Specifications

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

Notes:

[1] interlaced only

[2] 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) 132x25 character mode.

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

resident

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

[4] 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

[5] ATI BIOS v4-1.00 has a text-scrolling bug in this mode

[6] for AT&T VDC overlay modes, BL contains the DEB mode, which may be 06h,

40h, or 44h

[7] 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.

[8] The Oak OTI-037/067/077 modes are present in the Oak VGA BIOS, which OEMs

may choose to use only partially or not at all; thus, not all Oak boards

support all "Oak" modes listed here

[9] this card uses the full 128K A000h-BFFFh range for the video buffer,

precluding the use of a monochrome adapter in the same system

[10] mode 17h supported by Tseng ET4000 BIOS 8.01X dated 1990/09/14, but not

v8.01X dated 1992/02/28; mode 21h supported by 1992/02/28 version but not

1990/09/14 version

[11] HERKULES simulates a 90x45 text mode in Hercules graphics mode; the

installation check for HERKULES.COM is the signature "Herkules" two

bytes beyond the INT 10 handler

[12] The Realtek RTVGA BIOS v3.C10 crashes when attempting to switch into

modes 21h or 27h; this version of the BIOS also sets the BIOS data area

incorrectly for extended text modes, resulting in scrolling after only

24 lines (the VMODE.EXE utility does set the data area correctly)

[13] The Tandy 1000SL/TL BIOS does not actually support this mode

[14] HERCULES.COM is a graphics-mode BIOS extension for Hercules-compatible

graphics cards by Soft Warehouse, Inc. Its installation check is to

test whether the word preceding the INT 10 handler is 4137h.

[15] The Hercules-graphics video modes for HERCBIOS (shareware by Dave

Tutelman) may be changed by a command-line switch; the 90x43

character-cell mode's number is always one higher than the 90x29 mode

(whose default is mode 08h)

[16] Stealth64 Video 2001-series BIOS v1.03 reports 76 lines for mode 7Ch,

-45-

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