Nicole Express looks at the 8-bit Sega arcade game Flashgal:

There’s the System 1. The System E. Even the Future Spy. But Sega released games on so many different platforms around Zilog’s Z80 processor! Though today, it’s really only Sega by virtue of their role as a publisher. Let’s take a look at Flashgal.

It’s definitely not System 1. Sure, it has two Z80 CPUs– in fact, as Sega also commonly did, it’s actually using NEC-made clones, the uPD780C. Unlike the later NEC-made 8088 and 8086 clones, these are pretty much identical, just second-source parts. But look at the audio circuit– sure, there’s two square wave synthesizers, but these aren’t SN76489As, but AY-3-8610s!

Flashgal is also not a Sega product. The development is attributed by Sega Retro to Kyugo Trading, while GDRI takes it a step further and attributes the game development itself to Takeshi Tozu’s company Whiteboard, which later became Santos. Layers of contractors was pretty common in the Japanese game industry then, and isn’t unheard of now, for that matter.

You can see all the details in the post here.