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Quote from: Compynerd255 on March 25, 2011, 07:01:24 pmHow does the calculator even detect that code is running in the "illegal" area? The only explanation that I can think of is that the last two bits on the address bus (the ones that must be on if code above C000 is being executed) are wired into a trigger that causes the processor to jump to the boot code. In other words, the detection is in the hardware itself.Most likely it is. Remember that we are talking about all of this being in the processor. So the processor knows immediately if the pc is C000h or above.
How does the calculator even detect that code is running in the "illegal" area? The only explanation that I can think of is that the last two bits on the address bus (the ones that must be on if code above C000 is being executed) are wired into a trigger that causes the processor to jump to the boot code. In other words, the detection is in the hardware itself.
Quote from: mikehill2003 on March 24, 2011, 09:10:36 pmAhh. Oops. But now I'm curious, what DOES happen? RAM clear? Calc turns off? Do you just remove the batteries for 15 minutes?You usually don't have to keep batteries out, that's only for rare cases.
Ahh. Oops. But now I'm curious, what DOES happen? RAM clear? Calc turns off? Do you just remove the batteries for 15 minutes?
