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2.2-17-2. I/O Map of MTM
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D~_!;.!;ri~t~o.~j'--
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Addr.
,;=eo--
3B4
68B45
in~ex, re:grste'L~~
-
3B5
68845
jrata
Jeglst~r
3B8
CRT Control
regi~ter
c·
.
!
3BA
CRT
Stantus
regi$ter
' *
CRT Control Register
i
I ,------------. __ •• _______ _
This write only register is used -to--control the MTM. _
Table 2-23jrG"Rli
control' regTstEifJ-';ib
~b-\in
i','
li:-;I
'-;-I/7,;O:-:-:)C",r:"~lC~~. ,"';."T~".-j"J"'.7';,':')
-c __ ":-_-:
~-~..,,~.;-, "'''~;-.'';
,""
-."ee, n-,",:";
s-·,....., -
'~·t <>~~
Bit
CRT control registe~'
2 ' - -'
Add ...
.
.;"'"-'\
____ .J" /
"'3-S8
r,,";
--.1":0
T_,i
I
..
0-->'
,'j;" ';)'"
'I, .," ,-;;
"'-17!: I
'~'-_;J
J ,;"
_11,; ') ;'l,.-j
r
'~n
;;1
T,;~:j;';'/ ,::J3j'='3~
;,8;:;'i]
!-i,iT nl.,u'il
r;'~:'!
.-,;'; :
I, A;
~,-ji;):;'!:,q
j; .
;';,t;.w;::n 31
,' ' l l-iiG
i:
iT
,)J
n1;
i: _,
i :,'
iy)'! :_:1 ,
''1
:0,
te)
0\:10,fi:J'~:-:~;i,' ;,-ilbi; ,>S>;2'.;3:i.;:-_~;;';'i-.1,~:Ji.,:.!
j:)'-,,:J--'-ji
0-:""',,'::
3
Video enal;l!e;-;
;'1
;;)1.',"
'i'l1 :.:'.[
f ;':
'-!-
10 ':
:
3c!:~y-Jl
(:.
n.~41
';1)
Fkl'll ;)',0.0')1
~--!;,
j'!;
'::I~i :';{~rJ_
,li -,
,I
,1 ;l;;i:l:y-,li-;i ,-) ]j I
i~';j :
'-'SlrriR:
enabT~k:H'11
. ;
iJi
i.,
, ,
~:
! ,j -
'l i; , ;',
,r:'i
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___ ;
!''-;~:,I
1. '-'
_II;; ,,' -l,"
",'/'1,1_,
J:.,_.,
I.ill .. ,)""
.lrl:
'4~':~~~~~~y~~~~:~?is; u~~~d; t~ :ci~~dk lig~"'~+M:"f-~a!l i'~, ~~'~J~her
the H-sync or BIW video signal is output or
Hot
' d an
b'e"judgscf
via
this register
:-,;])-:_-:1) ....
Table
6ig4.
CRT ~ta~ya regisf~.r
--- Bit! . :,6~s~'ripti6~---
,'11;.,
;1:,,'
1
I
""l
l
-"')~
'-i'
'l,n 2
om'
. , , '
3
, H.,:
sync,
, '-,1
,
,
,,-
i
,_
\
J
:
2;Z17
2
3:'i/o
11118'of
C G M '
Th~:t~bl~j6~:I\b"" ~hd2~"t~'e
lib
addre,~s
assi
g
hmentS'9f
t~e
¢Grl
I ,
.
Tabl9
2·25.1/0
rriap of qGM .
,
I/O"
Description
A'ddr::;,J"
,
"
3D4
68B~5
Index,ireg'_lsterl
305
6884,5 Data
~egi,~~er
,
3D8
Modk selectj
Re~1'ste:~
,
3D9
Color Select;
Re_~iste~
3DA
Stat~s
Register
,
*Mode Select Registel;,
This _ _ 6~bitwrite ,only- register-is- used
Jo_
dejem:TJi!le_tb,e_display mode
·and,brinking attributeofJheCGM,
" " " ' , , ,
I' "
.I'·r:
I ----
.
