brew-your-own-unibus boards?

From: Brad Parker <>
Date: Tue Jan 20 05:12:29 2004

der Mouse wrote:
>>From the looks of it, for a driver you can use almost any
>open-collector TTL output - at least, a quick look at the specs doesn't
>reveal anything that stands out as incompatible.
>The receivers are a bit more interesting. The spec says that their
>threshold must be between 1.3 and 1.7 volts and that their high-level
>input current must be no greater than 80ľA; it fails to give any limits
>on how much current they source into a low-level input, though there
>surely must be such a limit.

Looking at the DS3662 specs (now sadly obsolete), I'm wondering if the
DS3896 would work. I'm not comfortable driving the unibus with a stock
TTL output (hah, *which* ttl? :-) since I'd like the slew to be more
controlled (ok, slower). The "trapazoidal" drivers make for a nicer

I have not looked at QBUS specs (yet). I seems the drivers may be the same.
Is it terminated the same as a unibus?

Received on Tue Jan 20 2004 - 05:12:29 GMT

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