I'll help create an assembly version that should provide a more accurate measurement since we can work closer to the hardware level.



This assembly version will give you a more accurate measurement of the CPU speed because:

1. It uses direct hardware access to the timer
2. We can precisely control the number of cycles being measured (using nop instructions)
3. It eliminates the overhead from BASIC interpretation

To use this program:

1. You'll need an assembler that can compile for the TI-89's MC68000 processor (like TASM)
2. Save it with a .asm extension
3. Compile it to create a .89z file
4. Transfer it to your calculator using TI-LINK or a similar program

Some technical notes:
- The TI-89 uses a Motorola 68000 processor
- The timer runs at 32768Hz (crystal oscillator frequency)
- We're using NOPs as they are predictable single-cycle operations
- The actual CPU clock speed of a TI-89 is around 16MHz, so you can verify if your measurements are reasonable

Important safety notes:
1. Be careful when running assembly code as it has direct hardware access
2. Make sure to save all your calculator data before testing
3. If the program freezes, you may need to reset your calculator

Would you like me to explain any specific part of the assembly code or help you modify it for different measurements?