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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
d A D = 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 } W R I T E data
5005 — 6CH } VECTE data
LD
LD
LD
C
, 6 0 H
B
,4H
HL , 5 0 0 0 H
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
, 6 0 H
B
, 1H
H L . 5 0 0 4 H
B - Byte size of the WRITE data
HL - Top address of the WRITE data
CALL
GDC
Command, parameter of W R I T E - GDC
LD
LD
LD
C
, 60H
B
, 1H
HL . 5 0 0 5 H
B — Byte number of the VECTE data
HL - Top address of the VECTE data
CALL
GDC
; Command, parameter of the VECTE - GDC
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