That is as i remember it, but I didn't recall the numbers.  Been a long 
time since I had a 440.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Tue, 28 Feb 2012, Mike Duke, K5XU wrote:

> Whoever said that the two chips installed in the radio only send a TTL
> signal to the DIN jack was correct.
>
> One of the chips is a Ne4040, the other, I think, is an 8281.
>
> If you are looking for that chip set, you can confirm those numbers
> with numerous TS440 modification sites.
>
> If someone is looking for them, I have a spare set of them somewhere,
> since I bought multiple sets from Jameco in the early 90's rather than
> buy one from Kenwood at double the price plus shipping.
>
> To use the TS440 with a computer, you will also need the TTL to RS232
> interface from Kenwood that was mentioned earlier, or you will need to
> find an alternative circuit. I think I remember seeing one
> specifically for the 440 a long time ago in QST, but I may be
> mistaken.
>
>
>
> Mike Duke, K5XU
> American Council of Blind Radio Amateurs
>
>