DEC bus transceivers

Al Kossow aek at
Sun Oct 23 13:59:46 CDT 2016

On 10/23/16 11:50 AM, shadoooo wrote:

> The problem is that there aren't open drain bus transceivers, but the
> problem could be solved simply using input-only and output-only components,
> connecting two in parallel but opposite direction on bidirectional pins.

The reason for using the old parts is the logic thresholds are unique to
the Unibus to handle worst-case bus loading and the termination voltage they

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