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Quoted from wdennie:system 7
Not possible. System 7s have a 7-segment LED indicator.
If you look closely, the board on IPDB has solder pads underneath, OP's does not. Though the System 3 and 4 boardsets are nearly identical, aside from the System 4 having sockets at IC14 and IC26. If I had to guess, it's either a later System 3 board converted to a System 4 board, or just a straight up System 4 board since it has a socket in the rightmost position of the ROM section.
Quoted from someotherguy:I thought system 3's don't even have a spot for that.
Some do. The first few System 3 games had the blank solder pads, but later System 3 games had the empty socket underneath.
System 4 MPUs are pretty much identical to System 3, except for the additional sockets in a system 4 which can be added to the later revision of the System 3 boardset.
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