50
or
60
Hz
CRT
Ac
line voltage
is
either
50 Hz
or
60 Hz. A
monitor's
vertical sweep frequency
may
cause display
flicker if
an
incompatibility exists between
the
ac line frequency
and
the
vertical sweep frequency.
These options
permits
the
user
to
set
the
video
board
for
the
local line voltage frequency.
The
50/60
Hertz
CRT
options are only available
with
non-bit-mapped
video cards.
With
one
of these
cards
installed, if m
or
rn
is
pressed, a soft override of
the
power-up
CRT
frequency
occurs.
The
power-up
CRT
frequency of
the
HP
98546 Display Compatibility Interface is deter-
mined by a
switch on its video card.
When
this
switch
is
set
to
0,
the
power-up default
is
60
Hz, when
this
switch
is
set
to
1,
the
power-up default
is
50 Hz.
If
m
or
rn is pressed during
configure mode when
there
is
both
an
alpha/graphics
video
card
set
and
a bit
mapped
video
board
present,
then
the
key pressed will effect
the
alpha
display (even
though
the
'5'
and
'6' are
not
displayed).
If
no
alpha/graphics
video
card
set
is
present
and
m
or
rn
is
pressed,
the
Boot
ROM will re-enter self test,
but
the
display will
not
be
effected.
An example Configure Mode display with
50/60
Hz information
is
shown in Figure 4-2.
r
Copyright 1985,
Hewlett-Packard
Company.
All
Rights
Reserved.
BOOTROM
Rev.
A
Bit
Mapped
Display
Keyboard
Graphics
HP-IB
HP98620B
HP98644
at
2
HP98625
at
8
HP98629
at
20
524128 Bytes
CONFIGURE
MODE
RESET
To
Power-Up
KEY
ACTION
T
Extended
Self-Test
L Continuous
Self-Test
Loop
6
60
Hz
CRT
5
50
Hz
CRT
Figure
4-2. Configure
Mode
Screen Display
with
50/60
Hz
Information
76
Boot
ROln
Functions
1H
"""
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