from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun Acronym of
Extended Speech Assessment Methods Phonetic Alphabet, a SAMPA-inspired transcription of the IPAinto ASCII.
Sorry, no etymologies found.
I also goofed in X-SAMPA transcription, due to lack of practice.
Though there is an informal notation called ASCII IPA, I was actually thinking of X-SAMPA, which is a more recognized standard.
Given this, I also wonder if this means that *h1 was [x] and *h2 was [X] X-SAMPA for a voiceless uvular fricative.
The vowels would meet somewhere around  in X-SAMPA notation, which could then lower to [@] and still be distinct from [a].