cr0sh:
I took a look around your site - man, I've always wanted to try my hand at something like your simple 6809 or Z80 (or CP/M!) projects, but the thing that stops me is not owning an EPROM burner (I've probably got all the chips, otherwise).
Just take a look at this little project: Maintenance - Wartungsmodus
It's still in development, but already able to write and read EEPROMs. There are also a lot of information about it in the 6502.org forum (6502.org • View topic - 28Cxxx EEPROM Programmer)
There is also a GIT repository meanwhile to have the sourcecode available for public: GitHub - mkeller0815/MEEPROMMER: EEPROM / EPROM programmer based on Arduino hardware