IBM
Personal
Comput.er
MACRO
Assembler
Version
2.00
VIDEO
----
01/10/86
VIDEO
DISPLAY
BIOS
ASSUME
CS:CODE,DS:DATA,ES:NOTHING
BX,
CX,
OX,
S I
,0
I
,BP,
SP,
OS,
ES,
SS
PRESERVED
OUR
I
NG
CALLS
EXCEPT
FOR
BX,
CX,
OX
RETURN
VALUES
ON
FUNCTI
ONS
03H,
04H,
ODH
AND
ODH.
ON
ALL
CALLS
AX
IS
MODIFIED.
5-63
;
TABLE
OF
ROUTINES
WITHIN
VIDEO
I/O
;
RESERVED
; RESERVED
; RESERVED
;
CASE
13H,
WRITE
STRING
VIDEO
(01/10/86)
SET
MODE
SET-CTYPE
SET-CPOS
READ CURSOR
READ-LPEN
ACT
01
SP PAGE
SCROLL
UP
SCROLL
-DOWN
READ
AC CURRENT
WR
I
TE
AC CURRENT
WR
I
TE-C
CURRENT
SET
COLOR
WRITE
DOT
READ
DOT
WRITE
TTY
VIDEO-STATE
V
IDEO-RETURN
V
IDEO-RETURN
V
IDEO-RETURN
WR
I
TE:STR
I
NG
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
OFFSET
S-Ml
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
OW
EQU
( AH) =
ODH
READ DOT
(OX)
=
ROW
NUMBER
(
CX
) = COLUMN NUMBER
(
AL
) RETURNS
THE
DOT READ
ASC I I
TELETYPE
ROUT I NE FOR OUTPUT
(AH
I =
OEH
WR
I
TE
TELETYPE
TO ACT I VE PAGE
(ALl
= CHAR TO
WR
I
TE
(BL
I = FOREGROUND COLOR I N GRAPH I CS
MODE
NOTE
--
SCREEN
WIDTH
I S
CONTROLLED
BY
PREV
IOUS
MODE
SET
(AH
I = OFH CURRENT V
IDEO
STATE
RETURNS
THE
CURRENT V
IDEO
S
TATE
(ALl
=
MODE
CURRENTLY
SET
( SEE ( AH I =
OOH
FOR
EXPLANA
T I
ON
)
( AH) = NUMBER OF CHARACTER COLUMNS
ON
SCREEN
(BH)
= CURRENT
ACTI
VE 0 I
SPLAY
PAGE
(AH
I =
10H
RESERVED
(AH)
=
11
H RESERVED
( AH) = 1
2H
RESERVED
(AHI
=
13H
WRITE
STRING
ES:BP
-
POINTER
TO
STRING
TO
BE
WRITTEN
CX -
LENGTH
OF CHARACTER STR I
NG
TO
WR
I
TTEN
OX
- CURSOR POS I T I
ON
FOR STR I
NG
TO
BE
WR
I
TTEN
BH - PAGE NUMBER
(AL
1=
OOH
WR
I
TE
CHARACTER STR I
NG
BL
-
ATTR
I
BUTE
STR I
NG
I S
<CHAR,
CHAR,
•••
,CHAR>
CURSOR NOT MOVED
(AL)
= 0 I H
WR
I
TE
CHARACTER STR I
NG
AND MOVE CURSOR
BL
-
ATTR
I
BUTE
STR I
NG
I S
<CHAR,
CHAR,
•••
,CHAR>
CURSOR I S MOVED
(
AL
) =
02H
WR
I
TE
CHARACTER AND A
TTR
I
BUTE
STR I
NG
(
VAL
I 0 FOR
ALPHA
MODES ONLY I
STRING
IS
<CHAR,ATTR,CHAR,ATTR..
,CHAR,ATTR>
CURSOR I S NOT MOVED
(ALI
=
03H
WRITE
CHARACTER AND
ATTRIBUTE
STRING
AND MOVE CURSOR
(
VAL
I 0 FOR
ALPHA
MODES
ONLY)
STRING
IS
<CHAR,ATTR,CHAR,ATTR
••
,CHAR,ATTR>
CURSOR I S MOVED
NOTE:
CARR I AGE
RETURN,
LINE
FEED,
BACKSPACE,
AND
BELL
ARE
TREATED
AS COMMANDS RATHER THAN PR I
NT
ABLE
CHARACTERS.
