v3.6.1

Virtual Jaguar libretro v3.6.1

A patch release for one thing: booting the core with no content now lands you
in the CD BIOS, which is the screen you insert a disc from.

v3.6.0 shipped no-content boot (#646) and the disk-control interface (#651) so
you could launch the core bare, put in a disc, and reach the Virtual Light
Machine with an audio CD. That combination did not work. This fixes it.

---

The fix

No-content boot resolved to a bare console: the boot ROM running against a
zeroed cartridge window. That is authentic for a Jaguar with no CD unit
attached — and it is a dead end. The CD BIOS is what offers "insert a disc",
and it is mapped as a cartridge at $800000, so nothing reachable from the
empty-slot screen could ever get to it. The headline feature of v3.6.0 was
unreachable by construction.

Starting with no content now boots the real CD BIOS, which comes up on its
own insert-disc screen. No files are required: an external CD BIOS ROM in your
system directory is preferred if you have one, and otherwise an embedded image
is used.

Two smaller consequences of the same path, fixed alongside:

• It reported cartridge mode rather than CD mode with an empty tray, which
  inverted the options menu against a machine sitting in the CD BIOS — CD Boot
  Mode and CD BIOS Type were hidden, and the cartridge-BIOS option was shown.
• The Memory Track cart plugs into the CD unit and is present whether or not
  a disc is, but it stayed absent until the first insert.

supports_no_game was never advertised

dist/info still said supports_no_game = "false" after
RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME shipped in v3.6.0. RetroArch reads the
info database, not the runtime environment call, to decide whether to offer
a contentless launch — so frontends were never told the core supports it. Now
"true".

If your frontend does not offer "Start Core" without content, its info file is
out of date; update it from the libretro info repository.

Why the tests did not catch this

Two tests asserted which boot strategy resolved and never checked what the
machine did with it, so a correctly-resolved dead end passed cleanly. Both now
pin the corrected behaviour.

One of them is worth noting for anyone reading the diff: test_disk_control
case 1 compared strategy names either side of a disc insert. With no-content now
resolving to "bios" — and a real-BIOS disc also resolving to "bios" — that
comparison would have gone vacuous, passing while asserting nothing. It now
pairs the strategy name with isCDGame, which is what actually moves: false for
the bare BIOS on its insert screen, true once a disc is mounted.

---

Upgrading

Nothing to do beyond installing the core. Savestates, per-title defaults, hooks
and cheats are unchanged from v3.6.0.

If you reported the v3.6.0 no-content boot as broken, check which core you
have installed. The original report for #726 was made against a v3.5.1 core —
a version that predates the feature entirely — which is worth ruling out before
anything else.

Known limitations

Unchanged from v3.6.0:

• Inserting a disc restarts the console. A continuous swap depends on CD BIOS
  disc-presence polling that has not been verified.
• The enhancement profile governs internal_resolution and true_color only.
• docs/WHATSNEW has no sections for v3.1.0 through v3.5.1; the per-release
  notes in docs/RELEASE_NOTES_v*.md are authoritative for those.

---

Artifacts in this release

SHA256SUMS.txt
cue2cdi-linux-x86_64
cue2cdi-macos-universal
cue2cdi-windows-x86_64.exe
jagcd-tools-linux-x64.zip
jagcd-tools-macos.zip
jagcd-tools-windows-x64.zip
virtualjaguar_libretro-android-arm64-v8a-debug.tar.gz
virtualjaguar_libretro-android-arm64-v8a.so
virtualjaguar_libretro-android-armeabi-v7a-debug.tar.gz
virtualjaguar_libretro-android-armeabi-v7a.so
virtualjaguar_libretro-android-x86-debug.tar.gz
virtualjaguar_libretro-android-x86.so
virtualjaguar_libretro-android-x86_64-debug.tar.gz
virtualjaguar_libretro-android-x86_64.so
virtualjaguar_libretro-emscripten-wasm-debug.tar.gz
virtualjaguar_libretro-emscripten-wasm.bc
virtualjaguar_libretro-ios-arm64-debug.tar.gz
virtualjaguar_libretro-ios-arm64.dylib
virtualjaguar_libretro-linux-aarch64-debug.tar.gz
virtualjaguar_libretro-linux-aarch64.so
virtualjaguar_libretro-linux-i686-debug.tar.gz
virtualjaguar_libretro-linux-i686.so
virtualjaguar_libretro-linux-rpi1-armv6-debug.tar.gz
virtualjaguar_libretro-linux-rpi1-armv6.so
virtualjaguar_libretro-linux-rpi2-cortex-a7-debug.tar.gz
virtualjaguar_libretro-linux-rpi2-cortex-a7.so
virtualjaguar_libretro-linux-rpi3-cortex-a53-debug.tar.gz
virtualjaguar_libretro-linux-rpi3-cortex-a53.so
virtualjaguar_libretro-linux-rpi3_64-cortex-a53-debug.tar.gz
virtualjaguar_libretro-linux-rpi3_64-cortex-a53.so
virtualjaguar_libretro-linux-rpi4-cortex-a72-debug.tar.gz
virtualjaguar_libretro-linux-rpi4-cortex-a72.so
virtualjaguar_libretro-linux-rpi4_64-cortex-a72-debug.tar.gz
virtualjaguar_libretro-linux-rpi4_64-cortex-a72.so
virtualjaguar_libretro-linux-rpi5-cortex-a76-debug.tar.gz
virtualjaguar_libretro-linux-rpi5-cortex-a76.so
virtualjaguar_libretro-linux-rpi5_64-cortex-a76-debug.tar.gz
virtualjaguar_libretro-linux-rpi5_64-cortex-a76.so
virtualjaguar_libretro-linux-x86_64-debug.tar.gz
virtualjaguar_libretro-linux-x86_64.so
virtualjaguar_libretro-macos-arm64-debug.tar.gz
virtualjaguar_libretro-macos-arm64.dylib
virtualjaguar_libretro-macos-x86_64-debug.tar.gz
virtualjaguar_libretro-macos-x86_64.dylib
virtualjaguar_libretro-switch-debug.tar.gz
virtualjaguar_libretro-switch.a
virtualjaguar_libretro-tvos-arm64-debug.tar.gz
virtualjaguar_libretro-tvos-arm64.dylib
virtualjaguar_libretro-vita-debug.tar.gz
virtualjaguar_libretro-vita.a
virtualjaguar_libretro-windows-i686-debug.tar.gz
virtualjaguar_libretro-windows-i686.dll
virtualjaguar_libretro-windows-x86_64-debug.tar.gz
virtualjaguar_libretro-windows-x86_64.dll
virtualjaguar_libretro.info

SHA-256 checksums

Verify with sha256sum --check SHA256SUMS.txt (Linux) or
shasum -a 256 --check SHA256SUMS.txt (macOS).
See SECURITY.md
for full verification instructions and antivirus false-positive guidance.

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