Disk caching comes standard with 1.2. Simply use the AddBuffers command
to tell the system how many buffers to use for each disk drive. I've heard
people say that they've used 1500 buffers and such with expansion memory, but
I've found that using 50 or 100 is really sufficient. With this many buffers,
the disks are rarely accessed whenever you run the same program twice or get
the same directory twice.
Gary