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INTELLEC PROMPT
48
FEATURES
Single Component Compu.ter
The 8748 is
the
first
microcomputer
fully
integrated
on
one
component
. All
elements
of
a
computing
system
are
provided,
including
CPU, RAM, I/O, timer,
interrupts,
and
erasable, reprogram mabie
nonvolatile
program memory.
Programming Socket
PROMPT's
programming
socket
programs
this
revolu·
tionary "smart
PROM"-the
8748-in
a
highly
reliable,
convenient manner. A
fail·safe
interlock
ensures
the
device is properly inserted before
applying
program-
ming pulses. Each
location
may be
individually
pro-
grammed,
one
byte at a time. A read-before-write
programming
algorithm
prevents
device
damage by
inadvertently
programming
unerased memory.
MCS·48 Processors
The
execution
socket
accepts
either
an 8035
or
an
8748
MCS-48 processor. Both are
supplied
with
each
PROMPT
48
, and
either
can serve as heart
of
the
PROMPT system. There are no
processors
within
the
PROMPT
48
mainframe,
which
instead
contains
monitor
ROM
and RAM, user RAM, peripherals, drivers, and
sophisticated
control
circuitry.
Once a
processor
is
seated in the
execution
socket
and
power
is
applied,
the
PROMPT
system
comes
to
life. Various
access
modes
may be selected such as program
execution
from
PROMPT system RAM, or
from
on-chip PROM.
Thus
pro-
grams may
first
be
executed
from PROMPT RAM
with
the 8035
processor
. When
debugging
is
complete,
the
8035 (execution socket)
processor
can program
the
8748
(programming socket) processor. Finally, a
programmed
8748
processor
.may be exercised by
itself
from
the
execution
socket. The
execution
socket
processor
runs
either
monitor
or
user
programs.
System Monitor
The
system
reset
command
initializes
the
PROMPT
system and enters the
monitor.
The
monitor
interrupt
command
exits
a
user
program
gracefully,
preserving
system
status
and
entering
the
monitor.
The
user
inter-
rupt
command
causes an
interrupt
only
if
the
PROMPT
system
is
running a user program. A
comprehensive
system
monitor
resides in
four
1 K-byte read
only
memories. It drives
the
PROMPT keyboard and
displays
and responds
to
commands
and
functions.
fhe
top
16
bytes
of
on-Chip program
memory
must
be used by
the
PROMPT
system
to
switch
between
monitor
and
user
programs. It requires one level
of
the
MCS-48 eight-level
stack
.
Commands
PROMPT 48's
commands
are grouped and
color-coded
to
simplify
access
to
the
8748's separate program and
data memory. Registers, data memory,
or
program mem-
ory, may be examined and
modified
with
the
examine
and
modify
commands.
Then
either
the
next
or
previous
register and memory
locations
may be
accessed
with
one keystroke. Programs may be
exercised
in three
modes. The
go
no break (GO NO BREAK) runs in real
time. The
go
with
break (GO WITH BREAK)
mode
is
not
real
time
-
after
each
instruction
the
MCS-48 program
counter
is
compared
against
pending
breakpoint!\. If no
break
is
encountered,
execution
resumes. The
go
single
step
(GO
SINGLE
STEP)
mode
exercises
one
instruction
at a time.
Commands
are
like
sentences
,
with
param-
eters
separated by
[i]
NEXT. Eadh
command
ends
with
[i]
EXECUTE/END. In
addition
to
the
PROMPT
basic
commands,
thirteen
functions
simplify
programming.
Each
is
started
merely
by
pressing
a hex
datalfunction
key and
entering
parameters
as required, as
shown
in
Table
1.
10-8
AFN-00352A-02