Can I use TXB0104B bidirectional level shifters on the Intel 8085 NMOS CPU buses?
To allow automatic bidirectional translation, the TXB has deliberately weak output drivers to allow other devices to override its own outputs.

This means that the other device must be able to drive the signals with at least 2 mA (see the section "Input Driver Requirement" of the TXB datasheet).
However, the 8085 can drive a high signal only with 400 µA, and that at 2.4 V.

For this application, TXS shifters would be more appropriate. (The downside is that the pull-up resistors eat some current for each any signal that is low.)