I think to use software already written, I thought I
connect the GPIO pins on the free Ospi 1.4
but in the ‘latest version V1.4 RPI GPIO pins
are directly connected on the board OSPI
in previous versions was the connection cable
All RPi GPIO pins are mapped out in the ‘RPi Pin Out’ area. It’s at the upper-left corner of the board. The user manual has annotated diagrams to show where they are: http://rayshobby.net/docs/ospi14_manual.pdf
the pin names are not labeled (because there is no space to label them), but you should see the leftmost two pins are marked +5V and 3.3V, so you can use those two pins to figure out the name of the remaining pins.
I apologize that the details are not provided in the user manual yet. I should add them soon. OSPi 1.4 uses the first 8 pins on the 3.3V column (same as the 8 pins you see in the picture you attached), and the first 5 pins on the 5V column. On the circuit board you can see that the occupied pins are surrounded by a white box in the silkscreen. They are pretty subtle but should be visible. The other pins are free to use. Also, the SDA/SCL pins (which OSPi 1.4 uses for RTC and ADC) can be shared with other devices.