As many know, I am an assembly programmer and I come up with a bunch of hexadecimal opcodes all the time. But there are over 60 codes on that page! If you want to combine a few codes all into one program, there are many ways to do that (nCr), but I will show you BASIC programmers a few ways to do it yourself.
First, figure out which commands you want to include. Some of the commands will not work with this method:
- Sprite
- Fast Keys
- Repeat Keys
These will not work only because they use some constant addresses for routines (basically, it expects a routine to be in a specific place in RAM, so you would need to recalculate the addresses which requires some assembly knowledge).
Step one: You have your commands.
Step two: Arrange them in some order. We will access them using a number in Ans starting at zero
Step three: Choose your starting code:
If any of your routines require an input in Ans as a number:
1817 ;skips the first chunk of code
ED5BAF84
7AB3C8
1BED53AF84
2AB184E7
22B184
EFEF4AC9
EFD74A3DC0
EB4E234623
ED43AF84
22B184
CD979DIf any of the routines require Ans as a string, we will need to use Str1 instead
1810
EFC541
21AA00
227984
D7
EB4E234623C9
EFD74A
EFEF4AIf any routines require Ans as a number and any routines require Ans as a string:
1827 ;skips the first chunk of code
ED5BAF84
7AB3C8
1BED53AF84
2AB184E7
22B184
EFEF4AC9
EFC541
21AA00
227984
D7
EB4E234623C9
EFD74A3DC0
EB4E234623
ED43AF84
22B184
CD979DIf Ans is not an input for any of your routines:
EFD74AEFEF4AStep 4: Replace code. This might be tough in some cases:
Case 1: Ans is not an input for any routines.
No replacing is needed! Go to Step 5.
Case 2: Ans is a number for some inputs and is never a string
Replace all instances of EFD74AEFEF4A with CD979D
Replace all instances of EFDA4AEFEF4A with CD979D
Replace all instances of EFE04AEFEF4A with CD979D
Case 3: Ans is a string for some inputs and is never a number
Replace all instances of EFD74AFE04C0EB4E234623 with CD979D
Replace all instances of EFD74AD604C0EB4E234623 with CD979D
Case 4: Ans is a number in some commands, and could be a string for some commands:
Replace all instances of EFD74AEFEF4A with CD979D
Replace all instances of EFDA4AEFEF4A with CD979D
Replace all instances of EFE04AEFEF4A with CD979D
Replace all instances of EFD74AFE04C0EB4E234623 with CDAE9D
Replace all instances of EFD74AD604C0EB4E234623 with CDAE9D
Step 5: Now we add the codes in! you have your starting code, now you will need to do some byte counting. This is mildly tedious, but not difficult.
4704
10**
<<code0>>
10**
<<code1>>
10**
<<code2>>
10**
<<code3>>
10**
<<code4>>
...
05C0
<<last code>>The ** means you need to count how many bytes are in the routine following. Every two hex digits makes one byte. Every full line in the TI-BASIC editor is 8 bytes since it is 16 chars wide.
So for example, 3E02D310C9 is 5 bytes. Be careful, this value must be in hexadecimal!
Now for my own example. I will use
ScreenOn : 3E03D310C9
ScreenOff : 3E02D310C9
ScreenToggle : DB10CB6F3E0220013CD310C9
QuickKey : 3A3F84EF8C47EFBF4AC9
LowerCase On : FDCB24DEC9
Lowercase Off : FDCB249EC9
Indicator Off : EF7045C9
Set Contrast : EFD74AEFEF4AC6D8D8D3107B324784C9
Since Set Contrast uses Ans as an input and none of the other routines need Ans as a string, I will use the first starting code:
1817 ;skips the first chunk of code
ED5BAF84
7AB3C8
1BED53AF84
2AB184E7
22B184
EFEF4AC9
EFD74A3DC0
EB4E234623
ED43AF84
22B184
CD979DI will need to modify the code for Set Contrast:
EFD74AEFEF4AC6D8D8D3107B324784C9 turns into:
CD979DC6D8D8D3107B324784C9
And now I need to add this:
4704
1005
3E03D310C9
1005
3E02D310C9
100C ;0C is hexadecimal for 12
DB10CB6F3E0220013CD310C9
100A ;0A is hexadecimal for 10
3A3F84EF8C47EFBF4AC9
1005
FDCB24DEC9
1005
FDCB249EC9
1004
EF7045C9
05C0
CD979DC6D8D8D3107B324784C9So now here is how to use your program:
- If your program has any commands that use Ans as a string input, the string must be in Str1 instead
- If your program has any commands that use Ans as a number input (or X or Y), the inputs are now passed as list elements.
- If Ans is not needed as a number input by any of the routines, you will simply pass a number to your program
So for example, my program takes a list input. The first element is the command number (I have 8 commands, so use 0 to 7) and the second argument is for any additional inputs the routine may need.
So SetContrast would be {7,«contrast»:Asm(prgmLIB
If you omit an argument, the program will read it as 0. So {7} passed to my program will set the contrast to zero.
Maybe next I will explain combining opcodes? For example, EF7045210000115F3FEF5F4DC9 to turn off the runindicator and invert the screen?
Or maybe I will explain DIY rectangle routines which will allow you to quickly draw a rectangular region on the screen inverted, filled, white, or with a border of some kind?
Ideas, questions, thoughts?
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