Using ZX Basic to create ESXDOS dot commands

[britlion]

I suspect the issue is that you're writing these to fit into 8K of RAM starting at address 8192. There's nothing wrong with that, per-se, but when these are running, the ZX Spectrum ROM is not available - it normally lives in that 0-16383 address space. ZX Basic often uses bits of the Spectrum ROM, and if you use any code that hops into the ROM when the ROM isn't actually there, you're going to get into trouble quite quickly....