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1260-00C User Manual
Interrupt Handler
Levels
External Input
Termination
EPROM
Configuration
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three VXI programmable interrupt handlers. They are assigned
dynamically by the RM, or statically according to the contents of
the non-volatile memory, as described in Chapter 5.
Switches S12 and S16 enable a 50-ohm termination to ground for
the external trigger and external clock inputs. The 1260-00C is
factory-configured with the termination disabled for both the
external trigger and the external clock inputs. Figure 3-3 shows
the settings required to enable or disable the termination on the
external trigger. Figure 3-4 shows the settings required to enable
or disable the termination on the external clock.
Figure 3-3, External Trigger Input Termination
Figure 3-4, External Clock Input Termination
The amount of Read Only Memory (ROM) in the 1260-00C can
vary from 512 kilobytes to 1 Megabyte. The standard
configuration consists of 512 kilobytes of EPROM used for the
operating firmware. An EPROM expansion option can be used to
give an additional 512 kilobytes of EPROM space. It contains four
sockets and four switches that can be used to install a
user-developed code.
The EPROM expansion sockets accommodate combinations of
2764, 27128, 27256, 27512, and 27010 EPROMs. Table 2-5 lists
Operation 3-7
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