On Mon, 5 Sep 2022, jim stephens wrote:
the 5100 has an external connector.  The floppy drive is a floor unit about

Yes, three Sub-D connectors. Two for the signals, one for power.

the size of three AT units upright, with two single density floppies in it. 

And that floppy drive (if you are thinking of the IBM 5114) does *not* work on the 5100. The 5100 simply has not the "driver" for it.
Is it possible that you are thinking of the IBM 5110 ?

And there was another connector on the back of the unit to daisy chain the printer.  This is the 5100 desktop unit.

You could only attach up to three IBM 5106 external tape drives and one 5103 printer at the end of the chain. There wasn't anything else AFAIK.

I've got one of the units with the integrated 8" floppies as well.

That is the IBM 5120 aka IBM 5110 model 3.

Christian

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