Acill's Amiga Repair Thread

[desantii]

Looks awesome!!!! Thanks

Too bad the 060 adapter was shot

[desantii]

Will running that 3640(now 3660) at 66mhz make the motherboard run at 33mhz? Probably the limit of what it can do...

Or is the speed independent of the 25mhz clock running the mb

[desantii]

I always though EXT means the MB is running based on the external CPU board clock...Is this the same case on a A3000?

The speed does not make the MB run faster, only the CPU from my understanding since you set the clock jumpers for accelerator to EXT on the A4000 which uses the oscillator on the accelerator instead of the one on the board. This makes the crystal on the 3640 run at full speed as well instead of the half speed the usual 040 runs at. This is the fastest the 3640 will run however stable. The CPU on it in another accelerator can run as high as 100Mhz I've seen. Cosmos is the better person to ask about this version of the upgrade though. He designed it from what I understand. I just built it from the parts he supplied and soldered it all together.