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グラフィック認証済み未処理2021-05-25 08:592021-06-04 14:34
テスターjkburks担当者 ソースmermaid.cpp
セット yachtmn, mermaid
mermaid - ヨットマン / Mermaid
yachtmn - ヨットマン
概 要夜のグラフィックが再現されていない。
詳 細Mermaid flyer text:
Be careful of your sailing at night
(watch out for reefs during night voyages)

This night sailing feature is currently unemulated in MAME.

When you launch either Yachtsman or Mermaid you will notice a single column of light blue pixels descend either side of the play field. This is an emulation bug that does not occur on real hardware, but it is related to the missing night graphics.

The game is composed of 5 sailing levels that repeat. The night sailing happens on levels 2, 4 & 5.

It starts with the blue pixel edges appearing suddenly on each side of the play field. They then scroll down the screen slowly and disappear. Next a siren sounds for a while as you navigate a simplified play field. Eventually the siren stops, then the blue pixels descend the screen once more and disappear.

What is supposed to happen here is the blackening of the screen like a falling curtain. Once the screen has gone black, a ray of light shines out from a location off-screen in the upper left. This beam of light rotates to simulate a spinning light house. The player must memorize the layout of the screen and navigate safely. This is why the play field has so few obstacles.

When the section ends, the light house beam and the siren stop, then the daylight descends like a curtain drop. Those blue pixel columns are some sort of fragment of this unemulated feature, though I have no idea why it occurs in the title screen.
再現手順Launch Yachtsman and observe the blue pixel columns.

Load one of the attached save states to see where the night sailing is supposed to occur.
追加情報I have uploaded a set of 3 save states made with MAME 0.231 – no cheats. Each file was created a few seconds before the night sailing begins. The file numbers correspond to the game level.

It is not easy to find hardware videos of this game. This twitter link shows the end of one night sailing voyage. It is filmed with a phone, but this is the best reference I have.
添付ファイルzip fileyachtmn.zip (2021-05-25 08:59)