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back2root:ibm-pc-ms-dos:interrupts:int_10:int_10_00

Table des matières

INT 0x10 - 0x00 - Set video mode

Request/Call:

reg value descr
AH 0x00
AL mode Video Mode (see below)

Return:

Nothing

Parameters information

text /
grph 		text
resolution 		char
box 		pixel
resolution 		colors display
pages 		screen
addr 		system
00h T 40×25 8×8 16gray 8 B800 CGA,PCjr
T 40×25 8×14 16gray 8 B800 EGA
T 40×25 8×16 16 8 B800 MCGA
T 40×25 9×16 16 8 B800 VGA
01h T 40×25 8×8 16 8 B800 CGA,PCjr
T 40×25 8×14 16 8 B800 EGA
T 40×25 8×16 16 8 B800 MCGA
T 40×25 9×16 16 8 B800 VGA
02h T 80×25 8×8 16gray 4 B800 CGA,PCjr
T 80×25 8×14 16gray 4/8 B800 EGA
T 80×25 8×16 16 4/8 B800 MCGA
T 80×25 9×16 16 4/8 B800 VGA
03h T 80×25 8×8 16 4 B800 CGA,PCjr
T 80×25 8×14 16 4/8 B800 EGA
T 80×25 8×16 16 4/8 B800 MCGA
T 80×25 9×16 16 4/8 B800 VGA
04h G 40×25 8×8 320×200 4 B800 CGA,PCjr,EGA,MCGA,VGA
05h G 40×25 8×8 320×200 4gray B800 CGA,PCjr,EGA
G 40×25 8×8 320×200 4 B800 MCGA,VGA
06h G 80×25 8×8 640×200 2 B800 CGA,PCjr,EGA,MCGA,VGA
07h T 80×25 9×14 mono no page B000 MDA,Hercules
T 80×25 9×16 mono 8 B000 EGA, VGA
08h G 20×25 8×8 160×200 16 PCjr, Tandy 1000
T 132×25 8×8 16 B800 ATI EGA/VGA Wonder (1)
T 132×25 8×8 mono B000 ATI EGA/VGA Wonder (1)
G 90×43 8×8 720×352 mono B000 Hercules + MSHERC.COM
09h G 40×25 8×8 320×200 16 PCjr
0Ah G 80×25 8×8 640×200 4 PCjr, Tandy 1000
0Bh reserved (used internally by EGA BIOS)
G 640×200 16 Tandy 1000 SL/TL
0Ch reserved (used internally by EGA BIOS)
0Dh G 40×25 8×8 320×200 16 8 A000 EGA,VGA
0Eh G 80×25 8×8 640×200 16 4 A000 EGA,VGA
0Fh G 80×25 8×14 640×350 mono 2 A000 EGA,VGA
10h G 80×25 8×14 640×350 4 2 A000 64k EGA
G 640×350 16 A000 256k EGA,VGA
11h G 80×30 8×16 640×480 mono A000 VGA,MCGA,ATI EGA,ATI VIP
12h G 80×30 8×16 640×480 16/256k A000 VGA,ATI VIP
G 80×30 8×16 640×480 16/64 A000 ATI EGA Wonder
G 640×480 16 UltraVision+256K EGA
13h G 40×25 8×8 320×200 256/256k A000 VGA,MCGA,ATI VIP
14h T 132×25 Nx16 16 XGA, IBM Enhanced VGA (2)
G 80×25 8×8 640×200 Lava Chrome II EGA
G 640×400 16 Tecmar VGA/AD
15h G 80×25 8×14 640×350 Lava Chrome II EGA
16h G 80×25 8×14 640×350 Lava Chrome II EGA
G 800×600 16 Tecmar VGA/AD
17h G 80×34 8×14 640×480 Lava Chrome II EGA
T 132×25 Tecmar VGA/AD
18h T 132×44 8×8 mono Tseng Labs EVA
T 132×44 8×8 16/256 2 B000 Tseng ET4000 chipset
G 80×34 8×14 640×480 Lava Chrome II EGA
G 1 024×768 16 Tecmar VGA/AD
19h T 132×25 8×14 mono Tseng Labs EVA
T 132×25 8×14 16/256 4 B000 Tseng ET4000 chipset
1Ah T 132×28 8×13 mono Tseng Labs EVA
