15 Jul
2001
15 Jul
'01
1:43 a.m.
>MicroBug was first introduced with the Mac Plus
and has been a standard
>component in the ROM of all Mac OS computers since then. MicroBug is
invoked
when the system
takes a Non-Maskable Interrupt (NMI) and there is no other
debugger (e.g., MacsBug) installed.
What debugger did the 128k have in it then? It shipped with
a small switch that pressed both a recessed reset switch and a
programmers switch. The switches were accessed through the side
ventilation slots.