I don't have a working NetBSD system, and I need to comment out the
MRG_ADB option in the NetBSD-current/mac68k using the MacOS on a
PowerBook 170 8/500 (68030).

Tools available include CodeWarrior 10 Gold, Alpha, BBEdit 4.5 Demo,
Resedit, Stuffit, MacGzip, McZip, suntar, ZipIt, and ShrinkWrap. 

What other tools are need to read and change the NetBSD source code.

Disabling the MRG_ADB option, turns on both the Power Manager driver 
and the ADB interface (screen) which hopefully will give  the PowerBook
a working NetBSD system.

Any comment, thanks... -Emmett