IBM AT 5170 Technical Reference page 315

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IBM Personal Compute,. MACRO Assembler Ver5ion 2.00 1-1
VIDEOI --- Olb/lO/as YIDEO DISPLAY BIOS O&-IO-aS
PAGE IIa,I21
TITLE YIDEOI ---
Olb/l0/a5
VIDEO DISPLAY BIOS
.28&C
4 .LIST
0000 CODE SEGMENT BYTE PUBL I C
6
7 PUBLIC ACT DISP PAGE
8
PUBL I C READ AC CURRENT
9
PUBL I C READ-CURSOR
PUBL I C READ-DOT
11
PUBL I C READ-LPEN
12
PUBL I C SCROLL DOWN
13
PUBL I C SCROLL-UP
PUBL
I
C SET COLOR
"
PUBL I C SET-CPOS
16 PUBL I C SET-CTYPE
17 PUBL I C SET-MODE
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PUBL I C WR I1'E AC CURRENT
19
PUBL I C WR I TE-C CURRENT
PUBL I C WR I TE-DOT
21 PUBL I C WR I TE-TTY
22 PUBLIC YIDEO-IO 1
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PUBL I C Y I DEO:STATE
2.
EXTRN BEEP:NEAR SPEEKER BEEP ROUT I NE
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EXTRN CRT CHAR GEN
I
NEAR
CHARACTER GENERATOR GRAPHICS TABLE
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EXTRN DDS:NEAR- LOAD (OS! WITH OATA SEGMENT SELECTOR
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EXTRN 1045 :WORD REGEN BUFFER LENGTH TABLE
29
EXTRN MIb:BYTE COLUMNS PER MODE TABLE
EXTRN M1 :BYTE MODE SET VALUE PER MODE T ABL.E
31
32
I
NT 10
H ------------------------------------------------ - - --------------­
33
VIDEO
10
34 -THESE ROUTINES PROVIDE THE CRT DISPLAY INTERFACE
THE FOLLOWING FUNCTIONS ARE PROVIDED:
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37
(AH)= OOH SET MODE (ALl CONTAINS MODE VALUE
38 (AL) OOH 40X25 BW MODE (POIER ON DEFAULT I
39
(AL) 0 I H 40X25 COLOR
'4
(AL) 02H aoX25 BW
41 (AL) 03H 80X25 COLOR
42 GRAPH I CS MODES
43
(ALI 04H 320X200 COLOR
(AL) 05H 320X200 BI MODE
'6
(ALI OlbH 640X200 BI MODE
(AL) = 01H 80X25 MONOCHROME IUSED INTERNAL TO VIDEO ONLY)
47
••• NOTES -BW MODES OPERATE SAME AS COLOR MODES, BUT COLOR
'8
BURST I S NOT ENABLED
49
-CURSOR IS NOT DISPLAYED IN GRAPHICS MODE
(AHI::: OIH SET CURSOR TYPE
51 (CH) BITS 4-0 '" START LINE FOR CURSOR
52
•• HARDWARE WILL ALWAYS CAUSE BLINK
53 •• SETTING BIT 5 OR Ib WILL CAUSE ERRATIC BLINKING
5.
OR NO CURSOR AT AL.L
(CL.I • BITS 4-0 ::: END LINE FOR CURSOR
56
I AHI::: 02H SET CURSOR POSITION
57
(DH,DLI = ROW,COLUMN (OOH,OOH) IS UPPER LEFT
58 (BHI = PAGE NUMBER (MUST BE OOH FOR GRAPHICS MODES)
59
(AHI= 03H READ CURSOR POSITION
IBH) '" PAGE NUMBER (MUST BE OOH FOR GRAPHICS MODES)
61 ON EXIT (DH,DLI • ROW,COLUMN OF CURRENT CURSOR
62 (CH,CL) ::: CURSOR MODE CURRENTLY SET
63 IAHI= 04H READ LIGHT PEN POSITION
6.
