The core is replaced by dosbox-core as of libretro/dosbox-core d38fcb50 (its
history is in that repository), with the following on top:
- Frontend VFS for mounted drives (libretro/dosbox-core#11): Android content://
and saf:// content works.
- Built as dosbox_libretro and called DOSBox, so it installs next to
dosbox-core without sharing its options, saves directory or config file.
Option keys keep their dosbox_core_ prefix.
- ZIP files as content, from DOSBox Pure (Bernhard Schelling): its zipDrive,
unionDrive and memoryDrive, and the helpers they share (drive_dbp.cpp). The
archive is mounted as C: without being extracted and the game's changes go
to <name>.save.zip in the saves directory. DOS_Drive and DOS_File get the
few members those drives need, with defaults.
- The game in a ZIP is started when there is nothing to choose: the single
program in the root, or in the one folder the root holds, leaving setup and
install programs aside.
- Disk images inside a ZIP: CD images (cue sheets with data and audio tracks,
or ISOs) as D:, floppy images as A:, hard disk images as E: and on. Files on
emulated drives can be named "$C:\PATH" as in DOSBox Pure; host_stat,
fopen_wrap, the CD image reader and the audio track decoder open them
through the drive, finding files by their long names. CDs and floppies go
to RetroArch's disc control.
- A start menu after DOSBox Pure's when a ZIP leaves a choice: it lists the
programs on C: and on the mounted images, starts the one picked, can make it
start on its own next time (kept in C:\DOSBOX.RUN, in the save file), and
comes back when the program exits. Keyboard and gamepad; it can be turned
off in the core options.
- Automatic gamepad mapping from DOSBox Pure's Keyb2Joypad database (original
data by Jemy Murphy and bigjim, used by DOSBox Pure with permission): a game
the database knows, as a ZIP or from a directory, gets its keys, mouse and
joystick actions on the first gamepad instead of the DOS joystick, with the
action names shown in RetroArch. It can be turned off.
- The CPU speed from the game's year, from its name or the database, as in
DOSBox Pure; it can be turned off.
- Roland SC-55 MIDI with Nuked-SC55 (nukeykt), from DOSBox Pure, as a new MIDI
driver taking the module's ROMs from the system directory.
WizzardSK