Sharp MZ-3500 - Manual (Page 45)

MZ3500
[Explanation]
C - COMMAND CODE 1 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
XI
dAD= 0 1 2 3 t 5 6 7 8 9 10 11 12 13 14 15
[Dot display program example-1]
LD HL , 5 0 0 0 H '
L D ( H L ) . 4 9 H 5000 ^ 49 H
INC L 5001 — 01 H
CSRWdata
LD ( H L ) , 0 1 H 5002 ^ 00 H
I NC L 5003 — 30 H
LD ( H L ) , О О Н 5004 23 H } WRITE data
1 NC L 5005 — 6CH } VECTE data
LD ( H L ) З О Н
I N C L
L D ( H L ) , 2 3 H
I N C L
L D ( H L ) , 6 C H -
1
L D
1
C , 6 0 H C — 60H (port address during graphic draw)
LD В , 4H В — Byte size CSRW data
LD HL , 5 0 0 0 H
1
HL — Top address of the CSRW data
CALL
1
GDC
1
Command, parameter of CSRW — GDC
LD
1
C , 60H
LD В . IH В — Byte size of the WRITE data
LD HL . 5 0 0 4 H
1
; HL — Top address of the W R I T E data
C A L L
1
G D C
1
Command, parameter of WRITE - GDC
LD
1
C , 60H
LD в . IH ; В — Byte number of the VECTE data
LD HL , 5 0 0 5 H
1
; H L — Top address of the VECTE data
CALL
1
GDC ; Command, parameter of the VECTE — GDC
SO