Raytheon DIDS-400 Series Technical Manual page 20

DIDS-40Z-ZAMI3
l-Z.5 Delay-Line Electronics A9
The delay-line electronics board (see figure 1-5) consists of two identical
read-write amplifier circuits. These amplifiers amplify data coupled to and
from the delay-line sections to compensate for any delay-line attenuation
encountered by the data bits.
l-Z.6 Delay Line Al5
The delay line (see figure 1-5) functions as an internal memory device
for storing up to 1040 seven-bit data characters and retrace characters. Data
characters circulating in the delay line are used to refresh the screen presen-
tation every 16 ms (refresh-memory loop). The delay liI).e also provides a
storage capability for holding data characters during message composition for
later transmission to the CPU.
Delay line A 15 consists of two magnetostrictive delay-line sections which
are series-connectedbetween the read-write amplifiers on delay-line electronics
board A9. The 1040 maximum character storage capacity (plus retrace)
corresponds to the maximum number of displayable characters on the display
terminal CRT screen.
l-Z.7 Monoscope Deflection Amplifier Assembly A3
The monoscope deflection amplifier (figure 1-4) is used to convert digital
codes to analog voltages for positioning the monoscope beam to a specific char-
acter. Seven-bit digital codes are coupled from the display logic board and con-
verted to produce two analog voltage outputs. These analog voltages are then
amplified and applied to X and Y deflection plates for electrostatically deflecting
the monoscope beam to a specific character on the monoscope target.
l-Z.8 Monoscope VI
The monosGope (see figure 1-4) provides a means of developing visual
characters for display on the CRT screen. The monos cope font consists of
96 individual characters (numerals, letters, and symbols) which are etched onto
the face of the monoscope. The electron beam is directed to a character by
means of X and Y deflection voltages developed by the deflection amplifiers.
As
the beam scans a character, an output is produced by secondary emission. This
video signal is then amplified and applied to the CRT for display.
l-Z.9 Video Preamplifier A7
The video preamplifier circuit (figure 1-6) accepts relatively low-level
video from the monoscope target and amplifies this video to a level suitable for
driving the video amplifier ..
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