Master System Cartridge

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Available at Sega Master System, Master System II and Game Gear (with SMS adapter).

Same pinout also for Master System Expansion port.

Pinout (European)

Front 2           50
      ==============	(at Cartridge)
Back  1           49

Cartridge
Back  39           1
      ==============	(at Console)
Front 50           2

Pin	Dir	Name	Description
1		+5V	Power +5V
2	?	/WR	Write
3	?	/MREQ	Memory Request
4	?	/RD	Read
5	?	/EXM1	Memory 8000-BFFF
6		A14	Address bit14
7		A13	Address bit13
8		A8	Address bit8
9		A9	Address bit9
10		A11	Address bit11
11	?	/EXM2	Memory 0000-7FFF
12		A10	Address bit10
13	?	/CE	Cartridge Output Enable
14		D7	Data bit7
15		D6	Data bit6
16		D5	Data bit5
17		D4	Data bit4
18		D3	Data bit3
19		GND	Ground
20		GND	Ground
21		GND	Ground
22		D2	Data bit2
23		D1	Data bit1
24		D0	Data bit0
25		A0	Address bit0
26		A1	Address bit1
27		A2	Address bit2
28		A3	Address bit3
29		A4	Address bit4
30		A5	Address bit5
31		A6	Address bit6
32		A7	Address bit7
33		A12	Address bit12
34	?	CONT	?
35		+5V	Power +5V
36		A15	Address bit15
37	?	/M1	?
38	?	/IORQ	I/O Request
39	?	/RFSH	Refresh
40	?	/HALT	Halt
41	?	/WAIT	Wait
42	?	/INT	Interrupt
43	?	JyDs	(also known as /KILLGA)
44	?	/BUSRQ	Bus request
45	?	/BUSAK	Bus request acknowledge
46	?	/RST	Reset
47	?	CLK	Clock
48	?	/KBSEL	?
49	?	/CSRAM	Memory C000-FFFF
50	?	/NMI	Non Maskable Interrupt

Note: Direction is Console relative Cartridge

Pinout (Japanese)

Front B1 B22

     ======================  (at Cartridge)

Back A1 A22

     ======================  (at Console)

Front B1 B22

Is this same as SG-1000 & SG-1000 Mark II connectors?

Pin	Dir	Name	Description
A1		A0	Address bit0
A2		A1	Address bit1
A3		A2	Address bit2
A4		A3	Address bit3
A5		A4	Address bit4
A6		A5	Address bit5
A7		A6	Address bit6
A8		A7	Address bit7
A9		A8	Address bit8
A10		A9	Address bit9
A11		A10	Address bit10
A12		A11	Address bit11
A13		A12	Address bit12
A14		A13	Address bit13
A15		D0	Data bit0
A16		D1	Data bit1
A17		D2	Data bit2
A18		D3	Data bit3
A19		D4	Data bit4
A20		D5	Data bit5
A21		D6	Data bit6
A22		D7	Data bit7
B1		+5V	Power +5V
B2		/CSCN4	Power +5V
B3	?	/CSRAM	?
B4	?	/EXM1	Memory 8000-BFFF
B5	?	/RD	Read
B6	?	/WR	Write
B7	?	/IORD	I/O Read
B8	?	/IOWR	I/O Write
B9	?	/RFSH	Refresh
B10	?	/MREQ	? Cartridge Output Enable
B11	?	/CONT	?
B12	?	/RAS0	?
B13	?	/CAS0	?
B14	?	CA7	?
B15	?	/RAS1	?
B16	?	/CAS1	?
B17	?	/RCSEL	?
B18		A14	Address bit14
B19		A15	Address bit15
B20	?	/EXM2	Memory 0000-7FFF ?
B21		GND	Ground
B22		GND	Ground

Note: Direction is Console relative Cartridge

Compatibility

Note:

Japanese and South Korean consoles use 44-pin cartridges, same shape as Mark I and Mark II
All other consoles use 50-pin cartridges with a different shape
The difference in cartridge style is a form of regional lockout

Cartridges were originally used for game of higher capacity than 256Kb (32KB), smaller ones were stored on cards.

When the Master System II arrived (without a card input), some Card games have been converted to cartridges.

Cartridges bigger than 512Kb (64KB) cannot be used with the 16 address bits and must use FCRs (Frame Control Registers, a bank switching method).

Because cards only have 15 address bits (while cartridges have all the 16 bits) and don't use bank switching, they are limited to 256Kb (32KB), cartridges are used for higher capacities.

Sources