Editing Macintosh Old World ROM (section)

== Hardware Identification ==

=== Distinguishing Features ===
Key characteristics that identify Old World ROM systems:

'''Physical Indicators:'''
* '''No built-in USB ports''': The definitive identifier (except PowerBook G3 Lombard)
* '''ADB ports''': Apple Desktop Bus for keyboard/mouse
* '''Serial ports''': RS-232/422 for printers and modems
* '''SCSI ports''': Either DB-25 or HDI-30 connectors
* '''Beige or platinum cases''': Pre-translucent design era

'''Technical Indicators:'''
* '''Boot chime timing''': Immediate on power-on (New World has delay)
* '''Maximum Mac OS version''': Generally limited to Mac OS 9.1 or earlier
* '''Mac OS X support''': Only Beige G3 and PowerBook G3 Wallstreet officially supported

=== Model Categories ===

'''68000 Family (1984-1994):'''
* Compact Macs: 128K through Classic II
* Modular Macs: Mac II family, Quadra series
* PowerBooks: 100 series through 500 series
* All boot directly to Toolbox

'''NuBus Power Macintosh (1994-1995):'''
* Power Macintosh 6100, 7100, 8100
* No Open Firmware present
* Direct Toolbox boot only

'''PCI Power Macintosh (1995-1998):'''
* Power Macintosh 7200, 7500, 7600, 8500, 9500, 9600
* Beige Power Macintosh G3
* PowerBook G3 Series (Wallstreet/PDQ)
* Limited Open Firmware 1.0.5-2.4