Master System Expansion
From HwB
Available at Sega Master System.
Similar like Master System Cartridge.
[edit] 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
