I have some microchannel cards for an IBM 6611, attached are some pictures. If any of this is not documented and there is an interest to document it I can take better pictures. I know what most of them are except a couble of those dual serial cards, they appear to be from before it was commercialized to 6611, from the final stage of nsfnet? they have different ID than the same looking cards that have the 6611 designation on them. Not sure.