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

Gravitar Memory Map 
hex adr   adr bus          r/w data bus  function
E000-EFFF 111xAAAAAAAAAAAA R   DDDDDDDD	/ROM5
D000-DFFF 1101AAAAAAAAAAAA R   DDDDDDDD	/ROM4
C000-CFFF 1100AAAAAAAAAAAA R   DDDDDDDD	/ROM3
B000-BFFF 1011AAAAAAAAAAAA R   DDDDDDDD	/ROM2
A000-AFFF 1010AAAAAAAAAAAA R   DDDDDDDD	/ROM1
9000-9FFF 1001AAAAAAAAAAAA R   DDDDDDDD	/ROM0

8800      10001xxxxxxxxxxx R   D          CABINET 1
                                D         /START2
                                 D        /START1
                                  D       /THRUST2
                                   D      /ROT LEFT 2
                                    D     /ROT RIGHT 2
                                     D    /FIRE 2
                                      D   /SHIELDS 2

89C0      1000100111xxxxxx W              /SPARE WT
8980      1000100110xxxxxx W              /WDCLR
8940      1000100101DDDDDD W   DDDDDDDD   /EAROMWR
8900      1000100100xxxxxx W       DDDD   /EAROMCON
88C0      1000100011xxxxxx W              /INTACK
8880      1000100010xxxxxx W              /VGRST
8840      1000100001xxxxxx W              /VGGO

8800      10000xxxxxxxxxxx R   D          OPTION2
                                D         OPTION1
                                 D        OPTION0
                                  D       /THRUST1
                                   D      /ROT LEFT 1
                                    D     /ROT RIGHT 1
                                     D    /FIRE 1
                                      D   /SHIELDS 1

7800      01111xxxxxxxxxxx R   D          3KHZ
                                D         HALT
                                 D        /SA
                                  D       /SELF-TEST
                                    D     /COIN-AUX
                                     D    /COIN L
                                      D   /COIN R
  
7000      01110xxxxxxxxxxx R   DDDDDDDD  /EAROMRD
6800      01101xxxxxxxxxxx R/W DDDDDDDD  /I/O0
6000      01100xxxxxxxxxxx R/W DDDDDDDD  /I/O1
5000-5FFF 0101AAAAAAAAAAAA R   DDDDDDDD  /VROM3
4000-4FFF 0100AAAAAAAAAAAA R   DDDDDDDD  /VROM2
3000-3FFF 0011AAAAAAAAAAAA R   DDDDDDDD  /VROM1
2800-2FFF 00101AAAAAAAAAAA R   DDDDDDDD  /VROM0
2000-27FF 00100AAAAAAAAAAA R/W DDDDDDDD  /VRAM
0000-07FF 00000AAAAAAAAAAA R/W DDDDDDDD  /RAM