Upgrading Q40 to 68060 CPU

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Peter
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Re: Upgrading Q40 to 68060 CPU

Postby Peter » Wed May 11, 2022 10:03 pm

The oscillator frequency can be 60.0 MHz or 66.0 MHz depending on jumper setting. For the 68060RC50A CPU you apparently had ordered, I would recommend 60.0 MHz.


Silvester
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Re: Upgrading Q40 to 68060 CPU

Postby Silvester » Wed May 11, 2022 10:13 pm

Peter wrote:The oscillator frequency can be 60.0 MHz or 66.0 MHz depending on jumper setting. For the 68060RC50A CPU you apparently had ordered, I would recommend 60.0 MHz.
I don't have RC50A grade, I only have RC50 (for other project). I was going to get a RC66 (pending a RC75) , so I'll get 66.000MHz oscillator, thanks.

(I think the confusion may be that Derek had a RC50A, I could only get RC50 75G59Y - which I don't think I'll push 20% to 60MHz, since RC66 are available.)


David
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Re: Upgrading Q40 to 68060 CPU

Postby Derek_Stewart » Thu May 12, 2022 9:05 am

Silvester wrote:
Peter wrote:The oscillator frequency can be 60.0 MHz or 66.0 MHz depending on jumper setting. For the 68060RC50A CPU you apparently had ordered, I would recommend 60.0 MHz.
I don't have RC50A grade, I only have RC50 (for other project). I was going to get a RC66 (pending a RC75) , so I'll get 66.000MHz oscillator, thanks.

(I think the confusion may be that Derek had a RC50A, I could only get RC50 75G59Y - which I don't think I'll push 20% to 60MHz, since RC66 are available.)

HI,

I did mean to confuse the issue, I only stated what was produced, not what can be produced.

Since I have built many Q60 boards and repaired many Q40 boards, I can give some advice on te construction, but not the design.


Regards,

Derek

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