dr25

For the older bipolar PROMs such as N82s191CN3 or CY7C291A, only READ support is important to me. PROGRAM support can be left out.
A general reference of these chips can be found here: http://www.andysarcade.de/data/e ... ts/xref_bp_prom.txt . Datasheets can be found online.

For MC68705 series, some information can be found at the following URLs:
https://seanriddle.com/mc6805p2.html
https://seanriddle.com/mc68705p5.html
https://github.com/SandboxElectronics/MC6805P2_clone

In general, READ support is most important. If PROGRAM support is initially left out, that is acceptable.