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Old 12-30-2012, 08:22 PM
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lnx64 lnx64 is offline
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Overclocking!

Yay for overclocking!

http://www.youtube.com/watch?v=73pVTtsNa4g
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Old 12-31-2012, 08:55 PM
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StellarTV StellarTV is offline
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What did you do to overclock the machine exactly? Are you switching in a different crystal?
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Old 12-31-2012, 09:07 PM
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lnx64 lnx64 is offline
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Yes, I installed a 4-pin crystal oscillator. It outputs the same exact type of pulse the 68k normally accepts.
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Old 01-01-2013, 03:22 PM
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OIB1981 OIB1981 is offline
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Pretty neat. You taught me something to day. Didn't know the sega ran sound off z80 and it use the other processor for graphics.
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Old 01-02-2013, 08:13 AM
ischmidt ischmidt is offline
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The Genny was loosely derived from Sega's 1985 "System 16" arcade board, and in arcades "68k for graphics and Z80 for sound" was nearly ubiquitous from the mid-80s through the early 90s. The SNES also has a second CPU for sound; their sound CPU and sound processor were designed for Nintendo by Sony's Ken Kutaragi, who later used beefed-up versions of that sound chip in the PlayStation and PS2.
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Old 01-02-2013, 10:21 AM
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lnx64 lnx64 is offline
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The 68k also did the game engine too.

The system 16 uses a 10mhz CPU. This is why I chose a 10mhz overclock. So my genesis is essentially as fast as a true system 16. Though it still has a weaker graphics chip.
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Old 01-02-2013, 11:04 AM
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Nick_the_'Nole Nick_the_'Nole is offline
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I may have to try this on my VA7 Genesis, since I'm planning to take it apart and do the 'crystal-clear audio' mod to it anyway.

I'm a little curious about the region mod, though... is there some particular reason you went with two switches, rather than a SP3T? Or is it just that you didn't have a SP3T laying around?
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Old 01-02-2013, 11:19 AM
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I went with the two switches because there is actually a 4th region, which entails JAP/50Hz. I don't think any games support it, but I didn't think about it until after I made the mod.
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