Sharp MZ-800 Service Manual page 26

MZ-800
4-2-8. Pallet
• As there are four 4-bit pallet registers provided inside
the unit, it permits choice of R, G, B, and I combina-
tions, and it enables to make choice of any desired
two or four colors out of sixteen available colors.
However, in the 320 x 200, 16-color mode, choice of
colors permitted to four kinds of colors output of
sixteen.
• Only the conventional mode is applicable
MZ-700 mode without using pallet.
for the
• Pallet is not applicable for the border color.
<Configuration>
Pallet
enable
SWitch PLTO PLTl PLT2 PLT3
DB;
SW; Bo
B,
B, B,
~I~~:;PUI
--0 :
B output
DB,
0
Ro
R, R, R,
~
SW,
~
~
~~~~;~ut
---0
~
R output
f
~
DB,
G; G,
G, G,
3
01
0
Plane III
~
G output
SA
output
--0 I
DB,
I
Plane 1\-
"-l.o-
I output
SA output
--0 :
So S,
Inpu! select Signal
A
B
Output select Signal
320 )( 200,
SWQ, 1 Plane III 1\
SR output
<Pallet output and display mode>
• Shown next is the relation of the display mode, color
plane data vs R, G, G, I outputs.
Display mode
4
color
320
x
200
16 colors
Pallet output select
Display color
A B
Frame A 4 colors out of Plane I Plane
n
16 colors data data
Frame B
4
colors out of Plane
ID
Plane
IV
16 colors data data
(Ex.)
16 colors out of
16 colors
Plane I
data
Plane
IT
data
<Pallet register write> (FO
H )
(FO
H )
MSB
OUT FO
H
I
x
S2
1) So - S2: Register section
S2
S,
So
0 0
0
0 0
1
-~-
- - -
- .
0
,
0
0
,
1
1 0 0
2)
Bi, Ri, Gi, li: Pallet write data
3) SW o , SW,:
LSB
Register No.
.-
PLT 0
- -
PLT'
- -
PLT 2
PLT 3
SW o • SW,
With these switches, it is possible to make combina-
tion of Planes ill and N data in the 320 x 200,
16-color mode. Switches are used to assign pallets to
four groups of colors.
(Plane ill data)
=
SW o , (Plane N data)
=
SW,
Only for the color information, the color information
set by the pallet register are available as B, R, G, and
I outputs. For color information other than that, data
in Plane I through Plane N are sent out as the B, R,
G, and I outputs.
(See example next.)
Pallet enable
SW
o •
SW,
x
x
Output select
A B
Output Output Output Output
o o
Bo
10
o
B,
R, G,
I,
o
1 B3
o
o
Bo
I
Go 10
o
1 B2 R2 G 2 12
f----+-----+---4----- -----+-----1
1 1 B3 R3 G 3 13
(PI
ill )
0
0
Bo Ro Go 10
SW
=
ane
_+ __
----1
o data
( )
~ I ~_~-~-ti-:-:-+--:-:-~-~-'~--::~
I
SW = Plane IV
2
! '
data
I
! 1
I
1 B3 R3 G 3
I
13
~---------+--x-4-X-~-I--~-IT-+--ID---+-IV~
I
x
I
0_
x Bo Ro Go 10
Frame A 2 colors out of Plane I x
I
r---
~---~-1-6-co-l-or-s~-+_-d-a-t-a-+_---+I'~--------~~-_+-B-,_~-R-,_4-G-,-+--I-,~
I
x
I
O~i-x~--B-o_+-R-o-+_-G-o~~-lo~
2 colors
2 colors out of Plane
ID
16 colors data
Frame B
x
I
1I
I ,
x
B, R, G, I,
640 x 200
~-----4------+--------+--~-~-------+i------------+----~---+--~-~-------~----~
I
0 0
I
Bo Ro Go
4 colors out of Plane
I
-
16 colors data
4 colors
Plane
ID
data
25
10
1 0
I
B, R, G-,-+--I-,---I
x
!
1