User`s manual

Technical Reference
Intellio C320Turbo User's Manual A-5
Dual-Ported RAM
There is 512 KB of dual-ported DRAM on the Intellio C320Turbo Control Board which
is used as a data buffer and memory map device for the motherboard. it is called
“dual-ported” because it is accessed by both motherboard CPU and the C320Turbo
Control Board's on-board CPU. Generally speaking, the memory access time is much
faster than normal I/O access.
All messages and data are transferred through this 512 KB dual-ported memory. The
buffer area appears as normal 16-bit memory to the PC AT I/O channel.
Every Intellio C320Turbo Control Board only occupies 16 KB of memory space
(window) from the system point of view. There are six possible base addresses you
can choose from, which are below 1 MB. Please see Chapter 2 for dip switch settings.
For UNIX users, 36 more base addresses are available, which are above 1 MB and
below 16 MB. The followings are the SW1 dip switch settings for base addresses
above 1 MB and below 16 MB. However, the more RAM installed in the PC, the less
base addresses available under UNIX.