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