Beetle-Saturn

This is fork of Mednafen Saturn. It has been ported to the libretro API. It currently runs on Linux, OSX and possibly Windows.

Beetle Saturn libretro This is fork of Mednafen Saturn. It has been ported to the libretro API. It currently runs on Linux, OSX and possibly Windows.

Running

To run this core, the "system directory" must be defined if running in RetroArch. The Saturn BIOS must be placed there, $sysdir/{sega_101,mpr-17933}.bin for Japanese, NA and EU regions respectively.

Loading ISOs

Beetle Saturn needs a cue-sheet that points to an image file, usually an .iso/.bin file. If you have e.g. foo.iso, you should create a foo.cue, and fill this in:

FILE "foo.iso" BINARY

TRACK 01 MODE1/2352

INDEX 01 00:00:00

Afte

r that, you can load the foo.cue file as a ROM. Note that this is a dirty hack and will not work on all games. Ideally, make sure to use rips that have cue-sheets. If foo is a multiple-disk game, you should have .cue files for each one, e.g. foo (Disc 1).cue, foo (Disc 2).cue, foo (Disc 3).cue.To take advantage of Beetle's Disk Control feature for disk swapping, an index file should be made.

Open a text file and enter your game's .cue files on it, like this:

foo (Disc 1).cue

foo (Disc 2).cue

foo (Disc 3).cue

Save as foo.m3u and use this file in place of each disk's individual cue sheet.

Suggested Firmware

sega_101.bin (85ec9ca47d8f6807718151cbcca8b964) mpr-17933.bin (3240872c70984b6cbfda1586cab68dbe) mpr-18811-mx.ic1 (255113ba943c92a54facd25a10fd780c) mpr-19367-mx.ic1 (1cd19988d1d72a3e7caa0b73234c96b4)

Options

CD Image Cache - Loads the complete image in memory at startup

Initial Scanline - Sets the first scanline to be drawn on screen

Initial Scanline PAL - Sets the first scanline to be drawn on screen for PAL systems

Last Scanline - Sets the last scanline to be drawn on screen

Last Scanline PAL - Sets the last scanline to be drawn on screen for PAL systems

hiddenasbestos brought the libretro port up to parity with upstream v0.9.47 v0.9.48, which gives a few ton of nice accuracy improvements and the much-awaited savestate support (savestates made with the v0.9.47 version are not compatible with the v0.9.48 update, so beware if you made a bunch of states in the short time between updates). Tatsuya79 and retro-wertz provided a number of improvements to the overscan and cropping behavior.

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