TSRs TSRs are Terminate and Stay Resident programs. If you change the RET and exchange instructions in your interrupt to JP $003A, then you'll process the calculator's system interrupt as well as your own.
Whoa, whoa, wait a minute. Why are we jumping to $003A? Isn't the system routine at $0038??
Well, yes, the Mode 1 interrupt does jump to $0038. What we are doing is swapping the shadow registers when our interrupt is run, and we want them to stay swapped when the system interrupt is running. A section of the code at $0038 looks like
0038: JR $006A 003A: IN A, (4) . . 006A: EX AF, AF' 006B: EXX 006C: JR $003A
Yes this is completely redundant, but by jumping to $003A the exchanges get skipped over.
This is useful if you still want GetKey and GetCSC and other Mode 1 features to work while you're in Mode 2.
No, the way flash works is that all the data has to be cleared at the same time, or at least in very large chunks. After that, the entire page is 1s in binary. From then on, you can only write 0's over the 1's and you wouldn't be able to write a 1 over a 0 since the memory is kind of "one way". Think about it like the voltage potential is put high and it is easy to put it low (by writing a 0) but it can't be put high again unless the entire chip is put high.
Here's the finished version. I'll probably write a readme later, but all you really need to know is this: prgmA is the source. prgmAXESNAKE is compiled for Ion using 0.3.2. It creates the AppVar AxeSnake to save your high scores. If you've archived the AppVar, it will put it back in archive.
This is just like snake, only it's made in Axe with 3 level greyscale. Enjoy!
Oh, and I recorded it at a pretty low framerate, so that's why it doesn't look as well as it does on calc.
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