File Size: 12.57 MB Genre: Shooter System: Neo Geo Downloads: 2,026,571 Rating: (4.85 /5, 7,098 votes). Neo Geo MVS: $500 – $700 (not including transportation or game carts) The Neo Geo MVS was the original arcade platform for use in arcade cabinets. Due to being developed in tandem with the AES, they share many properties and are nearly identical, but MVS games are in most case MUCH cheaper (also see below for ways to save money without buying a full arcade cabinet).The MVS was notable in. Neo Geo Mini is a dedicated miniature home arcade console developed by SNK as part of the company's 40th Anniversary celebration, released on July 24, 2018. The new hardware is packed with 40 built-in Neo Geo titles and was made to thank all the fans that have supported SNK series such as The King of Fighters, Fatal Fury, Samurai Shodown, Metal Slug, and more.

The NeoGeo home console and some MVS cabs can use JEIDA V3 memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card address space can be freely used, games should only perform memory card operations through the CARD system ROM call to avoid data corruption.

• 4Data format

The SP-S2 system ROM (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:

• 2KiB
• 4KiB
• 6KiB
• 8KiB
• 10KiB
• 14KiB
• 16KiB

And 4 different card types:

• 8 bits wide (only the low byte is used)
• 16 bits wide
• 16 bits wide 'doubled'
• 'SNK ROM' cards

The original SNK-branded memory card was a battery-backed 8-bit wide 2KiB card using a LH5116 SRAM chip and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. Unlike the MVS backup RAM battery, the memory card one isn't rechargeable.

There are at least 2 known versions of the original SNK Memory Card, each with its individual design and circuit-board:

The first version has the C10075-X2-2 while the later one hase the EZ866 board.

A 'virtual' memory card is embedded in CD systems as a 8KiB battery-backed SRAM chip.

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as 'blocks', one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

Header

Always 64 bytes.

Directory

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

Neo Geo Rom Set Torrent

FAT 1

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.

• $02 is a block reserved by the system ROM
• $01 is a block used by a game
• $00 is a free block

FAT 2

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

Game Data

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

Full Neo Geo Rom Set

• Write is enabled if REG_CRDUNLOCK1 and REG_CRDUNLOCK2 are written to
• The WP (Write Protect) pin is read through bit 6 of REG_STATUS_B
• CD1 (Card Detect 1) is read through bit 4 of REG_STATUS_B
• CD2 (Card Detect 2) is read through bit 5 of REG_STATUS_B
  • Both must be 0 if the card is inserted correctly
• Attribute memory is selected if REG_CRDREGSEL is written to, never used ?

See Memory card pinout.

Neo Geo Rom Size Chart