Viewing the cartridge port from above, such that the cartridge label would face the bottom of the picture:

Applies to: Master System consoles released in Japan and Korea; SG-1000 and SC-3000 consoles released worldwide.

The pins on the A side are the same for SG-1000, SC-3000, Mark III and Master System. The B side is different:

PinSG-1000SG-1000 IISC-3000Mark IIIMaster System
B1VCCVCCVCCVCCVCC
B2VCCVCCVCC!CSCN4VCC
B3!OSRAM!CSRAM!OSRAM!CSRAM!CSRAM
B4!EXM1!EXM1!CEROM!EXM1!EXM1
B5!RD!RD!MEMR!RD!RD
B6!WRWR!MEMW!WR!WR
B7ncnc!IORnc!RST
B8ncnc!IOWncnc
B9!RFSHncncnc!MREQ
B10!MREQ!MREQ!MREQ!MREQ!CE4
B11CONCONTCONCONTCONT
B12ncnc!RAS1ncnc
B13ncnc!CAS1ncnc
B14ncncRAM A7ncnc
B15ncnc!RAS2ncnc
B16ncnc!CAS2ncnc
B17ncnc!MUXncnc
B18A14A14A14A14A14
B19!EXM2!EXM2A15!EXM2!EXM2
B20!M1ncncncnc
B21GNDGNDGNDGNDGND
B22GNDGNDGNDGNDGND

Pin names taken from schematics at http://cmpslv2.starfree.jp/Sg1000/EnrSG.htm http://cmpslv2.starfree.jp/Sc3000/EnrSC.htm http://www.smspower.org/forums/files/sega_mark_iii_136.png http://www.smspower.org/forums/files/master_system_jap_fm_989.png


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