27 Feb
2020
27 Feb
'20
4:41 p.m.
On Feb 27, 2020, at 7:20 PM, Nigel Johnson via cctalk
<cctalk at classiccmp.org> wrote:
If your reference to D-sub means the connectors originally made by ITT-Cannon, I can
offer the following from a cutout from a trade catalog that I have carried around these
last 30 years as ammunition against those who erroneously use the term DB-9!
I wasn't sure, so I had to find it and can confirm that there was no
'standard' D-sub of 52 pins in 3 rows. The ones available were:
DA15, DB25, DC37, and DD50, that latter of which had 50 pins in three rows. There was of
course the famously mis-labelled DE9.
I didn't realize DD50 isn't two rows. Interesting.
Ok, https://en.wikipedia.org/wiki/D-subminiature has more. Apparently there are three
flavors: normal density (2 rows except for DD), high density (3 rows except for DD which
has four) and "double density" -- like high density but with more pins in each
row.
And the table shows Adam's connector, a DB-52 in the double density series.
paul