Pr0f wrote:You should be able to use both - there are 2 ROM sockets in the QL - both are wired exactly the same, so you could put the QL-SD in the right hand one as you look at the front, and the rom switcher in the left socket.
The QL-SD comes with its own minerva rom. If you want to use your ROM switcher, you must order the QL-SD version with the provision to switch off the embedded ROM, not the version with the SPI interface.
Also, to fit the QL-SD in the right ROM socket, you have to bend a transistor. But it can be done. I am using the QL-SD in the right socket and an original minerva mk-II in the left socket.