Master System Expansion
From HwB
Available at Sega Master System.
Similar like Master System Cartridge.
Pinout
Upper 1 49
============== (at Console)
Lower 2 50
| 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 Expansion device
