Por lo que he estado viendo con la descarga del emulador el registro de cambios no viene actualizado, puesto que aparece que la última versión
publicada fue la v1.91 del año 2013, momento en el cual parece ser que se quedó paralizado el desarrollo del emulador.
Viendo el registro de cambios en el repositorio de Github del autor, aparece que se continuó el desarrollo del emulador
con nuevas versiones en el año 2019.
Y en concreto la versión de PS2 se ha empezado a compilar con mejoras a partir de la versión v2.00 de julio de 2024.
La última versión es la v2.03 de este último mes.
Visto los registros de cambios supongo que sólo estará añadido en la versión de PS2 aquellas menciones específicas a la
versión de PS2, desconozco si el resto de cambios del desarrollo se habrán añadido a la versión de PS2.
No sé tampoco si estos cambios ya fueron incluidos en la versión del Picodrive que está integrada en el RetroArch de PS2.
Veo que se arreglaron los problemas de sonido específicos de la versión de PS2 lo cual ya es algo muy bueno comparado
con la versión v1.51b que tenemos portada desde hace mucho tiempo.
Este es el registro de cambios de las últimas versiones donde se ha compilado la versión de PS2, he resaltado en negrita los
cambios que se han hecho específicos para la versión de PS2:
v2.03 Latest
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PicoDrive release 2.03
Limited Changelog:
2.03:
added support for Pico keyboard (thanks
@qufb for supplying this, literally years ago. Mea maxima culpa!)
added support for SC-3000 keyboard and cassette drive
added configurable mapping for physical keyboard
added virtual keyboard for devices not having a physical keyboard
improved window handling
added window size option (mouse resizing is additionally available)
added uploading of libretro-linux-x86 build artifact (no official release, access to this via the action tab)
fix bug in libretro frontend for Pico pad handling (thanks
@theLilaQ)
fixes for PS2 vsync handling (thanks @fjtrujy; this is still not being perfect) fix a crash for MD when rendering in 2-cell VSRAM mode (thanks
@notaz for pointing this out)
more fixes for MD+ (for running Doom 32x Resurrection and Fusion)
fix for 32X screen rendering (for running Sonic Robo Blast 2)
fix handling of the 32X cycles UI option
other minor bug fixes and optimizations
Binaries for:
gph (gph gp2x, wiz, caanoo)
pandora
dge (ritmix rzx-50, dingoo a320, possibly other similar devices having a JZ4740/JZ4755 cpu running early opendingux (mips32 w/o fpu))
retrofw (rs97, possibly other similar devices having a JZ4760 cpu (mips32 w/ fpu))
gcw0
opendingux (rg280/350, gkd350h/gkdmini with stock firmware, possibly other similar devices having a JZ4770 or newer (mips32r2 w/ fpu))
miyoo
odbeta (JZ4770 (gcw0, rg280/350), JZ4760 (rg300, rs97, ldk, k3), JZ4725 (rg99) running the newer opendingux beta)
psp
ps2 windows (experimental, untested)
v2.02-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PicoDrive release 2.02
Limited Changelog:
2.02:
fixes for MSU and MD+ (for running Doom 32x Resurrection and Fusion)
minimal SMS 3D glasses support
updates to libretro common (apparently fixes some obscure bugs)
some CD fixes
fix a cartridge mapping bug for ARM32 (cyclone)
fixes for 32X watchdog timer handling (for running Sonic Robo Blast 2, thanks
@notaz)
other minor bug fixes
Binaries for:
gph (gph gp2x, wiz, caanoo)
pandora
dge (ritmix rzx-50, dingoo a320, possibly other similar devices having a JZ4740/JZ4755 cpu running early opendingux (mips32 w/o fpu))
retrofw (rs97, possibly other similar devices having a JZ4760 cpu (mips32 w/ fpu))
gcw0
opendingux (rg280/350, gkd350h/gkdmini with stock firmware, possibly other similar devices having a JZ4770 or newer (mips32r2 w/ fpu))
miyoo
odbeta (JZ4770 (gcw0, rg280/350), JZ4760 (rg300, rs97, ldk, k3), JZ4725 (rg99) running the newer opendingux beta)
psp
ps2 windows (experimental, untested)
v2.01-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PicoDrive release 2.01
Update: for running Doom 32X Fusion use the CI version from here
Limited Changelog:
2.01:
added windows build
added integer scaling for SDL window mode
added support for mode 1
added support for MD+/32X+
improved CD emulation compatibility
added support for J-cart games (with 2 additional on-cart controller ports)
added some more mappings for Mega Drive games
added PS2 support for multitap and up to 4 controllers fixes for PS2 and PSP (audio, menu) other bug fixes
Binaries for:
gph (gph gp2x, wiz, caanoo)
pandora
dge (ritmix rzx-50, dingoo a320, possibly other similar devices having a JZ4740/JZ4755 cpu running early opendingux (mips32 w/o fpu))
retrofw (rs97, possibly other similar devices having a JZ4760 cpu (mips32 w/ fpu))
gcw0
opendingux (rg280/350, gkd350h/gkdmini with stock firmware, possibly other similar devices having a JZ4770 or newer (mips32r2 w/ fpu))
miyoo
odbeta (JZ4770 (gcw0, rg280/350), JZ4760 (rg300, rs97, ldk, k3), JZ4725 (rg99) running the newer opendingux beta)
psp
ps2 windows (experimental, untested)
v2.00-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PicoDrive release 2.00
Update: experimental Windows build added, feedback welcome
this is not going to be well maintained though, I don't even have a Windows system for testing.
