OPENOUT or OPENUP are not creating or writing to files

[NicholasPratt]

Only tested so far on the emulator but can't get OPENOUT or OPENUP to create or write to files

[breakintoprogram]

This was caused by an optimisation in Z80 that relied upon the fact that LD HL, nn has a 2-byte operand, not 3 bytes.

[NicholasPratt]

That was quick :)