THE OCULUS-F/64 FRAME GRABBER User's Manual

I/O addressed communication is the default case, where the base address set by
switches SW1 defines the 16 address block used by the Oculus-F/64. This is
the most trouble free configuration, requiring only that the base address be
unused in the host computer. As an example, using the factory default I/O
address of 280, the I/O address range 280 to 28f needs to be free. (Note that all
addressing is described in hex format).
Bus Interface Mapping
[ 1 ] Memory Mapped
[ 2 ] I/O Mapped
Enter Selection: 2
The alternative mode of communication is by memory map addressing. This
method requires that a portion of the computer's address space be mapped to
access a portion of the Oculus-F/64 frame buffer memory. The potential for
conflict is high unless the various preparations, as described below, are
performed. If the Oculus-F/64 is configured for memory mapped interfacing,
conflicts will quickly show themselves by a crashed application or computer,
since all communications are via memory map.
For memory mapped communications, two items need to be defined. Memory
Map Address defines the base memory of the block of addresses that will be
pointed to the Oculus-F/64. The second is Memory Map Size which defines
the size of the continuous addresses used for direct memory addressing. The
two selection screens are shown below.
Memory Map Address (ie: D0000 = D0)
Enter Value [ C8..FFE] ( D0) ? D0
Coreco Inc., Installation and Configuration Page 2-17