182 lines
6.9 KiB
TeX
182 lines
6.9 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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64$\times$32 pixel graphics, and the new superchip emulator supports 128$\times$64
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graphics.
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The only problem is that they are based on a 4$\times$4 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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\begin{code}
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0122458469ABCDEF
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\end{code}
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would correspond to the following non-default mappings:
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3 $\rightarrow$ 2, 6 $\rightarrow$ 8, 7 $\rightarrow$4, 8 $\rightarrow$ 6.
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The default keymappings are:
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\begin{table}
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\begin{center}
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\begin{tabularx}{.9\textwidth}{c|ccccccccccccccccc}
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\toprule
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Chip8 & Off & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9
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& A & B & C & D & E & F\\
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\midrule
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\begin{sideways}Key\end{sideways}
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&
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% key "off"
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\begin{sideways}
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\opt{RECORDER_PAD,ONDIO_PAD,IRIVER_H100_PAD,IRIVER_H300_PAD}{\ButtonOff}
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\opt{IPOD_4G_PAD,IPOD_3G_PAD}{\ButtonMenu}
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\opt{IAUDIO_X5_PAD,IRIVER_H10_PAD,SANSA_E200_PAD,SANSA_C200_PAD%
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,GIGABEAT_PAD,MROBE100_PAD,SANSA_FUZE_PAD,SANSA_FUZEPLUS_PAD}
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{\ButtonPower}
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\opt{GIGABEAT_S_PAD}{\ButtonBack}
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\opt{PBELL_VIBE500_PAD,SAMSUNG_YH92X_PAD,SAMSUNG_YH820_PAD}{\ButtonRec}
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\opt{MPIO_HD200_PAD}{\ButtonRec + \ButtonPlay}
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\opt{MPIO_HD300_PAD}{Long \ButtonMenu}
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\end{sideways}
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&
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% Key "0"
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\begin{sideways}
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\opt{SANSA_FUZEPLUS_PAD}{\ButtonVolDown}
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\end{sideways}
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&
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% "Key "1"
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\begin{sideways}
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\opt{SANSA_FUZEPLUS_PAD}{\ButtonBack}
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\opt{RECORDER_PAD}{\ButtonFOne}
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\opt{ONDIO_PAD,SANSA_FUZEPLUS_PAD}{\ButtonUp}
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\opt{GIGABEAT_PAD,GIGABEAT_S_PAD,MROBE100_PAD}{\ButtonMenu}
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\opt{MPIO_HD200_PAD,MPIO_HD300_PAD}{\ButtonRew}
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\end{sideways}
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&
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% Key "2"
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\begin{sideways}
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\opt{IPOD_4G_PAD,IPOD_3G_PAD,SANSA_E200_PAD,SANSA_FUZE_PAD}
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{\ButtonScrollBack}
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\opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD,GIGABEAT_PAD%
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,RECORDER_PAD,ONDIO_PAD,SANSA_FUZEPLUS_PAD,GIGABEAT_S_PAD%
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,MROBE100_PAD,PBELL_VIBE500_PAD,SAMSUNG_YH92X_PAD,SAMSUNG_YH820_PAD}{\ButtonUp}
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\opt{IRIVER_H10_PAD}{\ButtonScrollUp}
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\opt{SANSA_C200_PAD}{\ButtonVolUp}
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\opt{MPIO_HD200_PAD,MPIO_HD300_PAD}{\ButtonFF}
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\end{sideways}
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&
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% Key "3"
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\begin{sideways}
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\opt{RECORDER_PAD}{\ButtonFThree}
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\opt{MROBE100_PAD,SANSA_FUZEPLUS_PAD}{\ButtonPlay}
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\opt{GIGABEAT_PAD,GIGABEAT_S_PAD}{\ButtonVolDown}
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\opt{MPIO_HD200_PAD}{\ButtonFunc}
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\opt{MPIO_HD300_PAD}{\ButtonMenu}
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\end{sideways}
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&
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% Key "4"
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\begin{sideways}
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\opt{RECORDER_PAD,ONDIO_PAD,IRIVER_H100_PAD,IRIVER_H300_PAD,IPOD_4G_PAD%
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,IPOD_3G_PAD,IAUDIO_X5_PAD,IRIVER_H10_PAD,SANSA_E200_PAD%
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,SANSA_C200_PAD,GIGABEAT_PAD,GIGABEAT_S_PAD,MROBE100_PAD%
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,SANSA_FUZE_PAD,PBELL_VIBE500_PAD,SANSA_FUZEPLUS_PAD,SAMSUNG_YH92X_PAD%