T 132×28 8×13 16/256 4 B000 Tseng ET4000 chipset
G 640×350 256 Tecmar VGA/AD
1Bh G 640×400 256 Tecmar VGA/AD
1Ch G 640×480 256 Tecmar VGA/AD
1Dh G 800×600 256 Tecmar VGA/AD
20h G 240×128 B000 HP 95LX
21h T 132×60 16 2 B800 Tseng ET4000 chipset
G 80×43 8×8 720×348 mono B000 DESQview 2.x+Hercules (3)
22h T 132×44 8×8 Tseng Labs EVA
T 132×44 8×8 16/256 2 B800 Tseng ET4000 chipset
T 132×44 8×8 Ahead Systems EGA2001
T 132×44 8×8 16 2 B800 Ahead B
T 132×44 16 Orchid Prodesigner VGA
T 132×43 Allstar Peacock (VGA)
G 80×43 8×8 720×348 mono B800 DESQview 2.x+Hercules (3)
23h T 132×25 6×14 Tseng Labs EVA
T 132×25 8×14 16/256 4 B800 Tseng ET4000 chipset
T 132×25 8×14 Ahead Systems EGA2001
T 132×25 8×14 16 4 B800 Ahead B
T 132×25 8×8 16 B800 ATI EGA Wonder,ATI VIP
T 132×28 Allstar Peacock (VGA)
T 132×28 16 Orchid Prodesigner VGA
24h T 132×28 6×13 Tseng Labs EVA
T 132×28 8×13 16/256 4 B800 Tseng ET4000 chipset
T 132×28 8×12 16 1 B800 Ahead B
T 132×25 Allstar Peacock (VGA)
T 132×25 16 Orchid Prodesigner VGA
25h G 80×60 8×8 640×480 Tseng Labs EVA
G 80×60 8×8 640×480 16/256 1 A000 Tseng ET4000 chipset
G 640×480 16 VEGA VGA
G 80×60 8×8 640×480 16 A000 Orchid Prodesigner VGA
G 80×60 8×8 640×480 16 1 A000 Ahead B (same as 26h)
G 640×480 16 NEC GB-1
26h T 80×60 8×8 Tseng Labs EVA
T 80×60 8×8 16/256 2 B800 Tseng ET4000 chipset
T 80×60 Allstar Peacock (VGA)
T 80×60 16 Orchid ProDesigner VGA
G 80×60 8×8 640×480 Ahead Systems EGA2001
G 80×60 8×8 640×480 16 1 A000 Ahead B (same as 25h)
27h T 132×25 8×8 mono B000 ATI EGA Wonder,ATI VIP
G 720×512 16 VEGA VGA
G 720×512 16 Genoa
28h T ???x??? VEGA VGA
29h G 800×600 16 VEGA VGA
G 100×37 8×16 800×600 16 A000 Orchid
G 800×600 16 A000 STB,Genoa,Sigma
G 800×600 16 Allstar Peacock (VGA)
G 100×37 8×16 800×600 16/256 1 A000 Tseng ET3000/4000 chipset
G 800×600 ??? EIZO MDB10
2Ah T 100×40 Allstar Peacock (VGA)
T 100×40 8×16 16 Orchid Prodesigner VGA
T 100×40 8×15 16/256 4 B800 Tseng ET4000 chipset
2Dh G 640×350 256 VEGA VGA
G 640×350 256/256k A000 Orchid, Genoa, STB
G 80×25 8×14 640×350 256/256k 1 A000 Tseng ET3000/4000 chipset
2Eh G 640×480 256 VEGA VGA
G 80×30 8×16 640×480 256/256k A000 Orchid
G 640×480 256/256k A000 STB,Genoa,Sigma
G 80×30 8×16 640×480 256/256k 1 A000 Tseng ET3000/4000 chipset
2Fh T 160×50 8×8 1 280×400 16 4 B800 Ahead B (Wizard/3270)
G 720×512 256 VEGA VGA
G 720×512 256 Genoa
G 80×25 8×16 640×400 256/256k 1 A000 Tseng ET4000 chipset
30h G 800×600 256 VEGA VGA
G 100×37 8×16 800×600 256/256k A000 Orchid
G 800×600 256/256k A000 STB,Genoa,Sigma
G 720×350 2 3270 PC
G 800×600 256 Cardinal
G ???x??? B800 AT&T 6300
