I am considering attempting to write a program that would run on either ti-83+ or latter or ti-84+ or latter. I have decided that it would be best to write a flash application. I know how to program already and have written some programs in assembly for different cpus before I just want to know the header needed to do such. I do not want to require anything to be installed on the calculator such as a shell. If I understand correct. I need to assemble my program using an assembler such as z80asm then use rabbitsign on the final binary then I can get it into the emulator and then I should just be able to run the program. Are there any tutorials on getting starting for a flash application. All the ones I see use TASM which is obsolete and is shareware and they are for a particular shell and I want to avoid the requirement of a shell.

Header for Brass:


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Build script for Windows:

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Header for Spasm:

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Build script:

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Thank you I will try it out. Also about the datestamp why not put program data there if nothing checks it?

You could. Or you could leave the field completely empty, which is what you see in the header samples I gave.

Alright I will go with the later. A more flexible way to reduce memory although that will most likely not be a concern for me as programs must be aligned by 16kb. Could

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Also be removed?
Where can I find documentation on this header?
I end of with these two errors with the simple act of trying to assemble what you have posted using SPASM

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Edit: I googled part of the header and found http://wikiti.brandonw.net/index.php?title=83Plus:OS:Certificate/Headers:Fields:Application_Headers it turns out that field is not needed.
Edit2: Got the program up and running but garabge is displayed on screen.

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You can't just _PutS in apps, since your string is in bank 1 which gets swapped out during romcalls. TI's recommended way is to copy strings to RAM then call _PutS, but that's rather silly. I prefer to just implement PutS on-page so no copy is required:
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Invocation is trivial:
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Thank you. It works perfect. I'll do more reading into memory mapping to avoid further issues like this.
Edit: It appears as though if I put the lenght of the string as the first byte I can make a faster function

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This was based on http://www.z80.info/z80time.txt
Did I do my math correctly?