TI-92 Expansion Port Pinouts

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|NC   |CE1/ |D3   |D2   |D1   |D0   |GND  |A1   |A3   |A5   |A7   |A18  |NC   |
|     |RAM  |     |     |     |     |     |     |     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|Vcc  |RW/  |D11  |D10  |D9   |D8   |GND  |*    |A2   |A4   |A6   |A8   |A19  |
|RAM  |     |     |     |     |     |     |     |     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+




+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|Vcc  |     |Vcc  |D12  |D13  |D14  |D15  |Vcc  |A16  |A14  |A12  |A10  |A20  |
|RAM  |     |ROM  |     |     |     |     |ROM  |     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|NC   |CE2/ |D4   |D5   |D6   |D7   |GND  |A17  |A15  |A13  |A11  |A9   |NC   |
|     |RAM  |     |     |     |     |     |     |     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

* CE/ ROM:      accesses 400000-5FFFFF on models with internal ROM,
                accesses 200000-5FFFFF on models with no internal ROM