I was doing some searches in Japanese about the Tennokoe Bank when I stumbled into this. Googling "Tennokoe Bank code" in English doesn't yield any results. Could it be that the English speaking world doesn't know about it?
EDIT: Be sure to read the rest of the thread before trying the code. The way it's described varies according to different sources. The first one here is probably wrong.
BANK4が未使用の状態で、RUN+SELECT+ I + II を押しながら電源投入後、タイトル画面で、左を押しながら I を4回、下を押しながら I を6回、右を押しながら I を2回、上を押しながら I を2回、SELECTを押しながら左を4回、SELECTを押しながら下を6回、SELECTを押しながら右を2回、SELECTを押しながら上を2回押して、全て離してRUNを押す。14タイトルのセーブデータが入っている。
With Bank 4 in an unused state,* press RUN + SELECT + I + II and turn the power on. At the title screen, hold LEFT and press I four times, then hold DOWN and press I two times, then hold RIGHT and press I two times, then hold UP and press I two times. Then, hold SELECT and press LEFT four times, then hold SELECT and press DOWN six times, then hold SELECT and press RIGHT two times, then hold SELECT and press UP two times.** Finally, release everything and press RUN. You will find save data for 14 games [in Bank 4].
*There is no way to delete the banks, is there? This might mean that if you've ever used Bank 4, the only way you could try this is if you sever and reconnect the battery!
**It isn't very clear about whether you're supposed to let go of SELECT after each set or keep it pressed the whole time.
In case that's not confusing enough, this other version of it has some differences. I wonder what the original publication of the code said? I might actually have that...
EDIT: I found it in a PCE magazine pack-in booklet. This is version appears to be correct.
天の声バンクの裏技を試してみることに。
・RUN、SELECT、I、II、左上を押しながら電源を入れる。
・左とI同時押し4回
・下とI同時押し6回
・右とI同時押し2回
・上とI同時押し2回
・SELECTを押しながら左4回、下6回、右2回、上2回
・RUNボタン
- Press RUN, SELECT, I, II and UP-LEFT and turn the power on.
- Press LEFT and I simultaneously four times
- Press DOWN and I simultaneously six times
- Press RIGHT and I simultaneously two times
- Press UP and I simultaneously two times
- Press and hold SELECT, then press RIGHT four times, DOWN six times, RIGHT two times, and UP two times.
- Press RUN
Any brave volunteers willing to try and get this to work? Apparently, you'll have saves for 14 Hudson games, including some RPGs. One is Tengai Makyo Ziria with really good stats and equipment, apparently.