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SECTION 3 B R E A D B O A R D OPERATION
3.1 I N T R O D U C T I O N
There are
two
methods of controlling user-defined circuitry on the breadboard area. The
first way is to use the upper half of the 68000 address space and the appropriate software
tools. The second and easier approach is to
use
the 96 buffered I/O lines available on the
breadboard card. This section discusses the latter approach.
For more complex programming, the user may download user-defined code which can run
interactively with the local command set. This is described in more detail in Section 4.
3.2 C o m m a n d Parsing
User-defined commands can easily be added and used in conjunction with the local
command set of the breadboard. When a command is sent to the 7064 using word serial
protocol, it is received and parsed by the command parser. I f the command matches a
command from the local command
set,
the appropriate routine is called. I f no matching
command is found (user-defined command), the command is placed in the secondary input
queue. The user routine called from the main loop will then retrieve the characters from
the secondary input queue and parse for their own commands. The nvsetvect command
can be used to allow the 7064 parser to be bypassed, allowing the users parser to take
control of the 7064. I f there are no main loop user routines, the main loop generates an
error for the characters placed in the secondary queue. This and other complex tasks are
described in more detail in Section 4.
3.3 I N P U T / O U T P U T PORT CONFIGURATION
A set of local commands are available to the user to allow for the control of the user-
defined circuit through the twelve I/O ports available. This section describes the control
of these lines.
The 7064 breadboard has twelve 8-bit ports. Each Port can be individually configured
for
input or
output. Three lines are supplied for the user to control the type of port and
its operation. The port outputs are designed to accept a 14-pin dual-in-line connector for
the user to easily wire into the breadboard area.
3.3.1
O u t p u t Port Reset Polarity
All outputs are set to a known level during reset. T h e user can select whether all the
outputs will be set to a logic 1, or all outputs will be set to a logic 0 by simply doing the
following:
3-1
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