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,SAMSUNG_YH820_PAD}{\ButtonLeft}
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\opt{MPIO_HD200_PAD}{\ButtonRec}
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\opt{MPIO_HD300_PAD}{\ButtonEnter}
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\end{sideways}
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&
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% Key "5"
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\begin{sideways}
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\opt{RECORDER_PAD}{\ButtonPlay}
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\opt{ONDIO_PAD}{\ButtonMenu}
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\opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD,SANSA_E200_PAD%
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,SANSA_C200_PAD,GIGABEAT_PAD,GIGABEAT_S_PAD,MROBE100_PAD%
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,SANSA_FUZE_PAD,SANSA_FUZEPLUS_PAD}
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{\ButtonSelect}
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\opt{IPOD_4G_PAD,IPOD_3G_PAD,IRIVER_H10_PAD,SAMSUNG_YH92X_PAD,SAMSUNG_YH820_PAD}%
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{\ButtonPlay}
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\opt{PBELL_VIBE500_PAD}{\ButtonOK}
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\opt{MPIO_HD200_PAD}{\ButtonPlay}
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\opt{MPIO_HD300_PAD}{\ButtonRec}
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\end{sideways}
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&
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% Key "6"
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\begin{sideways}
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\opt{RECORDER_PAD,ONDIO_PAD,IRIVER_H100_PAD,IRIVER_H300_PAD,IPOD_4G_PAD%
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,IPOD_3G_PAD,IAUDIO_X5_PAD,IRIVER_H10_PAD,SANSA_E200_PAD%
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,SANSA_C200_PAD,GIGABEAT_PAD,GIGABEAT_S_PAD,MROBE100_PAD%
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,SANSA_FUZE_PAD,PBELL_VIBE500_PAD,SANSA_FUZEPLUS_PAD,SAMSUNG_YH92X_PAD%
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,SAMSUNG_YH820_PAD}{\ButtonRight}
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\opt{MPIO_HD200_PAD}{\ButtonVolDown}
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\opt{MPIO_HD300_PAD}{\ButtonPlay}
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\end{sideways}
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&
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% Key "7"
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\begin{sideways}
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\opt{RECORDER_PAD}{\ButtonFTwo}
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\opt{MROBE100_PAD}{\ButtonDisplay}
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\opt{GIGABEAT_PAD,GIGABEAT_S_PAD}{\ButtonVolUp}
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\opt{MPIO_HD200_PAD}{\ButtonVolUp}
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\opt{MPIO_HD300_PAD}{\ButtonScrollUp}
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\opt{SANSA_FUZEPLUS_PAD}{\ButtonBottomLeft}
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\end{sideways}
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&
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% Key "8"
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\begin{sideways}
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\opt{RECORDER_PAD,ONDIO_PAD,IRIVER_H100_PAD,IRIVER_H300_PAD%
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,GIGABEAT_PAD,GIGABEAT_S_PAD,MROBE100_PAD,PBELL_VIBE500_PAD,SAMSUNG_YH92X_PAD%
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,SAMSUNG_YH820_PAD}{\ButtonDown}
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\opt{IPOD_4G_PAD,IPOD_3G_PAD,SANSA_E200_PAD,SANSA_FUZE_PAD}
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{\ButtonScrollFwd}
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\opt{IAUDIO_X5_PAD,SANSA_FUZEPLUS_PAD}{\ButtonDown}
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\opt{IRIVER_H10_PAD,MPIO_HD300_PAD}{\ButtonScrollDown}
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\opt{SANSA_C200_PAD}{\ButtonVolDown}
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\end{sideways}
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&
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% Key "9"
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\begin{sideways}
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\opt{RECORDER_PAD}{\ButtonOn}
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\opt{GIGABEAT_PAD}{\ButtonA}
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\opt{GIGABEAT_S_PAD}{\ButtonPlay}
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\opt{SANSA_FUZEPLUS_PAD}{\ButtonBottomRight}
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\end{sideways}
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&
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% Key "A"
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\begin{sideways}
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\opt{SANSA_FUZEPLUS_PAD}{\ButtonVolUp}
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\end{sideways}
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&
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% Key "B"
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&
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% Key "C"
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&
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% Key "D"
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&
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% Key "E"
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&
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% Key "F"
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\\\bottomrule
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\end{tabularx}
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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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