This is not true as Blizzard accelerators cleverly go around this problem of memory addressing space. There are OTHER (many, many other!) accelerators that do not, and could cause trouble for the user if more than 4MB of Fast RAM is installed.
I have an A1200D with B1260 and 128MB of Fast RAM installed and the PCMCIA NIC card is working like a charm. The only thing that I had to do was to insert the timing fixes in my Startup-Sequence's BlizKick line in order to remove the PCMCIA reset error(s) (yaaay, no hardware hacks required anymore!). ;-)
