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Crtc Register Map - Sharp MZ-800 Service Manual

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(Ex.)
An example of the pallet in use in the 320 x 200,
16-color mode
• Assume that the pallet register has been set to the
following.
l
PL TO
=
Black
PLT1
=
Cyan
PLT2
=
Red
PL T3
=
Magenta
• When SWo is set to "0" and SW, to "0", the pallet is
applied to four colors in group 1 (ill
=
0, N
=
0) and
it results in the color as shown in
CD
of the table right
(yellow to cyan).
• When SWo is set to "0" and SW, to "1", four colors
of group 3 (ill
=
0, N
=
1) becomes the display color
set by the pallet.
• Therefore, any color can be chosen out of 16 colors
against four colors of color group selected by SW1
and SW2.
• For group other than selected by SWo and SW" the
color that
I -
N outputted on B, R,
G,
I is displayed.
c.
Plane data
' "
e
Cl
I
II
ill
N
0
0
0
0
~
c.
1
0
0
0
' " e
0
1
0
0
Cl
1
1
0
0
0
0
1
0
N
1
0
1
0
c.
' "
0
0
1
1
0
l5
1
1
1
0
0
0
0
1
M
1
0
0
1
a.
' " e
0
1
0
1
Cl
1
1
0
1
0
0
1
1
. .
1
0
1
1
c.
' "
0
0
1
1
1
l5
1
1
1
1
Border color
MZ-800
Display color of
SWo = 0
SWo = 0
1- N ..... RGBI
SW, = 0
SW, = 1
Black
PLTO
=
Bleck
Black
Blue
PLT1
=Cyen
Red
PLT2
=
Red
Magenta
PL T3 = Magenta
Green
+-
+-
Cyan
+-
+-
Yellow
+-
+-
White
+-
+-
Gray
+-
PLTO
=
Gray
Light blue
+-
PLT1
= ~\~~t
Light red
+-
PLT2
=
~~ht
Light magenta
+-
PLT3 -
light
- magenta
Light green
+-
+-
Light cyan
+-
+-
Light yellow
+-
....
Light white
+-
+-
• As
the CRTC has a 4-bit border color register, it
permit to use any border color out of 16 colors.
4-2-9. CRTC register map
• VRAM control
• Data display on the video screen
Control I/O address map
1/0 address
- -
H
l
IN/OUT
(B)
(C,
*)
---
CC
0
---
CD
0
---
CE
0
---
CE
I
--
- - - - - - - - -
--~-
01
CF
0
02
CF
0
03
CF
0
04
CF
0
05
CF
0
06
CF
0
07
CF
0
~
FD
0
• Border register (OUT 06CF
H )
MSB
LSB
BCOLI~
__
X __
~
__
X~~
__ X __
~
__
X~~
__
-L __
G __
~
__
R~I~_B~
• B, R, G, and I becomes "0" (black) when reset.
Write format register (WF)
Read format register (RF)
Display mode register (DMD)
Status read
Scroll offset register l (SOF1), 8 bits
Scroll offset register R (SOF2), 2 bits
Scroll width register (SW), 7 bits
Scroll start address register (SSA), 7 bits
Scroll end address register (SEA), 7 bits
Border color register (BCOl), 4 bits
Superimpose bit (07) (CKSW), 1 bit
Pallet register
26
Written by indirect
OUT command.
B register
<-
0-7
QUT(C),A

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