I'm looking into writing a small, yet valuable, package called Sparrow that will allow users to run custom IM 1 routines without damaging the TI interrupt routine.  (No runer, this is not Project Crabcake )If the calculator crashes, the TI routine will run without any problems at all.

However, I do need to know, is there any OS section of flash (like a part of a page) that no Operating system on Ti-83+s or Ti-84+s has touched?

And I need to put a couple of lines of code in page 0, as well as that one spot in flash that I can write in.  What's the best way to write to OS pages?

There's room on the end of almost all the pages for code. The amount just varies by OS.

But I would say you are much better off just making an IM 2 interrupt that that ends with jp $0038. It has exactly the same benefits as IM 1 interrupts but it is OS version independent. The reason I say this is different OS's do different things down at $0038 and adding code there could be difficult.

The different things at $0038 makes a lot of sense, but I have that under control.  Considering that my goal with this is so programmers won't have to create a 257-byte jump table, can you tell me the best way to write to flash?  I have no idea if B_CALLs will work on OS pages or not.

This topic is now locked.

Why?