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Most documentation say that most of the bits are normally set to 1 or 0, so just mentioning that in the comments. A.N.A.L.O.G. issue 59 (April 1988) "Bits & Pieces" column, "Atari Zucchini" (https://www.atarimagazines.com/analog/issue59/bits_pieces.php) implies that they are used for specific things, but it's not clear enough to be useful (or specifically states "Too complex and not pertinent"). This is probably sufficient for most purposes; if any PIA / PACTL/PBCTL experts pop up, they can tell us exactly how those 4 bits can be utilized.
cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.
cc65 has C and runtime library support for many of the old 6502 machines, including
- the following Commodore machines:
- VIC20
- C16/C116 and Plus/4
- C64
- C128
- CBM 510 (aka P500)
- the 600/700 family
- newer PET machines (not 2001).
- the Apple ][+ and successors.
- the Atari 8 bit machines.
- the Atari 2600 console.
- the Atari 5200 console.
- GEOS for the C64, C128 and Apple //e.
- the Bit Corporation Gamate console.
- the NEC PC-Engine (aka TurboGrafx-16) console.
- the Nintendo Entertainment System (NES) console.
- the Watara Supervision console.
- the VTech Creativision console.
- the Oric Atmos.
- the Oric Telestrat.
- the Lynx console.
- the Ohio Scientific Challenger 1P.
The libraries are fairly portable, so creating a version for other 6502s shouldn't be too much work.