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# Arcade Cabinets
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#### PSX-Based Arcade Boards
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The following arcade boards are known to be based on PSX hardware:
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- Namco: System 10, System 11, System 12
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- Konami: GV, GQ, [System 573](konamisystem573.md), Twinkle System
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- Sony: ZN-1, ZN-2
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- Taito: FX-1A, FX-1B, G-NET (uses ZN-2 motherboard)
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- Atlus PSX, PS Arcade 95, Tecmo TPS
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Currently only documentation for the System 573 exists. Information about other
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arcade boards could be obtained from MAME source code.<br/>
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#### CPU
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Same as in PSX. Some boards (e.g. ZN-2) have the CPU clocked at a higher clock
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speed, usually 48MHz.<br/>
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#### GPU
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Same as in PSX. Except, most or all boards are said to have 2MB VRAM instead of
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1MB. Unknown how the extra VRAM is accessed... maybe as Y=512..1023... (though
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the PSX VRAM transfer commands are limited to 9bit Ysiz values, but maybe Y
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coordinates can be 10bit wide).<br/>
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#### ROM vs CDROM
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No known arcade board uses the same CD drive used in the PSX. Most of them have
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no drive at all and use mask ROM or flash memory for game storage, while others
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(such as the 573 and Twinkle System) are equipped with standard ATAPI/SCSI CD
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drives or even hard drives in some cases. The 573 in particular has both 16MB
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of flash memory soldered to the motherboard and a CD drive, allowing games to
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e.g. quickly load data while also playing CD audio.<br/>
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#### SPU
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Most PSX-based arcade boards are having the PSX-SPU replaced by a different
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sound chip (with each arcade manufacturer using their own custom sound chip,
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often controlled by a separate sound CPU). Some have both the standard SPU as
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well as additional hardware for music or DSP effects, usually on a separate
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board.<br/>
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#### Controls
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Arcade boards are typically having digital joysticks instead of joypads, with
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differently named buttons as well as additional coin inputs, service/test
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buttons and DIP switches. Controls are connected to the motherboard through a
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standard JAMMA connector and accessed via custom memory-mapped I/O ports
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usually.<br/>
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Some boards also feature a JVS port (RS-485 serial over USB cables, commonly
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used instead of JAMMA to connect peripherals to modern arcade systems),
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allowing standard JVS I/O boards to be used if supported by games.<br/>
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