For personal use, the only extension card being normally added, I think, will
be the 24-bit color board. And the IIsi is not fast enough to run a good graphic
application even at 8-bit mode. Why people still want a NuBus adapter, which is
slower than the PDS, to have 24-bit color. There are many PDS 24-bit color
board spcially designed for the IIsi. These accelerated card draw much less
power than the apple 8.24GC card that means it won't burn your machine and cost
much less than the 8.24GC. Ilove the 8.24GC BUT we CANNOT use it in IIsi. And
also the 8.24GC is NOT compatible w/ system 7.0, that is why we have to turn it
off almost all the time in our computer lab.
There are some adapter cards on the market now offering an extra slot for the
IIsi to upgrate it speed while retaining an PDS for any other use, like adding
the 24-Bit color board.