I have now moved from editing and assembling .zasm Z80 Assembler files using the custom-written zasm-cocoa app and I am now using BBEdit with a custom Z80 Assembler BBEdit Codeless Language Module plist
to use, put this .plist file
Z80 Assembler BBEdit Codeless Language Module.plist
in
~/Library/Application Support/BBEdit/Language Modules/ folder
zasm can be found here http://k1.dyndns.org/Develop/projects/zasm/distributions/
fuse zx spectrum emulator can be found here Fuse – the Free Unix Spectrum Emulator
