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3. The hexadecimal number in bold is the digitizer’s A24 base address.
4. Read the digitizer’s offset register in A16 address space. As shown in
Figure C-1, the Offset register is one of the digitizer’s configuration
registers.
In a system where the HP E1406 Command Module allocates address
space, the A16 base address of the configuration registers is
computed as:
1FC000
16
+ (LADDR * 64)
16
2,080,768 + (LADDR * 64)
where 1FC000
16
is the starting location of the configuration register
addresses, LADDR is the digitizer’s logical address, and 64 is the
number of address bytes in A16 per VXI device.
The digitizer’s factory set logical address is 40. If this address is not
changed, the base address of the digitizer’s configuration registers in
A16 is:
1FC000
16
+ (40 * 64)
16
1FC000
16
+ A00
16
= 1FCA00
16
or decimal
2,080,768 + (40 * 64)
2,080,768 + 2560 = 2,083,328
Given the A16 base address and the "offset" of the Offset register (06
from Figure C-1), the digitizer’s A24 base address can be determined
as shown in the program A24_REAL.C.
Appendix C Register Programming 345