The '315-5242' is a custom IC used on some Sega arcade systems :
The 'core' of the '315-5242' is a surface mounted IC (PQFP44 package) located on top of the module, the 'M71064' from OKI manufacturer :
No info or reference was available for this fully digital IC until some time ago when 'furrtek' decapped it and traced schematics from the silicon die revealing the internal structure and figuring out the functions :
Most of the work was done so the step to a real replacement was the easy and logical consequence.And here we are!I designed a proper board based on a +5V CPLD :
Testing on all boards I could try was successful.
Columns II (System C2)
Michael Jackson's MoonWalker (System 1
Spider-Man (System32)
Thanks again to 'furrtek', without his brilliant work none of this would have been possible.
- System C/C2
- System 18/24/32
- System X
- System Y
The 'core' of the '315-5242' is a surface mounted IC (PQFP44 package) located on top of the module, the 'M71064' from OKI manufacturer :
No info or reference was available for this fully digital IC until some time ago when 'furrtek' decapped it and traced schematics from the silicon die revealing the internal structure and figuring out the functions :
Most of the work was done so the step to a real replacement was the easy and logical consequence.And here we are!I designed a proper board based on a +5V CPLD :
Testing on all boards I could try was successful.
Columns II (System C2)
Michael Jackson's MoonWalker (System 1

Spider-Man (System32)
Thanks again to 'furrtek', without his brilliant work none of this would have been possible.
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