LEAST valuable collectibles (was: Apple II boards

Cartridge? What cartridge. The Sanders 12/7 ribbon is wound onto a plastic hub (it's not even a spool, there are no flanges). You put this hub onto a spool on the right side of the printer and clamp a flange over it. There's a leaf spring to provide a little backtension here. You then run the ribbon round a guide roller, across the front of the printhead, around another guide roller, around the ribbon motion sensor (a roller with a slotted optoswitch) and onto an empty hub between a pair of flanges mounted on a small mains motor. After printing a row of dots, the AC motor is turned on (there's a solid state relay on the backplane) until the appropriate amount of ribbon has been wound on. If the ribbon sensor detects no movement, the printer assumes the ribbon has run out and gives the appropriate error. I think, BTW, the amount of ribbon used can be set under program control, but that might only be on the later Sanders 700 machines The latter use a Diablo 630 print mechanism, but with a dot matrix head in place of the daisywheel. The ribbon is a conventional Diablo 630 type of cartridge with a stepper motor to wind it on. -tony