Sega Master System Cart Pinout
Here's the pinout for the Master System cart port. I found it over here.

Back
Front
+5V12WR
Mreq3 4ROM/RAM
M8-B56 A14
A1378A8
A9910A11
M0-71112 A10
CrtOe1314D7
D61516D5
D417 18D3
GND1920GND
GND2122D2
D12324D0
A02526A1
A22728A3
A42930A5
A63132A7
A123334??
+5V3536A15
M13738IoReq
Refresh3940Halt
Wait4142Int
JyDs4344BusReq
BusAck4546Reset
Clk4748JRead
MC-F4950NMI



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