8c177221b3
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9475 a1c6a512-1295-4272-9138-f99709370657
53 lines
2.5 KiB
TeX
53 lines
2.5 KiB
TeX
\subsection{\label{ref:Chip8emulator}Chip{}-8 Emulator}
|
|
Chip8 is a kind of assembly language for a long-gone architecture.
|
|
This plugin runs games written using the chip8 instructions.
|
|
Just press PLAY on a .ch8 file to start a game.
|
|
|
|
There are lots of tiny Chip8 games (usually only about 256 bytes to a
|
|
couple of KB) which were made popular by the HP48
|
|
calculator's emulator for them. The original Chip8 had
|
|
64x32 pixel graphics, and the new superchip emulator supports 128x64
|
|
graphics.
|
|
|
|
The only problem is that they are based on a 4x4 keyboard, but since most
|
|
games do not use all of the buttons, this can easily be worked around.
|
|
|
|
To do this, one may put a ``.c8k'' file with the same name as the
|
|
original program which contains new key mappings (for BLINKY.ch8, one
|
|
writes a BLINKY.c8k file).
|
|
That c8k file contains 16 characters
|
|
describing the mapping from the Chip8 keyboard to the default key
|
|
mapping (that way, several Chip8 keys can be pressed using only one
|
|
Rockbox key). For example, a file containing the single line:\\\\
|
|
\textbf{0122458469ABCDEF}\\\\
|
|
would correspond to the following non-default mappings:\\\\
|
|
3 $\rightarrow$ 2\hspace{1cm} 6 $\rightarrow$ 8\hspace{1cm} 7 $\rightarrow$ 4\hspace{1cm} 8 $\rightarrow$ 6\\\\
|
|
Default keymappings:
|
|
\begin{table}
|
|
\begin{center}
|
|
\begin{footnotesize}
|
|
\begin{tabular}{@{}*{16}{@{\hspace{1mm}}c@{\hspace{1mm}}|}@{\hspace{1mm}}c@{}}\toprule
|
|
\textbf{Chip8 key} & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & A & B & C & D & E & F\\
|
|
\textbf{Key} &
|
|
\opt{recorder,recorderv2fm}{& F1 & UP & F3 & LEFT & PLAY & RIGHT & F2 & DOWN & ON & & & & & &}
|
|
\opt{ondio}{& & UP & & LEFT & MODE & RIGHT & & DOWN & & & & & & &}
|
|
\opt{h1xx}{& & UP & & LEFT & SELECT & RIGHT & & DOWN & & & & & & &}
|
|
\opt{h300}{& & UP & & LEFT & NAVI & RIGHT & & DOWN & & & & & & &}
|
|
\opt{ipodcolor,ipodnano}{& & Scroll back & & LEFT & PLAY & RIGHT & & Scroll forward& & & & & & &}
|
|
\\\bottomrule
|
|
\end{tabular}
|
|
\end{footnotesize}
|
|
\end{center}
|
|
\end{table}
|
|
|
|
Some places where can you can find .ch8 files:
|
|
\begin{itemize}
|
|
\item The PluginChip8 page on www.rockbox.org has several attached:
|
|
\url{http://www.rockbox.org/twiki/bin/view/Main/PluginChip8}
|
|
\item Check out the HP48 chip games section:
|
|
\url{http://www.hpcalc.org/hp48/games/chip/}
|
|
\item PC emulator by the guy who wrote the HP48 emulator:
|
|
\url{http://www.pdc.kth.se/~lfo/chip8/CHIP8.htm}
|
|
\item Links to other chip8 emulators:
|
|
\url{http://www.zophar.net/chip8.html}
|
|
\end{itemize}
|