HP2748A papertape reader : connector ?

From: Jay West <west_at_tseinc.com>
Date: Sun Jul 1 05:28:15 2001

Bob Shannon wrote...
> > This is incorrect!
> >
> > The HP tape reader uses a HP tape reader board that is unique, it is NOT
the HP
> > 8 bit duplex register board.

Bob is incorrect for the 2100 as well as the entire 21MX M/E/F (and HP1000)
lines. He could very well be right on the 2114/5/6 cpu's though.

The HP 2748B paper tape readers were connected to an HP2100 or HP21MX M/E/F
system via the 8-bit duplex register board. No other interface was used, at
least for sale in HP configurations. Matter of fact, if you bought the paper
tape reader kit (the part # escapes my mind) which included the paper tape
reader, the HOST interface board, cables, manuals, and diagnostic, there was
only one interface you would ever get. The 8-bit duplex register. This was
the HP designated interface for the 2748B.

I can only assume Bob is referring to the older 2114 (not actually an HP
machine other than the label), 2115, and 2116 machines which I'm not as
familiar with. I have however, seen 2748B paper tape readers hooked up to a
2116 with an 8 bit duplex register so I know that to say in general terms
that the HP tape reader board is unique and not the 8 bit duplex register
board isn't accurate. But I can't speak from experience on the 2114 or 2115.
Of course, the 2114/5/6 are NOT 2100 machines, and of course they're not
21MX M/E/F systems either. So, perhaps early 2114/5/6's had a modified paper
tape reader and a unique interface at that time, but certainly not after the
2116.

Jay West
Received on Sun Jul 01 2001 - 05:28:15 BST