On Jul 6, 2014, at 21:36, Rick Murphy <rick at rickmurphy.net> wrote:
Looking at the datasheet, the 7439 has the same pinout and function as an 8881. I'm
convinced that this is at least as good a replacement as a 7401.
It's not at all unlikely that 8881s are just specially-binned
7439s in this case; that's consistent with what DEC did for
other transceiver chips sourced from major manufacturers.
- Dave