Test Mode (Sega Mega-Tech) Updated Mar 15, 2026 · 4 min read · 0 viewing Previous Port Expander IC24 (Sega Mega-Tech) The IC24 I/O Expander CXD1095 connects the SMS Z80 data pins to various places, including the YM2612... Next No Game Load (Sega Mega-Tech) After you get game title data displaying on the Menu, you still may not get game load output on the ...