14 Jul
2001
14 Jul
'01
2:47 a.m.
the early macs
at least also have a built in ROM-Monitor :)
probably the later ones too, although I think that they stopped
including in the powermac series.
My B/W G3 still has the programmer's switch on the front
panel and I believe that the G4's we have at work still do as well.
I don't recall if the iMac's do or not. When pressed, it still drops
you to the '>' prompt but none of the manuals that ship with the
machines tell you anything about it. I've never been able to exit
back out of it without rebooting, nor have I actually gotten it to
show any of the info one generally does from a monitor program.
Jeff 
14 Jul
14 Jul
5:38 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.
Jeff
--
Collector of Classic Microcomputers and Video Game Systems:
Home of the TRS-80 Model 2000 FAQ File
http://www.geocities.com/siliconvalley/lakes/6757
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