Evaluation time: 25+ days (Jan. 24, 2007 to the present (Feb. 18, 2007))
Tested on: HW2 TI-89 with AMS 2.09
* Stability/Reliability: 10/10
* Features: N/A
* Size/Efficiency: 9/10
* Ease of use/Usability: 10/10
* Documentation: 9/10
* Overall: 10/10
h220xtsr is a must for installing TSRs on HW2 calculators when HW2Patch or HW3Patch is not present. (TSRs are generally used to modify the behavior of AMS in a useful way or to make a function readily accessible almost anywhere with a key combination.) h220xtsr eliminates the execution protection "feature" that can cause crashes when TSRs are installed without it. This is h220xtsr's only purpose, and it serves it well. Before installing other TSRs, it is sent to the calculator, run, and it's installed. It can't get much easier than that. When I first tried TSRs, I kept getting random crashes in AMS and BASIC programs. h220xtsr fixed all of these. What can I say? This gets a perfect overall score of 10/10.
I recommend h220xtsr if you want to use TSRs on a HW2 calculator but would rather not modify the AMS with HW2Patch or HW3Patch. However, HW3 and HW4 calculators (i.e. the TI-89 Titanium) must be patched with HW3Patch instead of using h220xtsr.