57327044cd
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10284 a1c6a512-1295-4272-9138-f99709370657
62 lines
2.9 KiB
TeX
62 lines
2.9 KiB
TeX
\subsection{\label{ref:Chip8emulator}Chip{}-8 Emulator}
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Chip8 is a kind of assembly language for a long-gone architecture.
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This plugin runs games written using the chip8 instructions.
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To start a game open a \fname{.ch8} file in the \setting{File Browser}
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There are lots of tiny Chip8 games (usually only about 256 bytes to a
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couple of KB) which were made popular by the HP48
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calculator's emulator for them. The original Chip8 had
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64x32 pixel graphics, and the new superchip emulator supports 128x64
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graphics.
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The only problem is that they are based on a 4x4 keyboard, but since most
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games do not use all of the buttons, this can easily be worked around.
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To do this, one may put a \fname{``.c8k''} file with the same name as the
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original program which contains new key mappings (for \fname{BLINKY.ch8}, one
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writes a \fname{BLINKY.c8k} file). That \fname{.c8k} file contains 16
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characters describing the mapping from the Chip8 keyboard to the default key
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mapping (that way, several Chip8 keys can be pressed using only one
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Rockbox key). For example, a file containing the single line:\\\\
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\textbf{0122458469ABCDEF}\\\\
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would correspond to the following non-default mappings:\\\\
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3 $\rightarrow$ 2\hspace{1cm} 6 $\rightarrow$ 8\hspace{1cm} 7 $\rightarrow$
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4\hspace{1cm} 8 $\rightarrow$ 6\\\\
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Default keymappings:
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\begin{table}
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\begin{center}
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\begin{footnotesize}
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\begin{tabular}{@{}*{17}{@{\hspace{1mm}}c@{\hspace{1mm}}|}@{\hspace{1mm}}
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c@{}}\toprule
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\textbf{Chip8 key} & Off & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & A & B
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& C & D & E & F\\
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\textbf{Key} &
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\opt{RECORDER_PAD}{\ButtonOff & & \ButtonFOne & \ButtonUp &
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\ButtonFThree & \ButtonLeft & \ButtonPlay & \ButtonRight &
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\ButtonFTwo & \ButtonDown & \ButtonOn & & & & & &}
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\opt{ONDIO_PAD}{\ButtonOff & & & \ButtonUp & & \ButtonLeft & \ButtonMenu
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& \ButtonRight & & \ButtonDown & & & & & & &}
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\opt{IRIVER_H100_PAD,IRIVER_H300_PAD}{\ButtonOff & & \ButtonUp & &
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\ButtonLeft & \ButtonSelect & \ButtonRight & & \ButtonDown & & & &
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& & &}
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\opt{IPOD_4G_PAD}{\ButtonMenu & & & \ButtonScrollBack & & \ButtonLeft &
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\ButtonPlay & \ButtonRight & & \ButtonScrollFwd & & & & & & &}
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\opt{IAUDIO_X5_PAD}{\ButtonPower & & & \ButtonUp & & \ButtonLeft &
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\ButtonSelect & \ButtonRight & & \ButtonDown & & & & & & &}
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\\\bottomrule
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\end{tabular}
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\end{footnotesize}
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\end{center}
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\end{table}
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Some places where can you can find \fname{.ch8} files:
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\begin{itemize}
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\item The PluginChip8 page on www.rockbox.org has several attached:
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\wikilink{PluginChip8}
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\item Check out the HP48 chip games section:
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\url{http://www.hpcalc.org/hp48/games/chip/}
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\item PC emulator by the guy who wrote the HP48 emulator:
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\url{http://www.pdc.kth.se/~lfo/chip8/CHIP8.htm}
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\item Links to other chip8 emulators:
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\url{http://www.zophar.net/chip8.html}
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\end{itemize}
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