Specifications

D:\D\inter61a\INTERRUP.A Saturday, January 08, 2011 11:31 AM

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

62h for 68800AX (Mach32) (see also #00732)

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

"22" EGA Wonder

"31" VGA Wonder

"32" EGA Wonder800+

the byte at C000h:0042h contains feature flags

bit 1: mouse port present

bit 4: programmable video clock

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

byte > 30h (see #00009)

for Genoa video adapters, the signature 77h XXh 99h 66h at C000h:NNNNh,

where NNNNh is stored at C000h:0037h and 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

for SuperEGA BIOS v2.41+, C000h:0057h contains the product level

for Genoa SuperEGA BIOS v3.0+, C000h:0070h contains the signature

"EXTMODE", indicating support for extended modes

Notes: IBM standard modes do not clear the screen if the high bit of AL is set

(EGA or higher only)

the Tseng ET4000 chipset is used by the Orchid Prodesigner II, Diamond

SpeedSTAR VGA, Groundhog Graphics Shadow VGA, Boca Super X VGA,

Everex EV-673, etc.

intercepted by GRAFTABL from Novell DOS 7 and Caldera OpenDOS 7.01.

SeeAlso: AX=0070h,AX=007Eh,AX=10E0h,AX=10F0h,AH=40h,AX=6F05h,AH=FFh"GO32"

SeeAlso: INT 33/AX=0028h,INT 5F/AH=00h,INT 62/AX=0001h,MEM 0040h:0049h

Index: installation check;Tseng ET4000|installation check;Ahead video cards

Index: installation check;Oak Technologies|installation check;ATI video cards

Index: installation check;Paradise video|installation check;Genoa video cards

Bitfields for ATI additional feature flags:

Bit(s) Description (Table 00009)

0 70 Hz non-interlaced display

-26-

http://www.foxitsoftware.com For evaluation only.