Replacing cpu on A GVP A1230 Turbo+ Series II

[amigadave]

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.

[amigadave]

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.