
INTRODUCTION
------------

ProSystem is the best emulator of Atari 7800 game
console, running on Windows system. 

It has been written by Greg Stanton 
(see http://home.comcast.net/~gscottstanton/) 

PSP7800 is a port on PSP of the version v1.0 of
ProSystem, done by myself in January 2007.

CONTROL
------------

- Virtual keyboard

In the 7800 emulator window, there are three
different mapping (standard, left trigger, and right
Trigger mappings).  You can toggle between while
playing inside the emulator using the two PSP
trigger keys.

    -------------------------------------
    PSP        Atari 7800  (standard)
  
    Cross      Fire1
    Square     Fire2
    Triangle   L Diff
    Circle     R Diff

    Left       Left
    Down       Down
    Right      Right
    Up         Up

    Analog     Joystick
    -------------------------------------
    PSP        Atari 7800  (left trigger)

    Square     Hotkey FPS
    Triangle   Hotkey Load state
    Circle     Swap digital / Analog
    Cross      SAVE Snapshot
    Up         Inc delta Y
    Down       Dec delta Y
    Left       Render mode
    Right      Render mode

    -------------------------------------
    PSP        Atari 7800  (right trigger)

    Square     Pause 
    Triangle   Reset 
    Cross      Auto-fire
    Circle     Select

    Up         Up
    Down       Down
    Left       Dec Fire
    Right      Inc Fire

    Analog     Joystick


Press Start+L+R to exit and return to XMB
Press Select    to enter in emulator main menu.
Press Start     open/close the On-Screen keyboard

In the main menu

  RTrigger   Reset the emulator

  Triangle   Go Up directory
  Cross      Valid
  Circle     Valid
  Square     Go Back to the emulator window

The On-Screen Keyboard of "Danzel" and "Jeff Chen"

Use Analog stick to choose one of the 9 squares, and
use Triangle, Square, Cross and Circle to choose one
of the 4 letters of the highlighted square.

Use LTrigger and RTrigger to see other 9 squares
figures.

- IR keyboard

  You can also use IR keyboard. Edit the
pspirkeyb.ini file to specify your IR keyboard
model, and modify eventually layout keyboard files
in the keymap directory.

The following mapping is done :

  IR-keyboard   PSP

  Cursor        Digital Pad

  Tab           Start
  Ctrl-W        Start

  Escape        Select
  Ctrl-Q        Select

  Ctrl-E        Triangle
  Ctrl-X        Cross
  Ctrl-S        Square
  Ctrl-F        Circle
  Ctrl-Z        L-trigger
  Ctrl-C        R-trigger

In the emulator window you can use the IR keyboard to
enter letters, special characters and digits.

LOADING ROM FILES (A78)
------------

If you want to load rom images in the virtual drive of
your emulator, you have to put your rom file (with
.zip or .a78 file extension) on your PSP memory stick
in the 'roms' directory. 

Then, while inside Atari 7800 emulator, just press
SELECT to enter in the emulator main menu, choose
"Load ROM" and then using the file selector choose one
game file to load in your emulator. 

You can use the virtual keyboard in the file
requester menu to choose the first letter of the game
you search (it might be useful when you have tons of
games in the same folder). Entering several time the
same letter let you choose sequentially files
beginning with the given letter. You can use the Run
key of the virtual keyboard to launch the rom.

CHEAT CODE (.CHT)
----------

You can use cheat codes with PSP-7800 emulator.
You can add your own cheat codes in the cheat.txt file
and then import them in the cheat menu.
All cheat codes you have specified for a game can be 
save in a CHT file in 'cht' folder.
Those cheat codes would then be automatically loaded
when you start the game.

The CHT file format is the following :
#
# Enable, Address, Value, Comment
#
1,36f,3,Cheat comment

Using the Cheat menu you can search for modified bytes
in RAM between current time and the last time you
saved the RAM. It might be very usefull to find "poke"
address by yourself, monitoring for example life numbers.

To find a new "poke address" you can proceed as follow :

Let's say you're playing Xevious and you want to find 
the memory address where "number lives" is stored.

. Start a new game in Xevious
. Enter in the cheat menu. 
. Choose Save Ram to save initial state of the memory. 
. Specify the number of lives you want to find in
  "Scan Old Value" field.
  (for Xevious the initial lives number is 4)
. Go back to the game and loose a life.
. Enter in the cheat menu. 
. Specify the number of lives you want to find in
  "Scan New Value" field.
  (for Xevious the lives number is now 3)
. In Add Cheat you have now one matching Address
  (for Xevious it's 1A6E)
. Specify the Poke value you want (for example 4) 
  and add a new cheat with this address / value.

The cheat is now activated in the cheat list 
and you can save it using the "Save cheat" menu.

Let's enjoy Xevious with infinite life !!

COMMENTS
------------

You can write your own comments for games using
the "Comment" menu.  The first line of your comments
would then be displayed in the file requester menu
while selecting the given file name (roms, keyboard,
settings).


SETTINGS
------------

You can modify several settings value in the settings
menu of this emulator.  The following parameters are
available :

  Sound enable : 
    enable or disable the sound

  Display fps : 
    display real time fps value 

  Speed limiter :
    limit the speed to a given fps value

  Skip frame : 
    to skip frame and increase emulator speed

  Render mode : 
    many render modes are available with different
    geometry that should covered all games
    requirements

  Delta Y : 
    move the center of the screen vertically

  Vsync : 
    wait for vertical signal between each frame displayed

  Swap Analog/Cursor : 
    swap key mapping between PSP analog pad and PSP
    digital pad

  Active Joystick : 
    Joystick player, it could be 1 or 2

  Auto fire period : 
    auto fire period

  Auto fire mode : 
    auto fire mode active or not

  Display LR led : 
    draw a small blue rectangle in top of the screen
    when trigger keys are pressed

  Clock frequency : 
    PSP clock frequency, by default the value is set
    to 222Mhz, and should be enough for most of all
    games.

  Enjoy,

            Zx

