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Document Title: [GalaxianMap.html (html file)]

Galaxian Memory Map
Galaxians hardware info 
-----------------------

Compiled from information provided by friends and Uncles on RGVAC.
 
            AAAAAA
            111111AAAAAAAAAA     DDDDDDDD   Schem   function
HEX         5432109876543210 R/W 76543210   name

5000-57FF   01010AAAAAAAAAAA R/W DDDDDDDD   !Vram   Character ram
5800-583F   01011AAAAAAAAAAA R/W DDDDDDDD   !OBJRAM Screen attributes
5840-585F   01011AAAAAAAAAAA R/W DDDDDDDD   !OBJRAM Sprites
5860-5FFF   01011AAAAAAAAAAA R/W DDDDDDDD   !OBJRAM Bullets

6000        0110000000000000 R   -------D   !SW0    coin1   
6000        0110000000000000 R   ------D-   !SW0    coin2
6000        0110000000000000 R   -----D--   !SW0    p1 left
6000        0110000000000000 R   ----D---   !SW0    p1 right
6000        0110000000000000 R   ---D----   !SW0    p1shoot
6000        0110000000000000 R   --D-----   !SW0    table ??
6000        0110000000000000 R   -D------   !SW0    test 
6000        0110000000000000 R   D-------   !SW0    service

6000        0110000000000001 W   -------D   !DRIVER lamp 1 ??
6001        0110000000000001 W   -------D   !DRIVER lamp 2 ??
6002        0110000000000010 W   -------D   !DRIVER lamp 3 ??
6003        0110000000000011 W   -------D   !DRIVER coin control
6004        0110000000000100 W   -------D   !DRIVER Background lfo freq bit0
6005        0110000000000101 W   -------D   !DRIVER Background lfo freq bit1
6006        0110000000000110 W   -------D   !DRIVER Background lfo freq bit2
6007        0110000000000111 W   -------D   !DRIVER Background lfo freq bit3

6800        0110100000000000 R   -------D   !SW1    1p start  
6800        0110100000000000 R   ------D-   !SW1    2p start
6800        0110100000000000 R   -----D--   !SW1    p2 left
6800        0110100000000000 R   ----D---   !SW1    p2 right
6800        0110100000000000 R   ---D----   !SW1    p2 shoot
6800        0110100000000000 R   --D-----   !SW1    no used
6800        0110100000000000 R   -D------   !SW1    dip sw1
6800        0110100000000000 R   D-------   !SW1    dip sw2

6800        0110100000000000 W   -------D   !SOUND  reset background F1 
                                                    (1=reset ?)
6801        0110100000000001 W   -------D   !SOUND  reset background F2
6802        0110100000000010 W   -------D   !SOUND  reset background F3
6803        0110100000000011 W   -------D   !SOUND  Noise on/off
6804        0110100000000100 W   -------D   !SOUND  not used
6805        0110100000000101 W   -------D   !SOUND  shoot on/off
6806        0110100000000110 W   -------D   !SOUND  Vol of f1
6807        0110100000000111 W   -------D   !SOUND  Vol of f2

7000        0111000000000000 R   -------D   !DIPSW  dip sw 3
7000        0111000000000000 R   ------D-   !DIPSW  dip sw 4
7000        0111000000000000 R   -----D--   !DIPSW  dip sw 5
7000        0111000000000000 R   ----D---   !DIPSW  dip s2 6

7001        0111000000000001 W   -------D   9Nregen NMIon
7004        0111000000000100 W   -------D   9Nregen stars on
7006        0111000000000110 W   -------D   9Nregen hflip
7007        0111000000000111 W   -------D   9Nregen vflip

Note: 9n reg,other bits  used on moon cresta for extra graphics rom control.

7800        0111100000000000 R   --------   !wdr    watchdog reset
7800        0111100000000000 W   DDDDDDDD   !pitch  Sound Fx base frequency