G 100×37 8×16 800×600 256/256k 1 A000 Tseng ET3000/4000 chipset
32h T 80×34 8×10 16 4 B800 Ahead B (Wizard/3270)
33h T 132×44 8×8 16 B800 ATI EGA Wonder,ATI VIP
T 80×34 8×8 16 4 B800 Ahead B (Wizard/3270)
34h T 80×66 8×8 16 4 B800 Ahead B (Wizard/3270)
36h G 960×720 16 VEGA VGA
G 960×720 16 STB
G 960×720 16 Tseng ET3000 only
37h G 1 024×768 16 VEGA VGA
G 128×48 8×16 1 024×768 16 A000 Orchid
G 1 024×768 16 A000 STB,Genoa,Sigma
G 1 024×768 16 Definicon
G 128×48 8×16 1 024×768 16 1 A000 Tseng ET3000/4000
T 132×44 8×8 mono B800 ATI EGA Wonder,ATI VIP
38h G 1 024×768 256 STB VGA/EM-16 Plus (1MB)
G 128×48 8×16 1 024×768 256/256k 1 A000 Tseng ET4000 chipset
G 1 024×768 256 Orchid ProDesigner II
3Dh G 1 280×1024 16 Definicon
G 128×64 8×16 1 280×1024 16 1 A000 Tseng ET4000 BIOS v3.00 (6)
3Eh G 1 280×961 16 Definicon
40h G 80×25 8×16 640×400 2 1 B800 AT&T 6300, AT&T VDC600
G 80×25 8×16 640×400 2 1 B800 Compaq Portable
T 80×43 VEGA VGA, Tecmar VGA/AD
T 80×43 Video7 V-RAM VGA
T 80×43 Tatung VGA
T 100×30 16 MORSE VGA
41h G 640×200 16 1 AT&T 6300
T 132×25 VEGA VGA
T 132×25 Tatung VGA
T 132×25 Video7 V-RAM VGA
T 100×50 16 MORSE VGA
42h G 80×25 8×16 640×400 16 AT&T 6300, AT&T VDC600
T 132×43 VEGA VGA
T 132×43 Tatung VGA
T 132×43 Video7 V-RAM VGA
T 80×34 9×10 4 4 B800 Ahead B (Wizard/3270)
T 100×60 16 MORSE VGA
43h G 640×200 of 640×400 viewport AT&T 6300 (unsupported)
T 80×60 VEGA VGA
T 80×60 Tatung VGA
T 80×60 Video7 V-RAM VGA
T 80×45 9×8 4 4 B800 Ahead B (Wizard/3270)
T 100×75 16 MORSE VGA
44h disable VDC and DEB output AT&T 6300
T 100×60 VEGA VGA
T 100×60 Tatung VGA
T 100×60 Video7 V-RAM VGA
45h T 132×28 Tatung VGA
T 132×28 Video7 V-RAM VGA
46h G 100×40 8×15 800×600 2 AT&T VDC600
47h G 100×37 8×16 800×600 16 AT&T VDC600
48h G 80×50 8×8 640×400 2 B800 AT&T 6300, AT&T VDC600
49h G 80×30 8×16 640×480 Lava Chrome II EGA
4Dh T 120×25 VEGA VGA
4Eh T 120×43 VEGA VGA
4Fh T 132×25 VEGA VGA
T 132×60 some Oak Tech VGA
50h G 80×30 8×16 640×480 16 Paradise EGA-480
T 80×30 8×16 16/256k B800 Trident TVGA 8800/8900
T 80×34 Lava Chrome II EGA
T 80×43 mono VEGA VGA
G 640×480 mono??? Taxan 565 EGA
T 132×25 9×14 mono Ahead Systems EGA2001
T 132×25 9×14 4 4 B800 Ahead B
T 132×25 8×14 16 8 B800 OAK Technologies VGA-16
T 132×30 16 MORSE VGA
51h T 80×30 8×16 Paradise EGA-480
T 80×30 Lava Chrome II EGA
G 80×34 8×14 640×480 16 ATI EGA Wonder
T 80×43 8×11 16/256k B800 Trident TVGA 8800/8900
T 132×25 mono VEGA VGA
T 132×43 8×8 16 5 B800 OAK Technologies VGA-16
T 132×28 9×12 4 4 B800 Ahead B
T 132×50 16 MORSE VGA
52h T 80×60 Lava Chrome II EGA
