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A state stored the whole 22 MB DRAM allocation -- sized for the
largest memory configuration and the high-resolution VRAM copies --
plus both ROMs, whatever the game used, and the DSP's 70 KB of decode
tables. V4 keeps everything else as it was and changes two chunks:
- MEM2 replaces MEM. It holds the memory configuration, then only the
RAM that configuration uses (DRAM, VRAM and VRAM's three high-
resolution copies), then NVRAM. The copies are kept whether or not
high resolution is on, because it can be switched mid-game and the
state size must not change under a frontend that sized its buffers
once; the configuration itself is fixed for a session. The ROMs are
left out: they are the BIOS and font loaded for the session and
never change. For the stock 2 MB/1 MB configuration that is 6 MB of
RAM instead of 22 MB, and 2 MB of ROM gone.
- DSP2 replaces DSPP. INSTTRAS, REGCONV and BRCONDTAB are decode tables
opera_dsp_init() builds and nothing changes, so they are not stored;
a load keeps the running core's.
V3 states still load: MEM and DSPP are still read, and the tables a
DSPP chunk carries are stepped over. A core without this change
refuses a V4 state as an unknown version.
Measured with a libretro driver, stock configuration, together with
the array I/O change before this:
size serialize unserialize
before 25550222 3.8 ms 4.2 ms
V4 6605970 0.5 ms 0.6 ms
Checked: a V3 state saved by the previous core loads and plays the
next 240 frames with audio and video identical to the original run; a
V4 state does the same; save-load-save is byte-identical; a replay of
60 frames from a loaded state matches; a sweep flipping 9721 bytes
never lets a refused load change the running state; and the changed
files build big-endian (PowerPC).
opera-libretro
Opera is a fork of 4DO, originally a port of 4DO, itself a fork of FreeDO, to libretro. The fork/rename occurred due to the original 4DO project being dormant and to differenciate the project due to new development and focus.
ROMS
| Filename | Hash |
|---|---|
| opera-boot.bin | Build-dependent (external ROM) |
| panafz1.bin | md5:f47264dd47fe30f73ab3c010015c155b |
| panafz1j.bin | md5:a496cfdded3da562759be3561317b605 |
| panafz1j-norsa.bin | md5:f6c71de7470d16abe4f71b1444883dc8 |
| panafz10.bin | md5:51f2f43ae2f3508a14d9f56597e2d3ce |
| panafz10-norsa.bin | md5:1477bda80dc33731a65468c1f5bcbee9 |
| panafz10e-anvil.bin | md5:a48e6746bd7edec0f40cff078f0bb19f |
| panafz10e-anvil-norsa.bin | md5:cf11bbb5a16d7af9875cca9de9a15e09 |
| goldstar.bin | md5:8639fd5e549bd6238cfee79e3e749114 |
| sanyotry.bin | md5:35fa1a1ebaaeea286dc5cd15487c13ea |
| 3do_arcade_saot.bin | md5:8970fc987ab89a7f64da9f8a8c4333ff |
For certain Japanese games a second "Kanji" ROM is necessary.
| Filename | Hash |
|---|---|
| panafz1-kanji.bin | md5:b8dc97f778a6245c58e064b0312e8281 |
| panafz1j-kanji.bin | md5:c23fb5d5e6bb1c240d02cf968972be37 |
| panafz10ja-anvil-kanji.bin | md5:428577250f43edc902ea239c50d2240d |
opera-boot.bin
Opera includes Opera Boot (Built-in) as its first BIOS setting and default
(opera-boot-internal). Its compressed ROM is embedded in the core, so no
external BIOS file is required.
Supported BIOS ROMs placed in the RetroArch / libretro System Directory
appear after the built-in option and can be selected normally. This includes
opera-boot.bin, shown separately as Opera Boot (System). "norsa" versions
have the RSA encryption check disabled, allowing unsigned software to run.
More details about the opera-boot boot ROM can be found at: https://github.com/trapexit/opera-boot