While I don use either one, the consensus seems to be that MpegDec is greatly superior to mpg-123 as far as features go, although both are supposedly equally adept at playing MP3s. Back to FAQ Index 1.5.5 – Whats that rectangular screen that comes up sometimes that makes me have to restart?
That’s the screen of the built-in debugger. It can be accessed by pressing the programmer’s – or interrupt – switch (command-power on later Macs or the switch with the solid round icon on Macs with the switch). The switch generates a non-maskable interrupt that immediately forces the computer into either the built-in debugger or Macsbug (if you have it installed). To get out of this box without restarting (assuming you accidentally dropped into the debugger, as opposed to crashing into it), type G and press return. If you got to the debugger by crashing, try typing G and return anyway, but it probably won’t work. There are a few neat easter eggs on certain Macs that can be accessed by giving an address in memory after the G, but that’s another topic.
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