Ibm Monochrome Display; Operating Characteristics - IBM 5150 Hardware Reference Manual

• 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 ofthe 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.
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