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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: amiga1260 on September 02, 2008, 09:10:08 PM
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I want to buy a CPU 68030@50 MHz and a 68882@50 MHz from Softhut to replace the 68030EC @ 40 Mhz.
Do I only need a crystal of 50 Mhz, to get them both running at 50 Mhz?
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Check your current crystal for the 40mHz 68030. If it is 80mhz, then you need a 100mHz crystal for the 50mHz 68030 CPU and 68882 FPU you are installing.
I have the same accelerator for sale and when I return home in a couple of days, I could check what is installed in mine.
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Yes, just one crystal.
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@Amigadave: The crystal of my GVP board is a 40 Mhz crystal.
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amiga1260 wrote:
@Amigadave: The crystal of my GVP board is a 40 Mhz crystal.
Then you know you only need a 50Mhz crystal for your proposed upgrade. I have noticed on some other accelerator cards that the crystals are twice the CPU and/or FPU speed and the circuitry must halve the clock for them. As I am away from home, I could not check my GVP 1230 Turbo+ Series II to see what it used.
Good luck with your upgrade. If it does not run correctly at the faster speed, you could always re-install the 40Mhz crystal, but retain the 50Mhz CPU to have the full MMU.
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amigadave wrote:
I have noticed on some other accelerator cards that the crystals are twice the CPU and/or FPU speed and the circuitry must halve the clock for them.
you're talking about 68040 boards. 68030 uses 1/1 clock. (also 68060)