Now, soldering is always a better connection, but those clippy things are pretty reliable..
Back in the day I found that using the clips allowed oxidisation which made it very unstable. I soldered the wires to a row of pin headers that then sat between gary and the motherboard.
IIRC on mine it was 4 wires as there was 2mb on the megachip board which was used for all the chip ram, the motherboard chip ram was unused and the 512k ranger memory (if configured) was still there. I need to test it still works as I'm likely to sell it soon.
