this is a long shot and I know this post was years ago but I have aquired a boxford 250 slant bed with internal bbc board, it has had a floppy fitted so I presume the roms on the board ar dead. There is a disk in the floppy drive and it tries to boot every time the machine is switched on then fails. Any help from anyone would be apreciated, maybe someone has the roms from a retrofit or softwear on 3.5 floppy. A circuit diagram would be a bonus in case I have to retrifit.
I did not keep any of the boards and I never had the software. That is why I changed to Mach3. I also did not know about boxford retro then.
My Machine was a later model as it had already been upgraded to run with a PC which did not help as I did not have the Boxford software.
If you do decide to upgrade your machine I have an unused Campbell breakout board and can probably give you all the information you need to upgrade.
Does your machine have the tool changer? Is the speed range changed by changing the belt on the pulleys.
My machine also had the pulleys removed and was fitted with a single speed pulley setup with the speed only controlled by the inverter drive.