Update: replaced PS2 binary to fix audio problems with sound rates lower than 44100Limited Changelog:
2.00:
improved system detection by extension
improved save/load (Z80, VDP state)
improved some auto mappings for SMS
added stereo for YM2612 DAC output
updated libchdr for zstd support
fixes for pandora
changed miyoo build to ipk
switched miyoo menu key to RESET
added some more MD cartridges
added more keys for some opendingux devices
several fixes for SH2 DRC
several VDP rendering fixes
a lot of other bug fixes (32X reset, Z80 timing, etc.)
2.00-beta3:
bug fixes (VDP reset, Z80 reset)
improvements for Sega/Mega CD
2.00-beta2:
substantial overhaul of Sega Pico UI:
supports png images for pad overlays and storyware, new hotkeys, new option (see below)
improved z80 and 68k timing for md and alike
improved timing for 68k access to z80 bus
improved 68k open bus read
implemented "busy" status bit in ym2612
fixes for big endian CPUs for state save/load
2.00-beta1:
added ps2 standalone target (thanks to fjtrujy for the fundamentals) improved psp support
fixed menu RGB/BGR handling
fixed several Z80 related timing inaccuracies
slightly increased volume for CD audio
other bug fixes
2.00-alpha3:
improved pandora layer handling
added handling of "fantom bitmap" (DMA to background color)
added SMS option to select TMS bitmap for legacy gfx modes
added stereo sound support for GG
overall revision of Pico support (correct sound, better handling of pen, better save/load handling)
2.00-alpha1+2:
improved MD FM sound (DAC ladder effect/clipping, filtering, native rate)
added support for 32X using MD H32 mode
added support for MSU-MD (cartridge+audio CD for MD and 32X)
added basic MD multiplayer support (team player, 4-way play)
added mapping for some additional Mega Drive games
added support for both Overdrive demos
improved save/load handling (SVP, MD mapping, MCD/32X cycle counter)
added more mappers for SMS cartridges
added some support for GG cartridges running in SMS mode
improved SMS graphics if 1st column is blanked
added missing TMS9918 modes
added SG-1000/SC-3000 support (no kbd yet, upcoming)
added additional handhelds/host systems (miyoo, gkd, rg99, odbeta)
improved handling of files by extension
revised menu (more consistent options handling, option profiles)
added dynarec support for PS3 using libretro
add CI to repo (including artifact uploading for the curious)
improved psp support
revived pandora support
a plethora of bug fixes and minor improvements (also most probably new bugs

)
Sega Pico support
The Pico support has undergone large changes and has been vastly improved. Specifically, images in png format for pad overlays
and storyware pages are now supported, pen support has improved a lot, hotkeys have changed to reflect these changes, and
ADPCM audio has been rewritten. IMHO it should now be much closer to the real thing than before.
There are now 2 hotkeys for changing display and input to storyware or pad. If there are images for either, they are automatically
loaded and displayed.
There's also an additional hotkey for the pen state to denote the pen being on the surface or not, indicated by the pointer icon being changed.
See platform/base_readme.txt for details on how to name the images.
Binaries for:
gph (gph gp2x, wiz, caanoo)
pandora
dge (ritmix rzx-50, dingoo a320, possibly other similar devices having a JZ4740/JZ4755 cpu running early opendingux (mips32 w/o fpu))
retrofw (rs97, possibly other similar devices having a JZ4760 cpu (mips32 w/ fpu))
gcw0
opendingux (rg280/350, gkd350h/gkdmini with stock firmware, possibly other similar devices having a JZ4770 or newer (mips32r2 w/ fpu))
miyoo
odbeta (JZ4770 (gcw0, rg280/350), JZ4760 (rg300, rs97, ldk, k3), JZ4725 (rg99) running the newer opendingux beta)
psp
ps2-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
He incluido en el hilo parte de esta información y el enlace del repositorio de Github, además de la descarga de la última
versión del emulador v2.03.
Saludos.