Spectrum resets

[boriel]

I was programming the same game and the speccy resets, is there a way of telling which line it crashes on?

(except commenting out loads of lines)

It the spectrum resets there's very little to do at the moment (I was thinking on an emulator).
However, use zxb --help and look for memory checks, array checks and break on and others. Usually many error are reported using the ZX Spectrum ROM Error routine. That is, if you see something like:
345:0 Subscript out of range, sometimes it refers to the REAL 345 line (I can't recall if I implemented this really). Anyway use this only for debugging: it will slow down your program and takes more memory.