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I did this.

I built the hardware (Z80 SBC), wrote the OS (tiny single tasking Unix like UZI180), started to write an editor (like ed). Then I got distracted with something shiny and abandoned it.

Think I blew 200 hours on that and don't even have the source now.

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next time build first a source control system (and/or a snapshotting filesystem)

My host machine was MSDOS and this was before I was aware of things like VCS'. I still have the ROM and board so I could possibly disassemble it.

The actual loss was caused by a disk failure and an untested backup system (my bad)

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