Filter
Top Products
MZ3500
4-10. Character
VRAM
select
circuit
The
signal
BLNK
is
used
to
address
the
ASCII
RAM
within
address
area
of
0000-07FF
in
transferring
the
display
data
from
the
VRAM
to the CG.
Lov
0
*/
when
300^07FF
6 1 1 6(
2K*8)
ASCB
CS
V-RAM
*0000
-07PF
2114(!Kx4)
First
half
of
attribute
2114(1K*4)
Latter half
of
attribute
*0000
-03FF
#0400
-07FF
#0000
-07FF
BL'SC
BLNK
Erase
signal
H-SYNC
TT_
TTJ
Period
that
the GDC is
enabled
to
read/write
and
draw graphic data.
BLANK
[Circuit
description]
With
respect
to
GCD1,
the
assignment
during read/write
of the
character VIDEO-ROM
is per the
table below.
The
character
VRAM
select
circuit
is
provided.
Jo
accomplish
this
function.
6
I 1 6 >
2K»8
)
ASL C
V-KAM
Latter
half
of
attribute
First
half
of
attribute
t
ARIO
= H1
T
AK10
= Low
*07FF
*0400
#03KF
toooo
8bil
-
47
-