A call for OSI docs/New toy

The Challenger iii saga continues... Yep, one of the 470's does indeed have a line of pins where a daughter card might have plugged in. Will the 510's rom let me go without a daughter&disk attached? If not, is a new one buildable? OSI 470 -- Believe it or not, can be configured to do either parallel or floppy and a few other "network-like" things as well. Note that in any case, most of the board is unpopulated. If it is being used as a floppy controller, there should be a small "daughter" card hanging off of it and the cable to the floppy drive will come from that card (can't remember the OSI number for that card). The floppy may have been disconnected by removing this card, in which case there will just be a row of pins sticking out. I don't have those schematics here at work right now. I'll try to remember to bring them in tomorrow to give you more details. Assuming the serial port on the 510 is populated and enabled, then you should have a complete system with the addition of a terminal, floppy drive and system (OS-65D). If not, then you would need to add an early rev (pre-B) 540 board to give you video, keyboard and cassette. You would also need an OSI 542 keyboard. The ROMs on the 510 will be programmed to expect a certain configuration, so if the serial port is not there, filling it in will not help. The 510 is wired out to a 5-pin female din mounted on the back of the OSI's case. Tell me this is its serial port, and also tell me the pin outs. ;) And... any idea how many of these were sold? This one seems to have a pretty low serial number... Thanks - Mike