Long ago I wrote my own really incomplete vi subset for the C64 that I really should dust off. But there's a more polished vi clone for 6502 machines, including the C64, Apple II and Atari: https://vi65.sourceforge.net/
I've got a TurboExpress. Recapped, it's a great little handheld. Screen is adequate for the era (though I've seen upgrades). My favourite 6502-based handheld is still the Atari Lynx, but this is close.
I've actually found them pretty terrible. I can't hear subtle findings at all with those. My usual stethoscope is an older-model Littman Cardiology III with stiff rubber and a dual pediatric-adult head. I've had it for over 25 years.
I guess it's different strokes, because I can definitely hear subtle sounds much easier with them. In fact normal sounds sound like it is going to blow out my ears. The only issue I have is consistency; it's difficult to gauge how much something has changed over time with different stethoscopes, especially pulmonary edema and wheezing.
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