Technical report on the game Densha de Go Plug and Play
In 2018, Taito shipped Densha de Go! Plug & Play, a palm-sized HDMI
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In 2018, Taito shipped Densha de Go! Plug & Play, a palm-sized HDMI “TV game” containing a complete remake of the classic 1996 train-driving arcade game. Unlike the arcade boards and consoles of the series' history, this unit is a small embedded Linux computer: an Allwinner R16 quad-core Cortex-A7 SoC with a Mali-450 GPU, booting Linux 3.4 and running a single 8 MB ARM executable named dgf.
This report dissects that executable. Every claim below was produced by one of three methods, and each section says which:
Three audiences, three levels of depth, all in the same sections:
The game decomposes into clean layers, and so does this report. Read in order, or jump:
Before the chapter-by-chapter breakdown, here is the shape of the whole machine. At 60 Hz, the game:
Each of those seven bullets is a chapter of this report. The diagram below shows how the executables' layers stack:
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