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M23500
[Explanation]
C-COMMAND
CODE
) To A
p_
PARAMETER
'
Display
dot, specify
the
display
address
of the
VRAM
and
the dot
address.
Set the
command
code
of the SET
mode
(set
mode
plus CLEAR, REPLACE,
and
COMPLEMENT
modes
using
"WRITE",
and
specify
to
start
with
"VECTE".
Dot
address
is
structured
on the
screen
in the
following
manner.
Address 0001
dAD=
0 1 2 3 1 5 6 7 8 9 10 11 12 13 14 15
[Dot
display
program example-1]
LD
LD
INC
LD
INC
LD
INC
LD
INC
LD
INC
LD
HL
(HL)
L
(HL)
L
(HL)
L
(HL)
L
(HL)
L
(HL)
.5000H
.
49H
,01H
,
OOH
30H
,23H
,
6CH
CSRWdata
5000
— 49 H
5001
— 01 H
5002
— 00 H
5003
— 30 H
5004
— 23 H }
WRITE
data
5005
— 6CH }
VECTE
data
LD
LD
LD
C
,60H
B ,4H
HL
,5000H
C — BOH
(port
address
during
graphic draw)
B
-
Byte
size CSRW data
HL
- Top
address
of the
CSRW data
CALL
GDC
Command,
parameter
of
CSRW
-
GDC
LD
LD
LD
C
,60H
B
, 1H
HL
.5004H
B
-
Byte
size
of the
WRITE data
HL
- Top
address
of the
WRITE data
CALL
GDC
Command,
parameter
of
WRITE
- GDC
LD
LD
LD
C
, 60H
B , 1H
HL
.5005H
B —
Byte
number
of the
VECTE
data
HL
- Top
address
of the
VECTE data
CALL
GDC
;
Command,
parameter
of the
VECTE
- GDC