Hi,
do you want to prepare the PCMCIA card in your PC?
But "In order to boot a router or a switch from a Cisco IOS® software file located on a PCMCIA Flash card, the Flash card must have been formatted in the target platform. Using a PCMCIA card formatted in the source platform may work in some cases; however, there are a number of situations where the bootstrap version of the target router does not support the formatted card, even if the filesystems are compatible."
See http://www.cisco.com/warp/public/63/pcmciamatrix.pdf for details.
So if you want to use the card in 6500 it has no sense to prepare it in your PC.
Regards,
Milan