Chance Memory Map

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Memory Map

The following is a memory map that was generated based on the MAME source code (.180). This information is only as accurate as the MAME driver is. If you see any errors, please let me know what that error is.

The Memory Area is related to where the information is from (CPU, Sound Board, etc..), and it may also reflect what it has in common with other hardware.

Chance (Playmatic, 1978)

Memory Area:chance_map

Address Range	Length	Function	Description
0x0000-0x0BFF	3072	ROM, Region	roms, 0
0x0C00-0x0C1F	32	RAM
0x0E00-0x0E1F	32	RAM, Shared	nvram (// capacitor acting as a 2-month "battery")

Memory Area:play_1_io

Address Range

Length

Function

Description

0x0001

Read Port, Write

IN1, port01_w (//segments)

0x0001	Other	Active High
0x0002	Other	Active High
0x0004	Other	Active High
0x0008	Other	Active High
0x0010	Other	Active High
0x0020	Other	Active High
0x0040	Start	Active High
0x0080	Other	Active High

0x0002

Read Port, Write

IN2, port02_w (// N1-8)

0x0001	Other	Active High
0x0002	Other	Active High
0x0004	Other	Active High
0x0008	Other	Active High
0x0010	Other	Active High
0x0020	Other	Active High
0x0040	Other	Active High
0x0080	Other	Active High

0x0003

Read Port, Write

IN3, port03_w (// D1-4)

0x0001	Other	Active High
0x0002	Other	Active High
0x0004	Other	Active High
0x0008	Other	Active High
0x0010	Other	Active High
0x0020	Other	Active High
0x0040	Other	Active High
0x0080	Other	Active High

0x0004

Read Port, Write

IN4, port04_w (// U1-8)

0x0001	Other	Active High
0x0002	Other	Active High
0x0004	Other	Active High
0x0008	Other	Active High
0x0010	Other	Active High
0x0020	Other	Active High
0x0040	Other	Active High
0x0080	Other	Active High

0x0005

Read Port, Write

IN5, port05_w (// V1-8)

0x0001	Other	Active High
0x0002	Other	Active High
0x0004	Other	Active High
0x0008	Other	Active High
0x0010	Other	Active High
0x0020	Other	Active High
0x0040	Other	Active High
0x0080	Other	Active High

0x0006

Read Port, Write

IN6, port06_w (// W1-8)

0x0001	Other	Active Low
0x0002	Other	Active Low
0x0004	Other	Active Low
0x0008	Other	Active Low
0x0010	Other	Active Low
0x0020	Coin 1	Active Low
0x0040	Coin 2	Active Low
0x0080	Coin 3	Active Low

0x0007

Read

port07_r

Memory Area:play_1_map

Address Range	Length	Function	Description
0x0000-0x07FF	2048	ROM, Region	roms, 0
0x0800-0x081F	32	RAM, Shared	nvram (// capacitor acting as a 2-month "battery")
0x0C00-0x0C1F	32	RAM

ROM Map for this game

This is the ROM map for the game. This should tell you what address the ROM is at, how big it is, what it's used for.

Memory Area:roms

Address Range	Length	Label/Location	Description
0x0000-0x03FF	1024	chance_a.bin	CRC(3cd9d5a6)
0x0400-0x07FF	1024	chance_b.bin	CRC(a281b0f1)
0x0800-0x09FF	512	chance_c.bin	CRC(369afee3)