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Re: Upgrading Q40 to 68060 CPU
Posted: Wed May 11, 2022 10:03 pm
by Peter
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.
Re: Upgrading Q40 to 68060 CPU
Posted: Wed May 11, 2022 10:13 pm
by Silvester
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.)
Re: Upgrading Q40 to 68060 CPU
Posted: Thu May 12, 2022 9:05 am
by Derek_Stewart
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.