To type directly with the computer keyboard:

• Type a consonant to get ə (by default)
• Type e for ä and ee (or é) for ē
• Type aa for ʷa
• Type a capital letter H, T, C, P, S for ḥ   ṭ   č̣   p̣   ṣ
• Type ss (or sh), c (or tt), zz (or zh), j (or dd) for š   č   ž   ǧ
• Type a capital letter N (or n=) for ñ
• Type a capital letter X (or h=) for ḫ
• Type sz, tz (or s=, S=) for ś   ṣ́
• Type < or the apostrophe ['] for the glottals or the lower case vowels
• Type > or the quotation marks ["] for the pharyngals or the capital vowels

Download & install the font Noto Sans Ethiopic