[MAME]

Bigfoot Bonkers

Memory map (preliminary)


  0000-07ff ROM

  1c00-1c1f RAM 	CPU scratch pad is first 32 bytes of video RAM(not displayed)

  1c20-1eff RAM 	video buffer
			xxxx	D0 - D5 character select
					D6		horz line below character (row #9)
					D7		vert line right of character (bit #0)

  1f00-1f03 		R/W hardware

			1f00 W	   audio channels
					D4 unused
					D5 tone 1
					D6 tone 2
					D7 unused
			1f00 R	   player 1 joystick
					D0 up
					D1 down
					D2 right
					D3 left

			1f01 W	D0 - D7 unused
			1f01 R	   player 2 joystick
					D0 up
					D1 down
					D2 right
					D3 left

			1f02 W	D0 - D7 unused
			1f02 R	   player 1 + 2 buttons
					D0 unused
					D1 unused
					D2 unused
					D3 unused

			1f03 W		attract mode
					D0 toggle on attract mode
					   (attract mode switched off by coin detected)
					D4 clear coin detected toggle
			1f03 R		coinage, coin detected and start buttons
					D0 coin 1/2 (DIP switch 4)
					D1 start
					D2 start
					D3 coin detected

  1f04-1f07 		Read only hardware

			1f04 R	   vertical scan counter
					D0 60 Hz
					D1 120 Hz
					D2 240 Hz
					D3 480 Hz

			1f05 R	   vertical scan counter
					D0 7.860 KHz
					D1 3.960 KHz
					D2 1.980 KHz
					D3 960 Hz

			1f06 R	D0 - D7 unused

			1f07 R	D0 - D7 unused

-

