286 12Mhz clock speed is slightly different

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EluanCM
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286 12Mhz clock speed is slightly different

Postby EluanCM » Wed 25 Oct, 2017 6:28 pm

According to every datasheet I could find, the all the -12 80286s were actually 12.5MHz. This is a small difference from the round 12Mhz value currently in the code, but I thought I would report it anyway.
SarahWalker
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Re: 286 12Mhz clock speed is slightly different

Postby SarahWalker » Wed 25 Oct, 2017 9:18 pm

It's really going to depend on what clock the motherboard provides. The 286/12 motherboard I own definitely clocks the CPU at 12.0 (divided down from a 48 MHz oscillator).
iwasaperson
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Re: 286 12Mhz clock speed is slightly different

Postby iwasaperson » Thu 26 Oct, 2017 5:53 am

SarahWalker wrote:It's really going to depend on what clock the motherboard provides. The 286/12 motherboard I own definitely clocks the CPU at 12.0 (divided down from a 48 MHz oscillator).

Just checked my Dell 286 rig. 12.5 MHz divided from a 25MHz clock.
EluanCM
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Re: 286 12Mhz clock speed is slightly different

Postby EluanCM » Tue 31 Oct, 2017 11:18 pm

Mine is 12.5MHz too, that's the reason I made this suggestion. But it's okay, just a small change that I can maintain locally

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