•
CRT
Status Port
(I/O
Address '3BA')
Bit
Function
o + Horizontal Drive
1 Reserved
2 Reserved
3
+B/W
Video
IBM
Monochrome Display
The high resolution IBM Monochrome Display unit attaches to the
System Unit via two cables
of
approximately
3'
(914 mm) in length.
One cable
is
a signal cable which contains direct drive interface from
the IBM Monochrome Display and Printer Adapter.
The second cable provides AC power to the display from the System
Unit. This allows the System Unit power
ON/OFF
switch to also
control the display unit. An additional benefit
is
a reduction in the
requirements for wall outlets to power the system. The monitor
contains an 12" (305 mm) diagonal 90° deflection CRT. The
CRT
and
analog circuits are packaged
in
an enclosure so the display may either
sit on top
of
the System Unit
or
on a nearby table top
or
desk. The unit
has both brightness and contrast adjustment controls on the front
~
available to the operator.
Operating Characteristics
Screen
High persistance green phosphor (P 39) with an etched surface to
reduce glare. Unit displays an 80 character by 25 line screen with a
9 dot wide by 14 dot tall character box.
Video Signal
Maximum video bandwidth
of
16.27 Mhz.
Vertical Drive
Screen refreshed at 50 Hz with 350 vertical lines
of
resolution and
720 lines
of
horizontal resolution.
~
Horizontal Drive
Positive level
TTL
compatible frequency, 18.432 Khz.
2-43
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