* Additional Scart Connector and TV Modulator.
[[File:GX4000 PCB Top.jpg|200px100px|left]]
* '''Board: 2700-017P-4, MC0123C, Copyright 1990, K1'''
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[[File:GX 4000 MC0123C K4 bilgisayarlarim 736001086319 MA.jpg|200px100px|left]]
* '''Board: 2700-017P-4, MC0123C, Copyright 1990, K4'''
* Looks same as above (only the "K4" text near the LED changed).