Re: A86: Many Stupid Questions


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Re: A86: Many Stupid Questions




> 1.    If you run a program that turns the calc off, does the program
> continue where it left off when the calc is turned on again?

Yes, it's either a ROM call or a simple set of commands in your
program.  When the calculator is turned back on, the ROM call
RETs (if you used it) and your program continues where it left off.

> 2.    What are shadow registers for?

The shadow registers are "backup" registers used for storing the
data in the registers when an interrupt is called.  This way, the
interrupts do not mess the program up.

> 3.    Is it possible to adjust the contrast of individual pixels, or do
> you have to adjust the contrast of the whole screen?

No, the contrast is a hardware method of managing the amount
of power going to the screen.  It is not possible to differentiate
between pixels, using hardware or software.  If you want gray
pixels, you have to use a grayscale routine (which works by
flipping the pixels on and off a few dozen (or 200) times a second).


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