unknown 'Space Invaders' gambling game (unencrypted)

Game Information
manufacturer <unknown>
year 199?
clone of unksig
other clones unksiga unksigb
genre N/A
downloads 37
Screenshots
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Download Details
split set unksigb.zip 8.47k
parent set unksig.zip 12.33k ↗
standalone set unksigb.7z 8.71k
Driver Details
source misc/4enraya.cpp
status good
emulation good
savestate supported
Screen Details
display screen
type raster
orientation horizontal
width 256px
height 224px
refresh 60mhz
Input Details
player 1
type joy
buttons 1
directions 8
Chipset Details
name Zilog Z80
clock 3.81mhz
name Speaker
clock N/A
name AY-3-8910A PSG
clock 1.91mhz
ROM Details
name size crc
u144 32.00k 8f19f1d3
u172 32.00k f8a358fe
u171 32.00k 56ac5874
u170 8.00k f9c686fc