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CHAPTER 3
O.PERATION WITH THE MONITOR
3-1. OVERVIEW OF OPERATIONS
When the Eva1 uation Board is powered
up, the ROM-based Monitor program in-
i tail i zes the standard boal"d confi gur-
at ions ill ustrated in fi gure 1-3.
It
then displays an asterisk
(*)
prompt.
Immediately
thereafter,
any
Monitor
command
descri bed
in
the
fo 11 owi ng
pages can be entered, including the
command s that invoke t
hE~
Assembler or
up/down-loads from the AmSYS 8/8 De-
velopment System.
The Monitor will commun"icate with any
console in the standard configuration
(figure 1-3), although precedence is
always given to the keyboard/display
conso1e attached at the P4 edge con-
nector whenever it i s
prlesE~nt.
If the
AmSYS 8/8 Development System is at-
tached to P3, the Monitor will also
communicate with its console if the
HOST program is running on the Develop-
ment System.
When the keyboard/ di s-
play console at P4 plus the Develop-
ment System at P3 are attached, inputs
may be recei ved from both but outputs
from the board will go only to the key-
board/display console.
W·ith consoles
only at P3 and P6 (nothing at P4), the
first one to communicate with the Eval-
uation Board becomes the system console
and receives output.
The on-board memory space accessible to
the Monitor includes hex addresses 0
through 5FFF, as i ndi cated in fi gure
3-1. Both the Monitor and the optional
Assemb1 er a1 so use up to 100 hex bytes
each of RAM starting with address 4000
for the system stack and working stor-
age at various times.
If the P3, P4 and P6 edge connectors
are used for non-standard I/O (i.e.,
any way other than that illustrated in
fi gure 1-3),
or if the P5
connector
is used, the I/O ci rcuits control 1i ng
these connectors must be reprogrammed
after initialization by the Monitor.
The
Peripheral
Programming
chapter
discusses the methods for doing this.
Since the 1ine-by-1ine Assembler is an
option with the Evaluation Board, a de-
scription of it is given in a separate
manual entitled Am96/40l6-ASM Assembler
User1s Manual.
3-2. MONITOR FUNCTIONS AND
USER CONTROLS
The Monitor allows you to perform the
following functions:
Examine, fill or substitute memory
locations
Examine or fill CPU registers
Execute a program start i ng at any
location
Single-step through a program
Specify breakpoints
Call the 1ine-by-1ine Asssembler
Initiate and manage up/down loading
from
the
,ArnSYS
8/8
Development
System
There are two sets of operat i ng modes
for the Monitor:
Normal/System Modes - These modes
differentiate between the abilities
to execute protected and privileged
AmZ8000 instructions, respectively.
The Monitor always
comes
up
in
Norma1 Mode; any hex or As semb1er
instructions can be entered, but
3-1
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