I’ve just discovered a fantastic retro games development tool… Up until now I’ve been using the Z80ASM assembler by Peter Hanratty and ZX Spectrum Emulator by Vaggelis Kapartzianis; both excellent applications in their own right, but still lacking somewhat. The assembler did not appear to support operand arithmetic, so I could not do this: LD (SOMELABEL+1),HL … SOMELABEL: LD HL,0 Which is a beggar, as I often use self modifying code and being able to access memory a …