48 lines
2.2 KiB
Markdown
48 lines
2.2 KiB
Markdown
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# Expansion Port
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Sentinel 65X features an expansion port along one side of the mainboard PCB. This port, a male edge connnector, exposes the same pins as the [cartridge port](Cartridge Port.md), and is intended to connect to a buffered backplane accessory. The port also features test points for all the signals on the port.
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As with the cartridge port, the expansion port exposes the full system bus, as well as several chip select signals which simplify the development of expansions.
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## Pinout
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| Pin | Label | | Label | Pin |
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| :---: | :--------: | --- | :--------: | :---: |
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| b1 | PHI2 | | GND | a1 |
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| b2 | /RES | | +3.3V | a2 |
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| b3 | A0 | | A1 | a3 |
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| b4 | A2 | | A3 | a4 |
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| b5 | A4 | | A5 | a5 |
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| b6 | A6 | | A7 | a6 |
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| b7 | A8 | | A9 | a7 |
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| b8 | A10 | | A11 | a8 |
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| b9 | A12 | | A13 | a9 |
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| b10 | A14 | | A15 | a10 |
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| b11 | A16 | | A17 | a11 |
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| b12 | A18 | | A19 | a12 |
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| b13 | A20 | | A21 | a13 |
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| b14 | A22 | | A23 | a14 |
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| b15 | D0 | | D1 | a15 |
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| b16 | D2 | | D3 | a16 |
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| b17 | D4 | | D5 | a17 |
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| b18 | D6 | | GND | a18 |
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| b19 | D7 | | /WR | a19 |
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| b20 | /RD | | /RAM1 | a20 |
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| b21 | /ROM1 | | BE | a21 |
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| b22 | /CS6 | | /CS7 | a22 |
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| b23 | /CS1 | | RUN | a23 |
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| b24 | BA | | /IRQ | a24 |
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| b25 | R/W | | /VIRQ | a25 |
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| b26 | /CS0 | | /NMI | a26 |
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| b27 | SNES_DATA0 | | SCL | a27 |
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| b28 | SNES_DATA1 | | SDA | a28 |
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| b29 | SNES_DATA2 | | SNES_LATCH | a29 |
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| b30 | SNES_DATA3 | | SNES_CLK | a30 |
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| b31 | /CART | | +3.3V | a31 |
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| b32 | +5V | | GND | a32 |
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