T 80×60 8×8 16/256k B800 Trident TVGA 8800/8900
G 94×29 8×14 752×410 16 ATI EGA Wonder
G 100×75 8×8 800×600 16 1 A000 OAK Technologies VGA-16
T 132×43 mono VEGA VGA
T 132×44 9×8 mono Ahead Systems EGA2001
T 132×44 9×8 4 2 B800 Ahead B
T 132×60 16 MORSE VGA
53h G 100×40 8×14 800×560 16 ATI EGA Wonder,ATI VIP
G 640×480 256 Oak VGA
T 132×25 8×14 16/256k B800 Trident TVGA 8800/8900
T 132×43 Lava Chrome II EGA
T 80×60 16 MORSE VGA
G AX PC
54h G 100×42 8×14 800×600 16 A000 ATI EGA Wonder, VGA Wonder
G 800×600 256 Oak VGA
T 132×25 Lava Chrome II EGA
T 132×30 8×16 16/256k B800 Trident TVGA 8800/8900
T 132×43 8×8 Paradise EGA-480
T 132×43 7×9 16/256k B800 Paradise VGA
T 132×43 8×9 16/256k B800 Paradise VGA on multisync
T 132×43 Taxan 565 EGA
T 132×43 AST VGA Plus
T 132×43 Hewlett-Packard D1180A
T 132×43 7×9 16 AT&T VDC600
55h T 80×66 8×8 16/256k A000 ATI VIP
T 132×25 8×14 Paradise EGA-480
T 132×25 7×16 16/256k B800 Paradise VGA
T 132×25 8×16 16/256k B800 Paradise VGA on multisync
T 132×25 Taxan 565 EGA
T 132×25 AST VGA Plus
T 132×25 Hewlett-Packard D1180A
T 132×25 7×16 16 AT&T VDC600
T 132×43 8×11 16/256k B800 Trident TVGA 8800/8900
G 94×29 8×14 752×410 Lava Chrome II EGA
G 128×48 8×16 1 024×768 16/256k A000 ATI VGA Wonder v4+ (4)
G 1 024×768 16/256h ATI VGA Wonder Plus
56h T 132×43 8×8 3??? 2 B000 NSI Smart EGA+
T 132×43 7×9 4 B000 Paradise VGA
T 132×43 8×9 4 B000 Paradise VGA on multisync
T 132×43 mono Taxan 565 EGA
T 132×43 7×9 2 AT&T VDC600
T 132×60 8×8 16/256k B800 Trident TVGA 8800/8900
G 1 024×768 16 Oak VGA
57h T 132×25 8×14 3??? 4 B000 NSI Smart EGA+
T 132×25 7×16 4 B000 Paradise VGA
T 132×25 8×16 4 B000 Paradise VGA on multisync
T 132×25 mono Taxan 565 EGA
T 132×25 7×16 2 AT&T VDC600
T 132×25 9×14 16/256k B800 Trident TVGA 8800/8900
58h G 100×75 8×8 800×600 16/256k A000 Paradise VGA
G 100×75 8×8 800×600 16 AT&T VDC600
T 80×33 8×14 16 B800 ATI EGA Wonder,ATI VIP
G 800×600 16 AST VGA Plus, Compaq VGA
G 800×600 16 Dell VGA
G 800×600 16 Hewlett-Packard D1180A
G 800×600 ??? ELT VGA PLUS 16
T 132×30 9×16 16/256k B800 Trident TVGA 8800/8900
59h G 100×75 8×8 800×600 2 A000 Paradise VGA
G 100×75 8×8 800×600 2 AT&T VDC600
T 80×66 8×8 16/256k A000 ATI VIP
G 800×600 2 AST VGA Plus, Compaq VGA
G 800×600 2 Dell VGA
G 800×600 2 Hewlett-Packard D1180A
T 132×43 9×11 16/256k B800 Trident TVGA 8800/8900
5Ah T 132×60 9×8 16/256k B800 Trident TVGA 8800/8900
5Bh G 800×600 16 Maxxon, SEFCO TVGA, Imtec
G 640×350 256 Genoa 6400
T 80×30 8×16 B800 ATI VGA Wonder (undoc)
G 100×75 8×8 800×600 16/256k A000 Trident TVGA 8800, 8900
G 800×600 ??? Vobis MVGA
