Chapter 10.
Plugins
130
The menu has the following entries.
Return.
Returns you to the image
Toggle Slideshow Mode.
Enables or disables the slideshow mode.
Change Slideshow Timeout.
You can set the timeout for the slideshow between 1 sec-
ond and 20 seconds.
Show Playback Menu.
From the playback menu you can control the playback of the
currently loaded playlist and change the volume of your player.
Quit.
Quits the viewer and returns to the
File Browser
.
10.3.3. Chip-8 Emulator
Chip8 is a kind of assembly language for a long-gone architecture. This plugin runs
games written using the chip8 instructions. To start a game open a
.ch8
file in the
File
Browser
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 64
×
32 pixel graphics, and the new superchip emulator supports 128
×
64 graphics.
The only problem is that they are based on a 4
×
4 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:
Code
0122458469ABCDEF
would correspond to the following non-default mappings:
3
→
2, 6
→
8, 7
→
4, 8
→
6.
The default keymappings are:
Chip8
Off
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Key
P
o
w
er
Men
u
Up
V
olume
do
wn
Left
Select
Righ
t
V
olume
up
Do
wn
A
Some places where can you can find
.ch8
files:
The Rockbox manual
Toshiba Gigabeat F and X Series
