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

[Pete Lancashire]

Actually just 7 boards, did photos with and without the flash and at
different angles.

-pete

On Mon, Aug 10, 2015 at 12:04 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> 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.
>
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