Finding out which GPIO is on which pin

a Pi 1 rev 2 and using RISC OS and having soldered something into the holes for P5

I’m at work… Is that the little square four pin socket at the inside end of the regular GPIO? If so, my Pi 1 came with that already fitted on the board.

Is that the little square four pin socket at the inside end of the regular GPIO?

It’s a 4×2 header at the bottom left corner(ish) of the GPIO header (only present on Pi1 Rev.2):

That looks like a mistake in the tables, you must be the only person in the Venn diagram of using a Pi 1 rev 2 and using RISC OS and having soldered something into the holes for P5. I’ve proposed a fix marking those as usable.

Thanks for the bug fix. It’s not really important whether I’m using them or not (I might be!), more that if they’re there, they should be exposed. Maybe any others using them are still using Tank’s version of the GPIO module!

It’s a 4×2 header at the bottom left corner(ish)

Oh, that one. Thanks for the clarification. My Pi had that fitted too. I had to cut out a piece of plastic (from a blister wrap) because interfered with the CJE RTC (and, I’d imagine, anything like that that plugged into GPIO).