“Upward compatible” in Japanese
Short answer
Upward compatible in Japanese is “下位互換” (kaigokan). Full meaning: upward compatible, forward compatible; downward compatible, backward compatible; providing the same function while being less effective (esp. in games).
Other ways to say “Upward compatible” in Japanese
前方互換
zenpougokan forward compatible, upward compatible
アップワードコンパチブル
appuwaadokonpachiburu upward compatibility, upward compatible
上位互換
jouigokan downward compatible, backward compatible; upward compatible, forward compatible; providing the same function while being more effective (esp. in games)
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