ON EXIT:
(AHI = OOH -- LIGHT PEN SWITCH NOT DOWNINOT TRIGGERED
66 (AHI ::: 01H -- VALID LIGHT PEN VALUE IN REGISTERS
67
(DH,DLI '" ROW,COLUMN OF CHARACTER LP POSITION
68
(CHI = RASTER LINE 10-199)
69 (BX) = PIXEL COLUMN (0-319,639)
(AHI= OSH SELECT ACTIVE DISPLAY PAGE (VALID ONLY FOR ALPHA MODES)
71 (ALI = NEW PAGE VALUE (0-1 FOR MODES 0&1, 0-3 FOR MODES 2&3)
72
(AH) '" 06H SCROLL ACT I VE PAGE UP
73
(ALI'" NUMBER OF LIlES, ( LINES BLANKED AT BOTTOM OF WINDOW I
74
( AL I '" 0 OH MEANS BLANK ENT I RE I I NDOI
(CH,CLI '" ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL
76 (DH,DLI = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL
77
(BH) = ATTR I BUTE TO BE USED ON BLANK L
lIE
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(AHI= 01H SCROLL ACTIVE PAGE DOWN
7.
(ALI = NUMBER OF LINES, INPUT LINES BLANKED AT TOP OF WINDOW
(AL) = OOH MEANS BLANK ENTIRE IINDOW
81
I CH, CLI '" ROW, COLUMN OF UPPER LEFT CORNER OF SCROLL
82
(DH,DLI = ROW,COLUMN OF LOIER RIGHT CORNER OF SCROLL
83
1BH) = ATTR I BUTE TO BE USED ON BLANK LINE
8'
CHARACTER HANDL I NG ROUT I NES
86
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(AHI= 08H READ ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION
88
IBH) ::: DISPLAY PAGE (YALID FOR ALPHA MODES ONLY)
89
ON EXIT;
(AL) = CHAR READ
91
(AHI = ATTRIBUTE OF CHARACTER READ (ALPHA MODES ONLY)
92
(AHI: 09H WRITE ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION
93
(BH) : DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)
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(CX) '" COUNT OF CHARACTERS TO WR ITE
(AL) '" CHAR TO WR ITE
96
(BLl = ATTRIBUTE OF CHARACTER (ALPHA) ICOLOR OF CHAR (GRAPHICS)
97
SEE NOTE ON WRITE DOT FOR BIT 7 OF BL • I.
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(AH) = OAH WR
I
TE CHARACTER ONLY AT CURRENT CURSOR POS I T
I
ON
..
IBHI
=:
DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)
(CXI
=
COUNT OF CHARACTERS TO WRITE
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{ALI", CHAR TO WRITE
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NOTE; USE FUNCTION (AH)" 09H IN GRAPHICS MODES
103 FOR READ/WRITE CHARACTER INTERFACE WHILE IN GRAPHICS MODE, THE
10.
CHARACTERS ARE FORMED FROM A CHARACTER GENERATOR IMAGE
MAINTAINED IN THE SYSTEM ROM. ONLY THE 1ST 128 CHARS
106
ARE CONTAINED THERE. TO READIWRITE THE SECOND 128 CHARS.
107
THE USER MUST INITIALIZE THE POINTER AT INTERRUPT IFH
108 (LOCATION 000lCH) TO POINT TO THE lK BYTE TABLE CONTAINING
109
THE CODE POINTS FOR THE SECOND 128 CHARS (128-255).
FOR WRITE CHARACTER INTERFACE IN GRAPHICS MODE, THE REPLICATION FACTOR
111 CONTAINED IN (CX) ON ENTRY WILL PRODUCE VALID RESULTS ONLY
,,.
FOR CHARACTERS CONTAINED ON THE SAME ROI. CONTINUATION TO
113
SUCCEEDING LINES WILL NOT PRODUCE CORRECTLY.
114
VIDEO1 5-143