A-26
HP 9895A Disc Memory
Command
Set
Download
Type:
Purpose:
Description:
Control.
This
command
allows the downloading
and
execution of
MCC or
Z80
code
into the controller's internal
RAM
mem-
ory. It is
intended
for diagnostic purposes only,
and
as such
should
be
used with care.
After receiving the download secondary,
up
to
256
bytes
are stored in the controller's
RAM
memory. Following the
reception of the last byte, the code
will
be
executed start-
ing at the first byte
if
the controller processor
is
an
MCC,
or
starting
at
the third byte
if
the controller processor
is
a Z80.
HP-IB Sequence:
ATN
rOl~DDRSI
Primary
Listen
Download
ATN
EOI
P
?
PllOEE
P
?
I
Secondary
I
D
?
+-
1
to
256
Bytes
--+
NOTE
Updating
of
status
and
the operation
of
parallel poll
is
dependent
upon
downloaded code.
ATN
I
POlll1ll
I
Unlisten
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