[MAME] 

PLAYER'S EDGE PLUS (PE+)

--- Technical Notes ---
Name:    Player's Edge Plus (PP0516) Double Bonus Draw Poker.
Company: IGT - International Gaming Technology
Year:    1987

Hardware:
CPU =  83c02             ; I8052 compatible
VIDEO = SY6545           ; CRTC6845 compatible
SND =  AY-3-8912         ; AY8910 compatible

History:

This form of video poker machine has the ability to use different game roms.  The operator
changes the game by placing the rom at U68 on the motherboard.  This driver is currently valid
for the PP0516 game rom, but should work with all other compatible game roms as cpu, video,
sound, and inputs is concerned.  Some games can share the same color prom and graphic roms,
but this is not always the case.  It is best to confirm the game, color and graphic combinations.

The game code runs in two different modes, game mode and operator mode.  Game mode is what a
normal player would see when playing.  Operator mode is for the machine operator to adjust
machine settings and view coin counts.  The upper door must be open in order to enter operator
mode and so it should be mapped to an input bank if you wish to support it.  The operator
has two additional inputs (jackpot reset and self-test) to navigate with, along with the
normal buttons available to the player.

A normal machine keeps all coin counts and settings in a battery-backed ram, and will
periodically update an external eeprom for an even more secure backup.  This eeprom
also holds the current game state in order to recover the player from a full power failure.

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