- -
-----,
---~
"
j
-T
-,
"T~b1ei2-=26.
-Mode seJect
_[egis.~eJ
,
I/O:
:
Addr.1
Bit
i
Description
3D8
I
0
H:
80 x 25 Text Mode,
L:
40 x 25 TeX:t ',Mo\:le,
I
~:
'
.
"
1
Graphics Mode,
L:
Text Mode
,
' I '
i
2
~~Iack(!~_ite
Mode,
t:
c~lor
_ Mod? I
I' -
j
H: Enable VIDEO·Signal~--C-DisabTe-V.IDEO Signal
,
"
'.-4
H:.
640 x 200 Black/White Graphics MQde
I"
.';
-
-----
- -.- - -.
--------,
- __
_
,
_
_J.'
5
Hi
Chan_g~
-
~,?lckg.round
intensity to blinking attribute
Table 2-27. Bit assignments
I
-J~
)
,
0
\
Mode
! __ ' _ ___
~_
... ;:;.=:
Bit
-
--~--- ~
b=::: :-.-_
--5-.. ____
4..-::....:
;:,=i--I--2-- __
l--
80x25
(MONO.).'l'''''
0
~I~~,::r
0
1
1
'J,'
.,_(COLOR)
1
0
1
0
0
. _!Q.,x 25
i
dM.w~L
__
.Lr-.!!. ___ L
-1 ...
..9.
(9,OLOR)
' 1 ' "
0
1
],
320x200 (MONO.)
X
0
1
(COLOR)
X
0
640X200
X
0 r
)--"
\
-.,
~~.J~
' .
* Color
~eli;JCt
Register
,
This 6-bil write only register is used to determine the selection of
screeh cblo,rs_foLtbe_GGM __________
"j
:_____
)L',-
L.
U'J
Table 2-28. Color select register
,.J
..
; __ : : J-
T _'" T-:::':',-,",-::,
_:-T _,.
• -
I
)/d~'
Ad~r.
--:'3'D-9 --
o~"
i
'·~'ru~
1
e,'
,
'_I'
1,',\1<
c,',
:;--T--~;---,-
; )
--j---~'
-j---:l"
f~--';}f"
" . . 1
1
!
--2-
: Green
-'Red-
,}'h~s,~,
bits
'.~ele~~,
tre" ,?order colo'r in
. --text-mOde,
Jjadkgfound~Golor-in_320-x.200
3
Intensity;'~,'
)~mode .o~ fo~e~r~~nd,i~ol~~,.ml ~~~:'~lZ00
Select background color in text mode or intensified
s~t'l'~f' tdrMilin;:~N~~hi~s)ri,dd.'e.
Select color set 0 or
1
in 320 x 200 mode
When this bit is set to
1.
the color set
1
is selected.
When this bit is set to 0, the color set 0 is selected.
Table 2~29J1Ctilor combinations
,'," I
'
COLOR
:,\i
'.
",
;
~¥j
.:;1-::'"
,
I
R
G
B
,
BLACK
(,
"
..
0
0
'BliJE'
0
1
GREEN
':,1
,.
0
CYAN
b
0
RED":
_
....
,
-
_~
_1',.'
0
MAGENtA
:?i '.
0
1
BROWN
,
:'/
'0
0
WHITE
j'j
J;',:
!;\
J;, -,
..
0
GRA'y<
:'.1;
I:',"
,)
1
0
LIGHT BLUE
,
,1-,
0
LIGHT GREEN
l'
0
LIGHT CYAN'c,]' ;
,
',jl
LIGHT RED>"JN"
"
,
>1
1
LIGHT 'MAGENTA!"
'!~'
:
YELLOW'
- -;,
j)l'~:,::f.
WHITE '(HI.cINiTENiil'rvjL
:
,
')-!".
:
I
; i:;
---
--------_.-
Table 2·30.
Colori's'etstaole'
CO
C1
COLOR SET 0
COLOR SET 1
R
G
B
R
G
B
0
0
Background color specified by Color Select
Register
0
1
0
1
0
0
1
1
1
0
1
0
0
1
0
1
1
1
1
1
0
1
1
1
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