I was trying to get the PC compatibility card (a Gemini II) in my Risc PC (StrongARM, running RISC OS 3.70) onto the network. However, when starting the emulated PC, I would get a “Not a heap block” error, and the emulated PC wouldn’t have its emulated network card.
It turns out this is because the program it invokes to find the most appropriate interface (this is called ScanDCI4) doesn’t actually work. This causes the script to fail, and not actually load the emulated NE2000 support module. To fix this, we’ll need to patch the script that starts the PC card networking support.