5Ch G 640×400 256 Logix, ATI Prism Elite
G 640×400 256 Maxxon, SEFCO TVGA, Imtec
G 80×25 8×16 640×400 256/256 k A000 Zymos Poach, Hi Res 512
G 80×25 8×16 640×400 256/256 k A000 Trident TVGA 8800/8900
G 640×480 256 Genoa 6400
5Dh G 640×480 256 Logix, ATI Prism Elite
G 640×480 256 Maxxon, SEFCO TVGA, Imtec
G 80×30 8×16 640×480 256/256 k A000 Zymos Poach, Hi Res 512
G 80×30 8×16 640×480 256/256 k A000 Trident TVGA 8800 (512K)
5Eh G 640×400 256 Paradise VGA,VEGA VGA
G 640×400 256 AST VGA Plus
G 640×400 256 Compaq VGA, Dell VGA
G 80×25 8×16 640×400 256 AT&T VDC600
G 800×600 16 Logix, ATI Prism Elite
G 800×600 256 Genoa 6400
G 100×75 8×8 800×600 256/256 k A000 Zymos Poach, Trident 8900
G 100×75 8×8 800×600 256/256 k A000 Hi Res 512
5Fh G 640×480 256 Paradise VGA
G 640×480 256 AST VGA Plus
G 640×480 256 Compaq VGA, Dell VGA
G 640×480 256 Hewlett-Packard D1180A
G 80×30 8×16 640×480 256 AT&T VDC600 (512K)
G 1 024×768 16 Logix, ATI Prism Elite
G 1 024×768 16 Maxxon, Genoa 6400, Imtec
G 128×48 8×16 1 024×768 16/256 k A000 Zymos Poach, Hi Res 512
G 128×48 8×16 1 024×768 16/256 k A000 Trident TVGA 88/8900 512K
60h G 80x??? ???x400 Corona/Cordata BIOS 4.10+
G 752×410 VEGA VGA
G 752×410 16 Tatung VGA
G 752×410 16 Video7 V-RAM VGA
G 80×25 8×16 640×400 256 1 A000 Ahead A, Ahead B
G 128×48 8×16 1 024×768 4/256 k A000 Trident TVGA 8900
T 132×25 8×14 16/64 8 B800 Quadram Ultra VGA
61h G ???x400 Corona/Cordata BIOS 4.10+
G 720×540 VEGA VGA
G 720×540 16 Tatung VGA
G 720×540 16 Video7 V-RAM VGA
G 80×25 8×16 640×400 256 A000 ATI VGA Wonder,VGA Wonder+
G 80×30 8×16 640×480 256 1 A000 Ahead A, Ahead B (512K)
G 96×64 8×16 768×1024 16/256 k A000 Trident TVGA 88/8900 512K
T 132×29 8×12 16/64 8 B800 Quadram Ultra VGA
62h G 800×600 VEGA VGA
G 800×600 16 Tatung VGA
G 800×600 16 Video7 V-RAM VGA
G 80×30 8×16 640×480 256 A000 ATI VGA Wonder,VGA Wonder+
G 100×75 8×8 800×600 256 1 A000 Ahead A, Ahead B (512K)
G 128×48 8×16 1 024×768 256/256 k A000 Trident TVGA 8900, Zymos
T 132×32 8×11 16/64 6 B800 Quadram Ultra VGA
63h G 1 024×768 2 Video7 V-RAM VGA
G 100×42 8×14 800×600 256 A000 ATI VGA Wonder,VGA Wonder+
G 128×48 7×16 1 024×768 256 1 A000 Ahead B (1MB)
T 132×44 8×8 16/64 5 B800 Quadram Ultra VGA
G 720×540 16 MORSE VGA
64h G 1 024×768 4 Video7 V-RAM VGA
G 128×48 8×16 1 024×768 256 A000 ATI VGA Wonder Plus
G 800×600 16 MORSE VGA
G 800×600 ??? SAMPO-Mira VGA
65h G 1 024×768 16 Video7 V-RAM VGA
G 128×48 8×16 1 024×768 16 A000 ATI VGA Wonder
66h G 640×400 256 Tatung VGA
G 640×400 256 Video7 V-RAM VGA
67h G 640×480 256 Video7 V-RAM VGA
