From Sega Retro
Gens |
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System(s):Sega Mega Drive, Mega-CD, 32X |
OS: Windows, DOS, Linux |
Developer: Stéphane Dallongeville |
Programmed in: Assembly, C++ |
Last release date: 2006-05-20[1] (12 years ago) |
Last version: 2.14 |
Gens is a Sega Mega Drive emulator programmed by Stéphane Dallongeville. It runs on Windows systems (using DirectX) and on Linux (using Simple DirectMedia Layer). The earliest semi-functional release (only capable of debugging 68000 instructions) dates from 1999 and runs on DOS. As of September 2004, the current version (2.12b) advertises full compatibility with '92%' of all Genesis games. As with all emulators, games or ROM images are not included and have to be downloaded or obtained (copied) separately.
Gens also supports running Mega-CD and 32X games if provided with the respective BIOS files, which are not provided with the emulator. In addition, Game Genie codes allowing games to run with cheats are supported.
Another feature is support for the Kaillera Client, which allows games on the Gens emulator (as well as other emulators) to be played over a LAN or the Internet. However, on Gens at least, this is not as smooth a process as one would hope; a common problem is that on either PC, the other player appears to be a few seconds behind (lag); this may result in them appearing to attack non-existent enemies for example.
Gens can also record what buttons are pressed and slow the gameplay down so it is used in making of tool-assisted speedruns.
Gens v2.14 was the first emulator ever that featured save state support for Mega-CD.
There is a number of unofficial versions, including:
- DebuGens by Fuzzbuzz
- DualGens by Qjimbo
- Gens (for Xbox) by XPort
- Gens 2.10-mk1/mk2 by Nick o'DIMM
- Gens KMod by Kaneda
- Gens Plus by Rodrigo Cardoso
- Gens Re-Recording by Jyzero, Nitsuja and Upthorn
- Gens Tracer by g8z et al
- Gens X (for Xbox) by Hikaru
- Gens/GS by GerbilSoft
- Gens32 by DarkDancer
- IDC Log Gens by Nemesis
- sGens by LOst
- 1Downloads
Downloads
Download Gens File: Gens v2.14.7z (362 kB) (info) Current version: 2.14 Souvenir (Win32) |
Old versions
- Gens versions 0.01a-2.14, plus 2.14 source code.(info) (6.81 MB)
External link
References
- ↑http://www.gens.me:80/ (archived: 2010-04-06 16:33)
From Sega Retro
The Basic Input-Output System or BIOS is computer interface code that locates and loads the operating system into RAM. It provides low-level communication, operation and configuration to the hardware of a system, which at a minimum drives the joypad and provides primitive output to a display. The BIOS is usually written in the Assembly language native to the processor. Listed below is information regarding the attraction modes to Sega's hardware systems, which are the sequences displayed to the end user upon starting up the system.
Sega Master System
Based on the Sega Mark III in Japan, the Sega Master System (SMS) had a BIOS just like any other computer interface. Almost all of Sega's hardware systems had some form startup sequence that graphically told the end user that a game was loaded and ready to play. However, what was unique about SMS was that Sega had included built-in games that could be played without any cartridges inserted.
The first known BIOS released was based upon the Sega Mark III, which featured an animated blue SEGA logo, along with MASTER SYSTEM written underneath. California dmv restriction code 28. This was a prototype that wasn't released in the final product and is designated as Prototype M404 among emulation communities. (See here for video demonstration)
Among its final release in North America in June 1986, the first major BIOS known publicly is the SEGA startup sequence. The animation sequence this time was the SEGA logo sliding from the left side in the center of the screen, followed by MASTER SYSTEM and its copyright information shown underneath. The trademark SEGA sound as heard in many of the Sonic the Hedgehog games, is also played in the background using melodic system tones (See here). Although less animated, there was an extra hidden game that could played upon startup. By pressing 1, 2 and UP on the controller, the player could play the infamous Snail game.
Japanese releases of the SMS BIOS offered more musical graphical enhancements, along with music from Space Harrier (See here).
Finally, Sega also packaged other games with the system built-in similar to the Snail game, but was no longer hidden to the end user. Depending on the console build and BIOS included with the system, players could choose to play either Hang On, Missile Defense 3-D, and Safari Hunt.
Sega Mega Drive / Genesis
Early production runs of the Sega Mega Drive did not include a boot ROM; instead, they instantly started the ROM cartridge if one was present, or booted to a device on the expansion port if a cartridge was not present. In 1990, Sega introduced the TradeMark Security System (TMSS), which includes a 2 KB startup ROM that runs before the ROM cartridge if a cartridge is present. The TMSS program checks the ROM cartridge to make sure it has the correct copyright information. If it does not, the system halts. Otherwise, it displays a message saying 'PRODUCED BY OR UNDER LICENSE FROM SEGA ENTERPRISES LTD.', pauses for a few seconds, and then continues to load the game.
Once the game is loaded, the TMSS ROM is mapped out of the system address space, making it inaccessible to the game program.
Sega Mega-CD
The Sega Mega-CD, known as the Sega CD in North American audiences, featured a Boot ROM similar to that of the Sega Master System. The Boot ROM provided an Audio CD player interface as well as CD-ROM access functionality utilized by Sega CD games. Multiple versions of the Boot ROM were released for different regions and hardware revisions.
Since the Sega CD Boot ROM contains the CD-ROM access functions, Sega was able to change parts of the CD-ROM hardware without breaking existing games. Digital communication by bakshi pdf free download. However, this does mean that a Boot ROM designed for e.g. Model 2 consoles may not necessarily work properly on Model 1 consoles and vice-versa. Sega CD emulators are typically designed around Model 1 hardware, and hence may have problems with Boot ROMs designed for other systems, including Model 2, Wondermega, X'Eye, and CDX/MultiMega.
First and foremost, the Mega CD was not a standalone system. It was actually attached to any Model 1 or 2 Sega Mega Drive, giving the Mega Drive full control of the CD system. The standalone Multi-Mega and CDX systems, although combined as one machine, follow the same startup procedures as follows. If a cartridge based game is inserted into the MD, then the MCD remains idle. However, if there is no cartridge inserted, then the MCD gets full control and begins its sequences. If no CD is inserted, the attract music and SEGA animations continue to play until the player makes a decision. He or she can either continue watching the sequence, insert a game disc, or press A, B, or C to enter the CD-Player mode. From the CD Player, the user can either play music, manage items on the backup RAM, or again, insert a game disc.
Below are revisions of each BIOS version according to region and model. Clicking on the region will link you to a video demonstration of its attract mode. For CRC information, downloading of BIOS files, and further machines that feature the BIOS below, please see the BIOS section from the Sega Mega-CD page.
Version | System & Region |
1.00 | Mega CD (E/J)) |
1.10 | Sega CD (NA) |
2.00 | Mega CD 2 (E/J), Sega CD 2 (NA) |
2.11 | Mega CD 2 (E/J), Sega CD 2 (NA) |
2.21 | Sega Multi-Mega (E), Sega Genesis CDX (NA) |
Boot ROM version 2.00 and later support use of a Sega Mega Mouse on control port 2. This can be used instead of the control pad to control the CD player interface.
Other
Information relating to Sega Saturn and Sega Dreamcast are coming soon!
Screenshots
http://www.emulationgalaxy.co.yu/images/systems/SATURN_bios.jpgSega Saturn BIOS.
RockShox forks can be tuned for your particular weight, riding style, and terrain. SETTING SA G (J1, J2 AND J3). Judy forks are designed to sag when you are. Rock shox judy j3 manual.
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