IBM RT Series Hardware Reference Manual page 45

Description
The high resolution IBM Monochrome Display connects to the
system unit through two cables. One cable is a signal cable from
the display adapter to the display, and the other provides power to
the display from the system unit. This arrangement eliminates the
need for a wall outlet and allows the system-unit Power switch to
control power to the display. The display unit has a 28.3 cm
(11.5 in.) diagonal, 90° deflection cathode ray tube (CRT). The
display may be placed on the system unit or on a nearby table or
desk. Brightness and contrast controls are on the front surface
and are easily accessible to the operator.
The characteristics of the display are as follows:
• Screen
- High-persistence, green phosphor (P39).
Etched surface to reduce glare.
Presentation of 80 characters wide by 25 rows deep.
Characters are defined in a 14 PEL-high by 9 PEL-wide
matrix.
• Video Signal
- Maximum bandwidth of 16.257 MHz at -3dB
• Vertical Drive
Screen refreshed at 50 Hz with 350 lines of vertical
resolution and 720 lines of horizontal resolution
• Horizontal Drive
Positive level, TTL-compatibility, at a frequency of 18.432
kHz
Monochrome Display 1