Hyper Neo Geo 64

The system was first announced in late 1995, and planned for release in late 1996.^[3] It was officially unveiled at the February 1997 AOU show, though all that was demonstrated at the show was a videotape containing a few seconds of footage of Samurai Shodown 64, which SNK announced would be the first game for the system.^[4] By mid-1997 test units were on display in Japan.^[5]

The system was released, only in arcade form, in September 1997, featuring a custom 64-bit RISC processor, 4 megabytes of program memory, 64 megabytes of 3D and texture memory, and 128 megabytes of memory for 2D characters and backgrounds.^[6] The first title released for the system was Road's Edge, with Samurai Shodown 64 following soon after. Neither was particularly well received. The system was a failure^[7] and by 1999 was discontinued, with only seven games released in total. SNK resumed releasing games on their older Neo Geo system.^[8]

A home console version was rumored to be in production,^[9] but was never confirmed by SNK.^{[citation needed]}

• Processors:
  • CPU #1 (main): 100 MHz NEC VR4300 (64-bit MIPS III)
  • CPU #2 (auxiliary, handles audio I/O): NEC V53@16 MHz 16-bit microcontroller (V33 superset)
  • CPU #3 (auxiliary, handles communications I/O): KL5C80A12CFP@12.5 MHz 8-bit microcontroller (Z80 compatible)
• Memory layout:
  • 0x00000000..0x00FFFFFF: mainboard RAM (16 MiB)
  • 0x04000000..0x05FFFFFF: cartridge RAM (16 MiB)
  • 0x1FC00000..0x1FC7FFFF: ROM (512 KiB)
  • Cartridge ROM mapping is variable.
• Sound chip:
  • L7A1045 L6028 DSP-A: 32-channel PCM audio, with maximum sampling frequency of 44.1 kHz (CD-quality) and 32 MB of sample RAM^[10]
• Display:
  • Color palette: 16.7 million^[11]
  • Maximum onscreen color palette: 4,096
  • 3D branch: 96 MB vertex memory, 16 MB maximum texture memory^[11]
  • 2D sprite branch: 60 frames per second animation, 128 MB character memory^[11]
    • Main functions: scaling, montage, chain, mosaic, mesh, action, up/down, right/left reverse
    • Sprites per frame: 1,536 sprites^[12]
  • 2D scrolling branch: Up to 4 game planes, 64 MB character memory^[11]
    • Main functions: scaling, revolution, morphing; horizontal/vertical screen partitioning and line scrolling

• Aleck 64