DEC VT220 - Page 108

193A H!OB3A H
194 A H!094A H
195A HI095A H I-----{
196A HIOBBA H
197A HIOB7A H
198A H
lB9A H:099A
19AA H/09AA 14
198A HIOBBA H ;;.....----1
1geA H/0geA H
190A HIOSOA H
I HIOSEA
ISEA HIOSE,A
ODD EVEN
SCAN LINE CAM LINE
ADDRESSES 10-311 ADDRESSES
~~~~
100A KIODOA H
102 A H/002A H
103A HI003A H
104A H/004A H 1048 HI0048
105A HI005A H 1----1.-~ 1058 H!0058 H
10M H!OOSA H 1068 H/0068 H
l07AH/007AH Ii} 107BH/007BH
108A HJOOSA H 10SB H
10BA H!ODBA H
10AA HIDOAA H 1-----1
lOlA H/OO1A H
Figure 6-20 Character ROM Map: CRM0-31
6.2.5 Attribute Circuits
The attribute circuits outpu
considered in processing each
line of a character is ou
attributes associated with
attribute circuits by the
generator, are output to
circuits.
the attribute control values to be
character for display. As each scan
t from character generator,
t character, as loaded into the
line buf r RAM in the character
v eo ou and video converter
The attribute circuits
components.
(Figure 6-21)
consist of the following
•
Attribute latch
ATR/CHR going
next character
loading.
2 -- latches character generator input at
high to provide attribute value for the
to be processed to attribute latch 3 for
•
Attribute latch 3 -- loads
latch 2 on leading edge of
enabled or disabled by
from 2681 DUART).
attribute value from attribute
T5 L (blink attribute input is
being gated with BLINK H input
6-24