2-6
VL-1225/6 Analog Input/Output Board
Board Addressing
The VL-1225/6 supports 8-, 10-, and 16-bit I/O addressing, and 16-bit memory addressing. 8-bit I/O
addressing is used with most 8-bit processors (Z80, 8085, 6809, etc.) which provide 256 I/O addresses. 10-
or 16-bit addressing can be used with 16-bit processors (8088, 80188, 80186, etc.) to decode 1024 or 65536
I/O port addresses. 16-bit memory addressing can be used with most 8-bit processors (Z80, 8085, 6809,
etc.) if desired.
I/O addressing can be extended (capacity doubled) using the IOEXP signal which is decoded by the VL-1225/
6. Memory addressing can be extended (capacity doubled) using the MEMEX signal which is decoded by
the VL-1225/6.
As shipped the board is configured for 16-bit memory addressing with a board address of hex FF08. The
card occupies eight consecutive addresses (i.e. FF08H to FF0FH). The VL-1226 uses four of these
addresses as control, data, and status registers, the remaining four are inaccessible. The VL-1225 uses
six addresses, with two inaccessible. See the Register Mapping section on page 4-1 for further information.
Configuration – Board Addressing
Содержание STD32 VL-1225
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