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CHAPTER 1.
INTRODUCTION
The IBM 3205 Color Display Console is a seven-color (using only four colors),
display console that consists of three units:
video unit, logic unit, and keyboard
unit.
Figure I-Ion page 1-2 shows the individual console units, and Figure 1-2 on
page 1-3 shows the IBM 3205 prepared for normal operation.
The IBM 3205 is available in one model and has a 122-key typewriter keyboard (or
124-key Japanese Katakana keyboard).
No optional features exist.
1.1 VIDEO UNIT
The video unit, which connects to the logic unit by a cable, has an analog card,
power-supply assembly, and a 14-inch, high-resolution, cathode ray tube (CRT) that
can display up to 1920 characters (24 lines of 80 characters).
Seven colors (blue,
red, green, turquoise, pink, yellow, and white) can be obtained by combining the
three primary colors.
The display surface has an operator information area (line
25) that is separated from the remainder of the display image by a horizontal line.
The power supply in the video unit generates +12 V dc, +5 V dc, and +88 V dc, and
supplies +5 V dc and +12 V dc to the logic unit via the video cable.
The +12 V dc
is used for the audible alarm on the logic card.
The +88 V dc is used in the video
unit.
The video unit has a brightness control knob, a power on-off
(I
0) switch and a
power-on indicator.
For operator convenience, a pedestal makes it possible to tilt and rotate the video
unit.
1.2 KEYBOARD UNIT
The IBM 3205 keyboard unit has a 122-key typewriter keyboard (or 124-key Japanese
Katakana keyboard).
The keyboard contains other special-function keys.
Some keys
are typematic, that is, they will repeat their function for as long as they are held
down.
There are two types of keyboards:
•
•
Membrane type (new type)
Capacitance type (old type)
Membrane-type keyboard has a plastic bottom-cover.
Capacitance-type keyboard has a
metallic bottom-cover.
Both types are functionally the same and plug compatible.
The keyboard unit connects to the logic unit by a cable.
C:
1.3
LOGIC UNIT
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The logic unit provides controls for the other units.
It has a logic board and a
security key.
It has cable connections for the video unit, keyboard unit, and a
host processor.
The logic board contains the Test/Normal switch, Monocase/Dualcase switch, color
switch, audible alarm, and status light.
Chapter 1.
Introduction
1-1
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