Service Model
8903B
HP
9825A
(HPL)
0:
fxd
0
1:
rem
728;
Ilo
7
2:
wrt
728,
“60.SP“
3:
red
728,A
4:
dsp
A;
jmp
-1
5:
end
Table
8-3.
Key Scan Programs
HP
85A
(BASIC)
10
FIXED
0
20 REMOTE 728
30
LOCAL LOCKOUT 7
40
OUTPUT 728;
“60.SP“
50
ENTER 728;
A
60
DISP
A
70
GOT0
50
80
END
61.N
Display
HP-IB
Status.
Displays the status
of
the HP-IB lines selected by N. The display is in binary. See
Service Sheet
19
for troubleshooting and
a
complete list of HP-IB mnemonics.
NOTE
Binary representations of the information in pointed brackets appear
on
the Audio Analyzer’s
displays.
N=O
Displays
<0>
in
the left display and <Addressed
to Talk>.<Addressed to Listen> in the right display. This function reads back and displays the present
state
of the Talk and Listen Address Flip-Flops (A9UlA
and UlB). For example,
if
the displays show
1
and
0,
the Audio Analyzer
is
addressed to
talk
(and is
unaddressed
to listen). This means the Talk Address Flip-Flop
is
set (and the Listen Address Flip-Flop
is reset).
N=l
Displays
<O>
in the left display and <DAV>.<RFD><DAC> in the right display. This function reads
back and displays the present
state
of
the three bus handshake lines. <DAV> reflects the
state
of
the Data
Valid bus handshake line
as
being driven by the Audio Analyzer (l=being driven; O=not being driven).
Thus, when in Listen Only, this display
will
always show
0
for <DAV>. The <WD> and <DAC> always
track the bus lines Ready For Data and Data Accepted. For example,
1
for <RFD> means line Ready For
Data is true (high).
N=2
Displays
<0>
in the left display and <ATN>.<REN> in the right display. This function reads back and
displays the present state of the ATN (Attention) bus control line and the
state
of
the Remote Enable
Flip-Flop.
A
1
for either <ATN>
or
<REN> indicates ATN
is
true (low at the bus)
or
that the Remote
Enable Flip-Flop
is
set.
N=3 Displays
<O>
in the left display and <SPM>.<SRQ> in the right display. This function reads back and
displays the state
of
the Serial-Poll Flip-Flop and the state
of
the SRQ bus control line
as
being driven
by the Audio Analyzer.
A
1
for either <SPM>
or
<SRQ> indicates the Audio Analyzer
is
in serial-poll
mode
(SPM)
or that it is presently driving the SRQ bus control line.
N=4
Displays PI0 Port
A
with the most-significant
bits
in the left display and the least-significant bits
in
the
right display. This function inputs and dispIays (without modifying) the
data
at PI0 port
A
(A9U18).
Leading zeros in both displays are blanked. The display
is
interpreted
as
shown in Table
8-4.
N=5 Displays
PI0
Port
B
with the most-significant bits in the left display and the least-significant bits in
the right display. This function
is
similar
to
Special Function
61.4
except
PI0
port
B
is
displayed. The
display
is
interpreted as shown in Table
8-5.
N=6
Displays the HP-IB
Status
Register with <SPM>
<STSO>
<SRQ> <LLO> in the left display and
<REM> <ADRSD> <TRIG> <HOLDDELAY> in the right display. The status register
is
contained
in
RAM.
8-14
reu.2OJUN87
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