[May/24/2001]

Gridlee
(c) 1982, Videa

These ROMs were dumped from the only known existing prototype, owned by
Dale Luck.

Permission to redistribute these ROMs freely, for non-commercial use in
the MAME emulator, has been granted by the original owners: Howard Delman,
Roger Hector, and Ed Rotberg.

Below is a copy of the final email from Dale.

> From: Dale Luck <DLuck@xxxxxxxx.com>
> To: agiles@mame.net
> Subject: RE: Forwarded message
> Date: Fri, 27 Apr 2001 19:31:08 -0700
>
> Hello Aaron,
> I've received email from Roger, Ed, and Howard giving permission to use the
> roms. I've sent the ok to Al to release them to you. Good luck, have fun.
> Remember that commercial use of the rom contents is prohibited, and each of
> the fellows would like a copy of the final work so they can finally play
> Gridlee themselves.
> Thanks a bunch.
> I know its going to be a pretty big job.
> Dale Luck


-

[MAME]

	Videa Gridlee 

	Memory map


	========================================================================
	CPU #1
	========================================================================
	0000-007F   R/W   xxxxxxxx    Sprite RAM (32 entries x 4 bytes)
	            R/W   xxxxxxxx       (0: image number)
	            R/W   --------       (1: unused?)
	            R/W   xxxxxxxx       (2: Y position, offset by 17 pixels)
	            R/W   xxxxxxxx       (3: X position)
	0080-07FF   R/W   xxxxxxxx    Program RAM
	0800-7FFF   R/W   xxxxxxxx    Video RAM (256x240 pixels)
	            R/W   xxxx----       (left pixel)
	            R/W   ----xxxx       (right pixel)
	9000          W   -------x    Player 1 LED
	9010          W   -------x    Player 2 LED
	9020          W   -------x    Coin counter
	9060          W   -------x    Unknown (written once at startup)
	9070          W   -------x    Cocktail flip
    9200          W   --xxxxxx    Palette base select
    9380          W   --------    Watchdog reset
    9500        R     ---xxxxx    Trackball Y position
                R     ---x----    Sign of delta
                R     ----xxxx    Cumulative magnitude
    9501        R     ---xxxxx    Trackball X position
                R     ---x----    Sign of delta
                R     ----xxxx    Cumulative magnitude
    9502        R     ------x-    Fire button 2
                R     -------x    Fire button 1
    9503        R     --xx----    Coinage switches
                R     ----x---    2 player start
                R     -----x--    1 player start
                R     ------x-    Right coin
                R     -------x    Left coin
    9600        R     x-------    Reset game data switch
                R     -x------    Reset hall of fame switch
                R     --x-----    Cocktail/upright switch
                R     ---x----    Free play switch
                R     ----xx--    Lives switches
                R     ------xx    Bonus lives switches
    9700        R     x-------    VBLANK
                R     -x------    Service advance
                R     --x-----    Service switch
    9820        R     xxxxxxxx    Random number generator
    9828-982C     W   ????????    Unknown
    9830-983F     W   ????????    Unknown (sound-related)
    9C00-9CFF   R/W   --------    NVRAM
	A000-FFFF   R     xxxxxxxx    Fixed program ROM
	========================================================================
	Interrupts:
		NMI not connected
		IRQ generated by 32L
		FIRQ generated by ??? (but should be around scanline 92)
	========================================================================

-
