[GreenKeys] The last of the Pasco 35 ASR photos .. for a while

[Jim Haynes]

That's a lot of boards, some of them very thinly populated.  Looks like
for that product Teletype was still using the somewhat standard 36 pin
connector with the edge pins on .156" centers.

That started out as a card with 15 edge pins.  Sometime in the early 1960s 
they decided they needed a larger card, so they went to the 36 pin design 
and had a card guide that could snap on to the middle of the connector to 
allow it to hold two 15-pin cards or one 36-pin card.  I was rather 
distressed that in the mid 1960s they were still using the original 
standards for line widths and component spacings, leading to very low 
density of parts on the boards. I see that by the time of ICs in the 1970s 
they had been forced to go to narrower lines and tighter spacings, but 
were still using the same edge connectors.