Chapter 2
Configuration and Startup Procedures
©
National Instruments Corporation
2-9
EPROM Configuration
The amount of read-only memory (ROM) in the GPIB-VXI/C can vary
from 512 KB to 1 MB. The standard configuration consists of 512 KB of
EPROM, which is used for the operating firmware. The GPIB-VXI/C also
includes four sockets for EPROM expansion.
The EPROM expansion sockets accommodate combinations of 2764,
27128, 27256, 27512, and 27010 EPROMs. Table 2-5 lists the possible
EPROM memory configurations. Bank 2 has a base address of E80000h
and Bank 3 starts at EC0000h. The maximum EPROM expansion memory
size is 512 KB.
When you insert EPROMs into the expansion EPROM slots, orient them
according to the silkscreen printed on the board as shown in Figure 2-1.
The 2764, 27128, 27256 and 27512 EPROMs have fewer pins than the
expansion
sockets. In
these
cases, align the bottom pins
of the
EPROM
with the
bottom
pins of the socket, leaving the top pins open, as illustrated
in Figure 2-5.
Caution
Improper EPROM installation can result in damage to the EPROM,
the GPIB-VXI/C, or both.
Table 2-5.
Expansion EPROM Configurations
EPROM
Size
BANK 2
(U47, U55)
BANK 3
(U53, U59)
S11
S14
S10
S13
End
Address
16 KB
2764
None
OFF
OFF
OFF
OFF
E83FFFh
32 KB
27128
None
OFF
OFF
OFF
OFF
E87FFFh
64 KB
27256
None
OFF
ON
OFF
OFF
E8FFFFh
128 KB
27512
None
ON
ON
OFF
OFF
E9FFFFh
256 KB
27010
None
ON
ON
OFF
OFF
EBFFFFh
272 KB
27010
2764
ON
ON
OFF
OFF
EC3FFFh
288 KB
27010
27128
ON
ON
OFF
OFF
EC7FFFh
320 KB
27010
27256
ON
ON
OFF
ON
ECFFFFh
384 KB
27010
27512
ON
ON
ON
ON
EDFFFFh
512 KB
27010
27010
ON
ON
ON
ON
EFFFFFh