G 128×48 8×16 1 024×768 4 A000 ATI VGA Wonder
69h G 720×540 256 Video7 V-RAM VGA
6Ah G 800×600 16 A000 VESA standard interface
G 800×600 16 Genoa 6400
G 800×600 16 A000 Ahead A
G 100×75 8×8 800×600 16 1 A000 Ahead B (VESA) (see 71h)
G 800×600 16 Zymos Poach, Hi Res 512
G 800×600 16 Epson LT-386SX in CRT Mode
G 800×600 16 Compuadd 316SL in CRT Mode
G 100×42 8×14 800×600 A000 ATI VGA Wonder (undoc)
70h G 800×600 16 C&T chipset, Cardinal
G 90×28 8×14 720×392 16 1 A000 Ahead B
T 40×25 8×8 16 8 B800 Quadram (CGA double scan)
extended mode set (see AX=0070h) Everex Micro Enhancer EGA
71h G 100×35 8×16 800×600 16of64 A000 NSI Smart EGA+
G 960×720 16 C&T chipset, Cardinal
G 100×75 8×8 800×600 16 1 A000 Ahead B (same as 6Ah)
T 80×25 8×8 16 8 B800 Quadram (CGA double scan)
72h G 1 024×768 16 C&T chipset, Cardinal
T 80×60 8×8 16 B800 Quadram Ultra VGA
G 640×480 32768 A000 ATI
73h G 80×60 8×8 640×480 16??? A000 Quadram Ultra VGA
74h G 640×400 2 B800 Toshiba 3100 AT&T mode
G 128×48 8×16 1 024×768 16 1 A000 Ahead A, Ahead B (512K)
T 80×66 8×8 16 B800 Quadram Ultra VGA
75h G 128×48 8×16 1 024×768 4 1 A000 Ahead B
G 80×66 640×528 16??? A000 Quadram Ultra VGA
G 640×528 16 Geno Super EGA Hirez+
76h G 128×48 8×16 1 024×768 2 1 A000 Ahead B
T 94×29 8×14 16 B800 Quadram Ultra VGA
77h G 94×29 752×410 16??? A000 Quadram Ultra VGA
G 752×410 16 Genoa Super EGA Hirez+
78h G 640×400 256 STB VGA/EM-16 Plus
G 640×400 256 Cardinal, C&T chipset
T 100×75 8×8 16 B800 Quadram Ultra VGA
79h G 640×480 256 Cardinal, C&T chipset
G 100×75 800×600 16??? A000 Quadram Ultra VGA
G 800×600 16 Genoa Super EGA Hirez+
7Ah G 720×540 256 C&T chipset, Cardinal
T 114×60 8×8 16 B800 Quadram Ultra VGA
7Bh G 800×600 256 C&T chipset, Cardinal
G 114×60 912×480 16??? A000 Quadram Ultra VGA
G 912×480 16 Genoa Super EGA Hirez+
7Ch G 512×512 16 Genoa
7Dh G 512×512 256 Genoa
7Eh special mode set (see AX=007Eh) Paradise VGA, AT&T VDC600
7Fh special function set (see AX=007Fh) Paradise VGA, AT&T VDC600
82h T 80×25 B&W AT&T VDC overlay mode (5)
83h T 80×25 AT&T VDC overlay mode (5)
86h G 640×200 B&W AT&T VDC overlay mode (5)
88h G 90×43 8×8 720×352 mono B000 Hercules + MSHERC.COM
8xh EGA, MCGA or VGA ignore bit 7, see below
9xh EGA, MCGA or VGA ignore bit 7, see below
C0h G 640×400 2/prog pallet AT&T VDC overlay mode (5)
C4h disable output AT&T VDC overlay mode (5)
D0h G 640×400 2 B800 DEC VAXmate AT&T mode
  • if AL bit 7=1, prevents EGA,MCGA & VGA from clearing display
  • function updates byte at 40:49; bit 7 of byte 40:87 (EGA/VGA Display Data Area) is set to the value of AL bit 7

