These files are an attempt to put the font used by the DOS version of Angband 2.9.6 in a form usable with Angband 4.2's frontends for Windows or SDL. See LICENSE.txt for the licensing details.
8x16retro.fon is a conversion of Angband 2.9.6's LIB/XTRA/ANGBAND.FNT. It was generated using tools from psftools-1.0.13 (from http://www.seasip.info/Unix/PSF/ ) as follows:
raw2psf --height=16 --codepage=CP1252 ANGBAND.FNT > 8x16retro.psf
psf2fnt 8x16retro.psf 8x16retro.fnt
fnts2fon 8x16retro.fnt 8x16retro.fon --winver=3.0
To use 8x16retro.fon with Angband 4.2, copy it to the lib/fonts directory of the game's files.
retro.prf overrides the defaults for showing some objects and terrain features in Angband 4.2 to try to match the mapping set up by Angband 2.9.6's LIB/XTRA/GREDIT.INI. To try out those preferences with Angband 4.2.0, put retro.prf in the directory for Angband's user preferences (~/.angband/Angband on Linux) and, when running Angband, load them via the '=' command's "Load a user pref file" option. For regular use, you'll have to configure your preferences so retro.prf is automatically loaded.