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M
7
3500
2)
Read/write
from
Z 80 to
VRAM
(1)
Timing
period
for
display
and
V-RAM
Read/write.
//><-'
Range
wh°r?
GDC can
draw.
H •
SYNC-
BLNK-
J
(2)
Timing
that
the
Z-80
can
read/write VRAM
The
Z-80
can
read/write VRAM when
GDC
FIFO
buffer
is
either
empty
or
Full,
and can be
accessed
by
3)
Structure
of
character VRAM
(1)
When read/write
from
GDC
#07FF
#0000
(A)
2KX8
ASC I I
8bi t
4bit
DO
"D7 V&
«-Dll
Fly
back
period
refreshing
during
the
display
period.
Number
of
characters
that
can be
read/write
within
one
raster
in
any
mode.
(A)
(B)
ASCI
I(8bit)
(
12bit
)
DO
Dl D2 D3 D4 D5 1)6 D7
DO
Dl
D2
D3
•
Blink
Reverse
(G)
Vertical
line
(R)
.
Horizontal line
(B)
(2)
During display
#07FF
#0000
(A)
2KX8
(B)
2KX4
12bi
t