFF000004, which is dubbed varyingly as the "cpu-id" (by Open Firmware), the ""systemReg" (display driver) or "MachineID" (platform driver).
