
Between 1985 and 1988, Sega released a few arcade machines based on
System E hardware. This was basically the same as a Master System and
had an 8MHz Zilog Z-80B processor. The machines were cheaper versions
of 16-bit machines. In the case of Riddle of Pythagoras, it was a
cheap version of Gigas, Sega's answer to
Taito's
Arkanoid.