Up'n Down (Arcade)

Developer Credit/Build Date
Present on the chip labelled/in MAME file epr5516a.129, at offset while the ROM is still encrypted: 19/SEP 1983  MASATOSHI,MIZUNAGA

The message is not present in RAM, as it gets decrypted into garbage. Masatoshi Mizunaga (despite the comma there is only one name here) is discussed below.

Hidden Message
Present on the chip labelled/in MAME file epr-5519.132, at, while the ROM is still encrypted:

SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASATOSHI MIZUNAGA SECURITY BY MASA

GAME NAME BY UP'N DOWN GAME NAME BY UP'N DOWN GAME NAME BY UP'N DOWN GAME NAME BY UP'N DOWN SEGA ENTERPRISES JAPAN SEGA ENTERPRISES JAPAN SEGA ENTERPRISES JAPAN SEGA ENTERPRISES JAPAN SEGA ENTERPRISES JAP

[[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[ DONT COPY !!!!!!  ]]] [[[[ DONT COPY !!!!!!

UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEPTEMBER 1983 UP BY 13 SEP

yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi ni shigoto o sasuna !!?? yasymi n

yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !! yasumi ga hoshii !! yasumuzo !!

The message shown has been reformatted for clarity. In the ROM, it is a continuous byte stream with spaces to pad at uneven lengths and which ends with a single space to pad to an even 16 bytes. Parts of the message that are cut off at the end are cut off in the original; there seems to be no pattern, and Mizunaga may have used an automated tool to insert the message. There does not seem to be consistent line length between each part.

The Japanese translates to: Don't make me work on a holiday!!?? Don't make me work on a holiday!!?? Don't make me work on a holiday!!?? Don't make me work on a holiday!!?? Don't make me work on a holiday!!?? Don't make me work on a holiday!!?? Don't make me work on a holiday!!??

I want a holiday!! I'm taking time off!! I want a holiday!! I'm taking time off!! I want a holiday!! I'm taking time off!! I want a holiday!! I'm taking time off!! I want a holiday!! I'm taking time off!! I want a holiday!! I'm taking time off!! I want a holiday!! I'm taking time off!!

Masatoshi Mizunaga was a programmer at Sega of Japan who worked on all the games the company produced internally, which it seemed to have started doing in 1982; it appears he grew weary by this point, especially since he was the only one who worked on every game, typically doing either programming or copy protection...or for some games, both.