[MAME]

SEGA "Space Tactics"

Master processor - Intel 8080A

Memory Map:

0000-2fff ROM                       R
4000-47ff RAM                       R/W
5000-5fff switches/status           R
6000-6fff dips sw                   R
6000-600f Coin rjct/palette select  W
6010-601f sound triggers            W
6020-602f lamp latch                W
6030-603f speed latch               W
6040-605f shot related              W
6060-606f score display             W
60a0-60e0 sound triggers2           W
7000-7fff RNG/swit                  R     LS Nibble are a VBlank counter
								          used as a RNG
8000-8fff swit/stat                 R
8000-8fff offset RAM                W
9000-9fff V pos reg.                R     Reads counter from an encoder wheel
a000-afff H pos reg.                R     Reads counter from an encoder wheel
b000-bfff VRAM B                    R/W   alphanumerics, bases, barrier,
                                          enemy bombs
d000-dfff VRAM D                    R/W   furthest aliens (scrolling)
e000-efff VRAM E                    R/W   middle aliens (scrolling)
f000-ffff VRAM F                    R/W   closest aliens (scrolling)

-