last summer I hacked into DDB via the USB keyboard 
via a callout from internal_command()\wscons/wskbd.c; 
the diff (below) is w/ some context in case the current 
sources have drifted from what I used (1.4Z).
the changes are marked #ifdef ALLEGRO.
  
Unfortunately, what you really want is a polling interface 
to the keyboard once you're in DDB; this hack does not address 
that issue, but does get you in.  Hope it helps.

	-cliff-



*** wskbd.c.00  Thu Mar 23 04:34:31 2000
--- wskbd.c     Thu Aug  3 19:57:43 2000
***************
*** 287,292 ****
--- 287,296 ----
  
  static void wskbd_update_layout __P((struct wskbd_internal *, kbd_t));
  
+ #if defined(ALLEGRO) && defined(DDB)
+ struct callout wskbd_console_debug_callout = { 0 };
+ #endif
+ 
  static void
  wskbd_update_layout(id, enc)
        struct wskbd_internal *id;
***************
*** 1304,1310 ****
--- 1308,1322 ----
  #ifdef DDB
        case KS_Cmd_Debugger:
                if (sc->sc_isconsole)
+ #if defined(ALLEGRO)
+               {
+                       callout_init(&wskbd_console_debug_callout);
+                       callout_reset(&wskbd_console_debug_callout, 1,
+                               (void(*))cpu_Debugger, 0);
+               }
+ #else
                        console_debugger();
+ #endif
                /* discard this key (ddb discarded command modifiers) */
                *type = WSCONS_EVENT_KEY_UP;
                return (1);



-----Original Message-----
From: Matt Thomas [mailto:matt@3am-software.com]
Sent: Thursday, February 22, 2001 4:53 PM
To: mjl@emsi.priv.at; port-macppc@netbsd.org
Subject: Re: Booting, Debugging

>   How do I get into DDB? The "programmer's button" doesn't
>seem to have any effect. (I have here a hard hang after accessing
>a USB-scanner so I wanted DDB to find out where it hangs)

bad news, running DDB on mac with a USB keyboard doesn't seem
to work.