Check out 86Box[0], unlike Dosbox it does full system emulation and tries to be cycle accurate (or cycle accurate enough) so that you will notice little to no discrepancies between the emulated hardware and the real one.
86Box was forked from PCem which is kinda similar but PCem development has practically stopped and all development nowadays goes towards 86Box.
Also FWIW do not use plain Dosbox, it has longstanding bugs that haven't been fixed in years (some have been fixed in SVN but they haven't made a new major release for a very long time). Use Dosbox-X or at least Dosbox Staging instead (Dosbos-X is more accurate). As an example Post Apocalyptic Petra[1], a game i made ~3 years ago for a DOS game jam doesn't work on plain Dosbox because of some timing issues (you may get a black screen or visual glitches) - you need either Dosbox-X or Dosbox Staging.
Also note that these projects have slightly different goals: 86Box tries to emulate the hardware as precisely as it can whereas Dosbox(-X/Staging/etc) tries to provide a compatibility layer for running older software (plain Dosbox is only focused on games but other forks expand that to include all software). This means that Dosbox(/etc) will be more likely to ignore "bad" programming that wouldn't work on (or only work on some) real hardware - e.g. its Sound Blaster emulation is very forgiving and if you write some SB code and test it only on Dosbox chances are it wont work on the real hardware.
86Box was forked from PCem which is kinda similar but PCem development has practically stopped and all development nowadays goes towards 86Box.
Also FWIW do not use plain Dosbox, it has longstanding bugs that haven't been fixed in years (some have been fixed in SVN but they haven't made a new major release for a very long time). Use Dosbox-X or at least Dosbox Staging instead (Dosbos-X is more accurate). As an example Post Apocalyptic Petra[1], a game i made ~3 years ago for a DOS game jam doesn't work on plain Dosbox because of some timing issues (you may get a black screen or visual glitches) - you need either Dosbox-X or Dosbox Staging.
Also note that these projects have slightly different goals: 86Box tries to emulate the hardware as precisely as it can whereas Dosbox(-X/Staging/etc) tries to provide a compatibility layer for running older software (plain Dosbox is only focused on games but other forks expand that to include all software). This means that Dosbox(/etc) will be more likely to ignore "bad" programming that wouldn't work on (or only work on some) real hardware - e.g. its Sound Blaster emulation is very forgiving and if you write some SB code and test it only on Dosbox chances are it wont work on the real hardware.
[0] https://86box.net/
[1] https://bad-sector.itch.io/post-apocalyptic-petra