Sharp MZ-800 Service Manual page 24

MZ-800
b) Write format register (WR) (OUT
&
CC) • WMD 0 - 2 .....
Selects the logical operational mode for read-
modify-write .
• B/A (NOTE)
Standard MZ-800
--->
"0": Frame A access .....
• I, Il,
rn,
IV .....
Frame A is accessed for the display mode.
"1": Frame B access .....
Color plane designation
Frame B is accessed for the display mode.
Write
mode ' 2 1 0 IV ill IT VD : VRAM data
WMD
B/",:
Color plane Function [WD: Write data
1
-SINGLE-- . +- 0 0
1
0
(*)
0/1
-~
0 / 1 -
-----lc~~~I-;ne of;;1~WD,
wri;---------
WRITE
~
320 x 200,
i
Color plane of "0": Fixed
o
r
0-
--t
r -
1 -
11
Frame A: 0
I
o~T, ~/~ +,1,'~/01,
-
4/16
colors jcolor
pl~~~--;:;-0Y-WD
<:BVO--------
OIl
I
640 x 200, ,Color plane of "0": Fixed
----t-- -
---j ,--
t---r-
--;1
I---~'
---------- -------.-------
o
I __
~
01 Frame
B: 1
:_~/~ .j,_~l_i_ 0~~0/1:
1/4
colors
ll~-:;~~;~~ ~:~~:::F~;
VD ______ _
0-1
I
1
I
, I
1
iColorplaneof"l":WD.VD
-,1 -~
-Iu=i=-
('F~::
i
;;;;:-;oo@,
!
:;;~~:~~';:f::~~,:::',:,O;--'
-------
I
r-~--.
_
0/~_+0/-1_·1i
_
x--~--~"li ~2~I:r~o~_~
(Character write to the graphic plane)
' L
x
I,
0/1
~
OIl OIl
i
OIl
I. . '
I Color plane of "1": WD
i
I , ,
16 colors
I
x
i_.
0 __
---l+I---x-i--lI----~--t~
!
0/~r~4~-=-;~
®,
1
Calor plane of "0": Writes "0".
i
I ___
~
__
J __ ><....t~~><_l_~l-~~olor ~
Calor plane of "X": Fixed
1
I
x
I
x
,011
I x i
OIl! 640
x
200, !
to-~~_---
I
~-t-~~
i
0/1
i
0/
132:
:o~:~s
®,
-r-~rites
only-bi.t "1
~:-~-;-~~ i;;~pecific
calor.
I
f--
1 ___
~
_9Q
.<>'~J.-~-'
x
-i--
~<:<>Iors ~
(Character write to graphic plane)
I
I
x
I
OIl
11
0/1
I
OIl T;1
I
3~~
x
1
200
,
I
Calor plane of "1": WD
+
VD
x
I
t'
I
co ors
1
r- -
"0--
-r -;-:--~- -;-1o~1 ~~~-;;-~®~-!
Calor plane of "0": WD· VD
r-
- - 1 - -
~
x
I
OIl
1
x
!
x
1 calor,
®
! Calor plane of "X": Fixed
I
I
i
--"'-r-- -
----r----t-------
1
EXOR
OR
RESET
REPLACE
PSET
o
,
I
MZ-700
1
0
o
x
i
x :
OIl
I
x I
OIl! 640
x
200,
11
__ +-_____
! _
1I 1I
I
I
4
~?Iors
. _____ _
o
0
I
0 I 0
I
0 I 1 I MZ-700 ' Writes WD into the DATA, ATB, and CG area.
(*)
Refer to Table-l display frame
NOTES:
• Write for the non-existing VRAM are not assured.
• The above parameter has to be set up for the MZ-700
mode.
• BI
A must be set to "0" for the standard version
MZ-800.
23