The latter are individual socket pins that fit into a 1mm hole and allow you to mount the eprom at board level without using the extra height of a socket, which hopefully means the board will just about fit inside the case.
They have two problems though, they are expensive & fiddly to fit, so it would be good to find an alternative. As I have been working on a board that combines a QIMI (with PS/2 interface) and Minerva addon into one board, and so needs 68 of those pins (for the ZX8302 & EPROM)
which you plug deeply into oversized drill holes. With most PCB manufacturing specs these days, the copper rest ring should still be sufficient.
For the QL-SD, I didn't do that, because I wanted a strict ground plane, an the one remaining layer didn't leave me enough routing space in case of larger holes. However, the QL-SD ground plane was more for aesthetic reasons, than being of real use. The layout of the QL mainboard is so much worse anyway.
I use the turned DIL sockets too. They are super-easy to fit. You can also buy the turned pins loose - not in the plastic carrier. If you position them in a turned socket and use it as a jig, you can surface mount them too.
If you're having a PCB house make them, 1.4mm diameter holes work. If you're doing it yourself, make the whole really tiny, so it acts as a pilot for your drill bit
Dave wrote:I use the turned DIL sockets too. They are super-easy to fit. You can also buy the turned pins loose - not in the plastic carrier.
You can? do you have a link for that as it may be much cheaper
If you position them in a turned socket and use it as a jig, you can surface mount them too.
If you're having a PCB house make them, 1.4mm diameter holes work. If you're doing it yourself, make the whole really tiny, so it acts as a pilot for your drill bit
I have surface mounted them before in a stripboard when I made my fist Minerva board,but having to strip them out of the socket was a pain
(for the ZX8302 & EPROM) 
