Multicarts: Difference between revisions
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NeoGeo | A NeoGeo multicart is an [[bootleg|unofficial]] compilation cartridge, containing a selection of games. Most of them (all ?) are of the [[MVS hardware|arcade type]] but some can be played on the home console by using an [[MVS to AES adapter]]. | ||
Many of these contain multiple versions or hacks of a given game, as it can be seen on the usually provided list. | Many of these contain multiple versions or hacks of a given game, as it can be seen on the usually provided list. | ||
See http://wiki.arcadeotaku.com/w/MVS_Multicart | See http://wiki.arcadeotaku.com/w/MVS_Multicart | ||
Dedicated pages: | |||
* [[161-in-1 Series 1]] | |||
* [[138-in-1]] | |||
==Brute force method== | ==Brute force method== | ||
Early multicarts worked in pair with a complex add-on board which had to be connected to the system's [[JAMMA connector pinout|JAMMA connector]] and the cartridge itself via a ribbon cable. | |||
The board had mechanical relays (on the +5V and +12V lines) to control power to the MVS board, and a large LPC2214 microcontroller to generate the menu display itself. | The board had mechanical relays (on the +5V and +12V lines) to control power to the MVS board, and a large LPC2214 microcontroller to generate the menu display itself. | ||
When a selection is made, the game code is presented to the cartridge as a binary word | When a selection is made, the game code is presented to the cartridge as a binary word through the ribbon cable, the MCU stops generating video and the MVS board is powered up. | ||
Changing games requires the user to press a combination of buttons, making the add-on board | Changing games requires the user to press a combination of buttons, making the add-on board stop the MVS board and display the menu again. | ||
==Software method== | ==Software method== | ||
The game bank is set | A few years later, menus running on the MVS hardware itself were made and embedded in the cartridge's memory, making everything simpler and cheaper. | ||
The game bank is set by the software through custom registers mapped in the [[68k memory map|second cartridge zone]], which are implemented in large CPLDs. | |||
[[Category:Cartridge systems]] | [[Category:Cartridge systems]] | ||
Revision as of 16:39, 18 February 2018
A NeoGeo multicart is an unofficial compilation cartridge, containing a selection of games. Most of them (all ?) are of the arcade type but some can be played on the home console by using an MVS to AES adapter.
Many of these contain multiple versions or hacks of a given game, as it can be seen on the usually provided list.
See http://wiki.arcadeotaku.com/w/MVS_Multicart
Dedicated pages:
Brute force method
Early multicarts worked in pair with a complex add-on board which had to be connected to the system's JAMMA connector and the cartridge itself via a ribbon cable.
The board had mechanical relays (on the +5V and +12V lines) to control power to the MVS board, and a large LPC2214 microcontroller to generate the menu display itself.
When a selection is made, the game code is presented to the cartridge as a binary word through the ribbon cable, the MCU stops generating video and the MVS board is powered up.
Changing games requires the user to press a combination of buttons, making the add-on board stop the MVS board and display the menu again.
Software method
A few years later, menus running on the MVS hardware itself were made and embedded in the cartridge's memory, making everything simpler and cheaper.
The game bank is set by the software through custom registers mapped in the second cartridge zone, which are implemented in large CPLDs.