Ancient History question: 5668903A IAD20

[David Boyes]

Anybody recognize this product? I found a maintenance tape for it while sorting through the Princeton tape archives, but since the sales manual on IBMlink was lobotomized, the older product info appears to have vanished.   Pointers or info about it appreciated.   (COT: I’d forgotten what a royal PITA 9 track tapes are. Especially on a 3430 w/o autoloading. No wonder the 3480 was considered such a enormous improvement. )   David Boyes Sine Nomine Associates