(1) ATI

for ATI EGA Wonder, mode 08h is only valid if SMS.COM is loaded resident.

SMS maps mode 08h to mode 27h if the byte at location 0040:0063 is 0B4h, otherwise to mode 23h, thus selecting the appropriate (monochrome or color) 132×25 character mode.

for ATI VGA Wonder, mode 08h is the same, and only valid if VCONFIG loaded resident

(2) XGA

early XGA boards support 132-column text but do not have this BIOS mode

(3) DESQview

DESQview intercepts calls to change into these two modes (21h is page 0, 22h is page 1) even if there is no Hercules graphics board installed

[4] ATI BIOS

ATI Bios v4-1.00 has a text-scrolling bug in this mode

(5) AT&T & VDC overlay

for AT&T VDC overlay modes, BL contains the DEB mode, which may be 06h, 40h, or 44h

(6)Tseng

BIOS text support is broken in this undocumented mode; scrolling moves only about 1/3 of the screen (and does even that portion incorrectly), while screen clears only clear about 3/4.

2023/01/10 15:53 · frater

Detecting Graphics Card

Ahead Adapter

the installation check for Ahead adapters is the signature “AHEAD” at C000h:0025h

ATI

the installation check for ATI adapters is the signature “761295520” at C000h:0031h;

the byte at C000h:0043h indicates the chipset revision:

  • 31h for 18800
  • 32h for 18800-1
  • 33h for 18800-2
  • 34h for 18800-4
  • 35h for 18800-5

the two bytes at C000h:0040h indicate the adapter type

  • “31” VGA Wonder
  • “32” EGA Wonder800+

Card accessories

the byte at C000h:0042h contains feature flags

  • bit 1: mouse port present
  • bit 4: programmable video clock

additionnal features

the byte at C000h:0044h contains additional feature flags if chipset byte > 30h

  • bit 0: 70 Hz non-interlaced display
  • bit 1: Korean (double-byte) characters
  • bit 2: 45 MHz memory clock rather than 40 MHz
  • bit 3: zero wait states
  • bit 4: paged ROMs
  • bit 6: no 8514/A monitor support
  • bit 7: HiColor DAC

Genoa Adapter

the installation check for Genoa video adapters is the signature 77h XXh 99h 66h at C000h:0037h, where XXh is

  • 00h for Genoa 6200/6300
  • 11h for Genoa 6400/6600
  • 22h for Genoa 6100
  • 33h for Genoa 5100/5200
  • 55h for Genoa 5300/5400

Paradise adapter

the installation check for Paradise adapters is the signature “VGA=” at C000h:007Dh

Notes

IBM standard modes do not clear the screen if the high bit of AL is set (EGA or higher only) (see mode 0x8? and 0x9? and notes)

the Tseng ET4000 chipset is used by the Orchid Prodesigner II, Diamond SpeedSTAR VGA, Groundhog Graphics Shadow VGA, Boca Super X VGA

See Also

INT 10,0070; INT 10,007E; INT 10,10F0; INT 10,6F05; INT 10,FF; INT 5F,00

INT 62,0001

Video Information Tables

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back2root/ibm-pc-ms-dos/interrupts/int_10/int_10_00.txt · Dernière modification : 2023/01/22 09:53 de frater

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