sorry i didn't answer earlier. i've been traveling all day.

first there is no such thing as 70-pin scsi cable.

there are 25, 50, 68 and 80.

you don't have to worry about 68 or 80.

from the picture you posted, it looks like a 25 to 50 pin cable.

SCSI I/II/III doesn't have anything to do with the pin numbers of the cable or the connector type.

to answer your question see above. there are different types of SCSI II cards, remember those are just standards for transmission of signals with many variations on the physical connector types.

the scanner should say SCSI II 50pin high density or low density connector.
it maybe even be a 68pin but I doubt it, as those type usually cost close to $1k.

high density 50-pin external connector looks like the one on the left (on the pic you posted), a low density 50 aka centronics looks like the old printer cable.

let me know if you have any other question. i'm gonna crash now. it's nearly 4am