re motorola xc rc and rc in article apr rosie uh edu st my rosie uh edu stich christian e writes i just installed a motorola xc rc fpu in an amiga a board mhz with capability to clock the fpu separately previously a mc rc was installed and everything was working perfectly now the systems displays a yellow screen indicating a exception when it check for the presence type of fpu when i reinstall an mc rc the system works fine but with the xc even at mhz it does not work the designer of the board mentioned that putting a pullup resistor on data strobe ohm might help but that didn t change anything does anybody have some suggestions what i could do does this look like a cpu fpu communications problem or is the particular chip dead it is a pull not new moreover the place i bought it from is sending me an xc rc i thought that the rc were labeled mc not xc for not finalized mask design are there any mc rc i too have a xc rc math coprocessor which i installed succesfully in my mega midget racer clocked at mhz i have tried clocking my fpu at to mhz and it all worked just fine i have a mc cpu i don t know why my fpu has an xc my original mhz fpu was label mc but it seems to work fine on my system maybe you just have a bad chip stefan p s or does it mean experimental chip instead of motorola chip
