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-
M Z3500
4-10. Character V RAM select clrcu it
(,!lC- I
A))O
)
\!ll I
BL~K
H· Address
latch
RAS
CSP-2
BeSe
I
The SIgnal BLNK IS used to address the ASCII RAM
Low when
6116(2K x 8)
110000
-07I'F
w,th,n address area of 0000-07FF on tlanslerrong
0OOO-07FF
ASC[J
the d,splay data from the VRAM to the CG.
CS
r -
\1; I I
~
\RIO
f-I
'---
BLNK
~07l-F
(
,,1;11
HI \;"
Erase Signal
V-RAM
::J
JJ-
-
\RIO
Low when
2114(IKX4)
~
0OOO-03FF
First half of
1000
CE
attribute
-03
ARIO
~
DAS
Low when
2114(IKx4)
I
l0400-07FF
;1'040
Latter half of
ARII
CE attribute
-07
~
Low when
vi
0000-07FF
LS245
#0000
.... GCharacter R/W
-07FF
H\'SG
~
~
Display
period
~
~
Perood that the G DC is enabled to read/wrote
:L
o
FF
o
FF
H-SYNC---11
and draw graph le data.
€116,2K'8)
A~La
\-1<'\11
BLA..'iK~
Latter half of
attribute
F orsl half
[Circuit description]
With respect to GCD1, the assignment during read/write
of the character VIDEO· ROM is per the table op.low. The
character VRAM select circuit is provided.
to dt-complish
this function.
i
f07FF
I
ARIO=HI
#0400
t
#031'1'
I
MIl
=
10 .....
fOOOO
01
attrobute
AHJO=Low
#0000
v
'-----r------"
8blt
4bll
- 47-
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