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This is the main CPU stack, inside it's metal shield case.
It comprises the boards below, which sit one on top of another, and form
the main processing center of the system. This stack does not perform any
of the input/output functions, such as controlling the force-feedback,
reading the steering, accelerator and brake, and flashing the lamps. It
communicates it's intentions via a two-way serial link to an I/O board. |
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This is the CPU board, which centers around an NEC V60
16MHz processor. Although it's only 16MHz, it is supported by Sega
Floating point processors, of which there are five on this board. |
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This is the Video output board. It contains all the memory
for the display, which is output at High-resolution EGA standard, which is
known in the Arcade industry as "medium resolution". The
horizontal scanning frequency is 25KHz, as opposed to 31.5KHz for VGA. |
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This is the communications board. It has it's own separate
Z80 processor to control the multi-way communications with the other CPU
stack in the twin, along with any other machines it is connected to, and
the Live commentary monitor. It communicates using two fiber-optic cables,
one for Transmit, the other for Receive. They are connected in a ring to
the other boards - E.G. 1tx connects to 2rx, 2tx connects to 3rx, 3tx
connects to 1rx. |
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This is the memory board, although a more proper name for
it would be "program board". IT contains the roms which house
all the game data. Note that the sound data is not on this board, but on a
separate sound card. |