[sokoloff]

> From memory it switched between the roms by switching out the leg that had power going to it,

Somewhat more likely that it had constant power and ground to all chips and switched the output-enable pin on the EPROM you wanted to be active. (Many chips are not spec’d to have inputs driven many volts above the power input level, hence the output-enable/chip-select pins.)

I also look back to projects that taxed my abilities at the time (software and hardware) that I wouldn’t even notice as being part of the project now. I’m only reminded when I see my kids come up that similar curve.

[smackeyacky]

That does sound more likely. There was a rotary switch on that single line to the eproms, but the kit did come with a warning you shouldn't switch them while the computer was running. Was certainly a lot easier than levering out your expensive eprom. In retrospect it was a stupid way to distribute software, but the microbee couldn't fit the word processor and assembler in memory at the same time.