Gamepad Pinout
The Sega Master System Gamepad uses a standard DB-9 connector. Looking into the gamepad connector, the signals are as follows:
| Pin # | Signal Name | | 1 | UP | | 2 | DOWN | | 3 | LEFT | | 4 | RIGHT | | 5 | +5V | | 6 | TL | | 7 | TH | | 8 | GND | | 9 | TR |
Sega Master System Cartridge PinoutLooking at a cartridge's label side, all odds pins are in the rear 49..1 left to right, and all even pins are in the front 50..2 left to right. The connector used to interface to a cartridge is a standard 50pos 0.100" spacing dual row edge connector for 0.063" thick PCBs. Digikey # A31718-ND is a suitable connector to interface to Master System Carts.
The Sega Master System conveniently provides many Z80 control signals directly on the cartridge port - this is a developer's dream! It's wouldn't be impossible for a cartridge to include a completely separate CPU and have it steal the system's bus. | Pin # | Description | Pin # | Description | | 1 | +5V | 2 | #WR | | 3 | #MREQ | 4 | #RD | | 5 | #M8-B (#EXM1) | 6 | Address 14 | | 7 | Address 13 | 8 | Address 8 | | 9 | Address 9 | 10 | Address 11 | | 11 | #M0-7 (#EXM2) | 12 | Address 10 | | 13 | #CE | 14 | Data 7 | | 15 | Data 6 | 16 | Data 5 | | 17 | Data 4 | 18 | Data 3 | | 19 | GND | 20 | GND | | 21 | GND | 22 | Data 2 | | 23 | Data 1 | 24 | Data 0 | | 25 | Address 0 | 26 | Address 1 | | 27 | Address 2 | 28 | Address 3 | | 29 | Address 4 | 30 | Address 5 | | 31 | Address 6 | 32 | Address 7 | | 33 | Address 12 | 34 | #CONT | | 35 | +5V | 36 | Address 15 | | 37 | #M1 | 38 | #IORQ | | 39 | #RFSH | 40 | #HALT | | 41 | #WAIT | 42 | #INT | | 43 | #KILLGA | 44 | #BUSRQ | | 45 | #BUSAK | 46 | #RST | | 47 | CLK | 48 | #KBSEL | | 49 | #CSRAM | 50 | #NMI |
Card Port PinoutThe Card Port found on the front of the Sega Master System is numbered left to right, odd numbers on the bottom row and even numbers on the top row. Sega Cards are credit card sized and are 0.093" thick PCB. Each row has a pin to pin spacing of 0.100" with the upper row being offset by 0.050". | Pin # | Description | Pin # | Description | | 1 | +5V | 2 | #WR | | 3 | #MREQ | 4 | #RD | | 5 | #M8-B (#EXM1) | 6 | Address 14 | | 7 | Address 13 | 8 | Address 8 | | 9 | Address 9 | 10 | Address 11 | | 11 | #M0-7 (#EXM2) | 12 | Address 10 | | 13 | #CE | 14 | Data 7 | | 15 | Data 6 | 16 | Data 5 | | 17 | Data 4 | 18 | Data 3 | | 19 | GND | 20 | GND | | 21 | GND | 22 | Data 2 | | 23 | Data 1 | 24 | Data 0 | | 25 | Address 0 | 26 | Address 1 | | 27 | Address 2 | 28 | Address 3 | | 29 | Address 4 | 30 | Address 5 | | 31 | Address 6 | 32 | Address 7 | | 33 | Address 12 | 34 | #CONT | | 35 | +5V | | |
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