(AH)
=
OCH
WRITE
OOT
(OX)
=
ROW
NUMBER
(
CX)
= COLUMN NUMBER
(
AL
) = COLOR
VALUE
IF
BIT
7 OF
AL
=
1,
THEN
THE
COLOR V
ALUE
I S
EXCLUS
I
VE
ORed
WITH
THE CURRENT CONTENTS OF
THE
DOT
(CX)
= COUNT OF CHARACTERS TO
WR
I
TE
(
ALl
= CHAR TO
WR
I
TE
(BL)
=
ATTR
I
BUTE
OF CHARACTER
(ALPHA)
/ COLOR OF CHAR
(GRAPH
I
CS
I
SEE NOTE
ON
WR
I
TE
OOT FOR
BIT
7 OF
BL
=
I.
(AH)
=
OAH
WRITE
CHARACTER ONLY AT CURRENT CURSOR
POSITION
(BHI
=
DISPLAY
PAGE
(VALID
FOR
ALPHA
MODES ONLY I
(CX)
= COUNT OF CHARACTERS TO
WR
I
TE
(ALI
= CHAR TO
WRITE
NOTE:
USE
FUNCTION
(AHI=
09H
IN
GRAPHICS
MODES
FOR
READ/WRITE
CHARACTER
INTERFACE
WHILE
IN
GRAPHICS
MODE,
THE
CHARACTERS ARE FORMED FROM A CHARACTER GENERATOR
IMAGE
MAINTAINED
IN
THE
SYSTEM ROM. ONLY
THE
1ST
128
CHARS
ARE CONTA I NED
THERE.
TO READ /
WR
I
TE
THE
SECOND
128
CHARS,
THE
USER MUST
INITIALIZE
THE
POINTER
AT
INTERRUPT
IFH
(LOCATION
0007CHI
TO
POINT
TO
THE
lK
BYTE
TABLE
CONTAINING
THE
CODE PO I
NTS
FOR
THE
SECONO
128
CHARS
(128-255).
FOR
WR
I
TE
CHARACTER I
NTERFACE
I N GRAPH I CS MODE,
THE
REPL
I
CAT
I
ON
FACTOR
CONTAINED
IN
(CXI
ON
ENTRY
WILL
PRODUCE
VALID
RESULTS
ONLY
FOR CHARACTERS
CONTAINED
ON
THE
SAME ROW.
CONTINUATION
TO
SUCCEED I
NG
LINES
WILL
NOT PRODUCE
CORRECTLY.
GRAPH I CS I
NTERF
ACE
(AH)
=
OBH
SET
COLOR
PALETTE
(BH)
=
PALETTE
COLOR
10
BEING
SET
(0-1271
(
BL
) = COLOR
VALUE
TO
BE
USED
WITH
THAT
COLOR
10
NOTE:
FOR
THE
CURRENT COLOR
CARD,
TH I S
ENTRY
PO I
NT
HAS
MEANING
ONLY FOR
320X200
GRAPHICS.
COLOR
10
= 0
SELECTS
THE
BACKGROUND COLOR
(0-15
I
COLOR
10
= 1
SELECTS
THE
PALETTE
TO
BE
USED:
o = GREEN ( 1 I
/RED(2)
/YELLOW(31
I =
CYAN(
I)
/MAGENTA(21
/WHITE(3)
IN
40X25
OR
80X25
ALPHA
MODES,
THE
VALUE
SET
FOR
PALETTE
COLOR 0
INDICATES
THE
BORDER COLOR
TO
BE
USED
(VALUES
0-31,
WHERE
16-31
SELECT
THE
HIGH
I NTENS I
TY
BACKGROUND
SET.
Ml
MIL
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
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136
137
138
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141
142
143
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145
146
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148
149
150
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152
153
154
155
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163
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166
167
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185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
0000
005F
R
208
0002
0146
R
209
0004
0167
R
210
0006
018F
R
211
0008 0785
R
212
OOOA
01A6
R
213
OOOC
020F
R
214
OOOE
02AD
R
215
0010
02FF
R
216
0012
035C
R
217
0014
038E
R
218
0016
01C8
R
219
0018
0450
R
220
001
A
043F
R
221
001
C
06FE
R
222
00
1E 0 1
EE
R
223
0020
0130
R
224
0022
0130
R
225
0024
0130
R
226
0026
03BB
R
227
=
0028
228
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