It appears to be run on a 5 volt regulator and I see a popular (for the time) TTL to RS232 chip which means converting this to USB is a simple task with a board I already designed for a different project.
Would you be willing to upload or send me the schematic for the board?
I'm interested in seeing how you get the console to work since you obviously have more electronics experience than myself.
Let me see what I can do before I get too far into this. A lot of it is really going to depend on the current draw of the entire console, I have a feeling it can be run off of USB power as long as the user does not try to connect the keyboard or mouse. I probably won't get very far until next week, need to find my USB-rs232 adapter which I think I misplaced with a bunch of old Cisco gear.
FYI you can get the schematic for the USB to TTL serial from FTDI which is the chip I used for that other project. They will give you all the components needed to design a USB to TTL serial adapter. They have several styles, the one I was using was to make it as small as possible with normal surface mounted soldering techniques. They do have through hole components so could could maybe build one on perforated board.
We were able to get a series MK1 console to work in the current beta version.
It can be done.
It was not hard.
JWL put a cheap serial RS232 card into the new computer running Win 7 64bit,
Got 64 bit drivers from L/Works.
He had to play around a bit, but it is working fine.
I used it all day on Friday, just like the old days.
Hopefully John will post his experience on the forum soon.
So dust off your old consoles and start editing.