Re: display.sys / turbo3 / nansi / ms- and freedos / crashing DPMI1

>
>
>EA> loading specific charsets into your video hardware. You are right, most
>
>     Yes, this utility was developed precisely for dealing with fonts,
>although Aitor states, that it also used to handle requests of changing
>codepages.
>
 From RBIL, int2Fh:

Int 2F/AX=AD00h - DOS 3.3+ DISPLAY.SYS internal - INSTALLATION CHECK
Int 2F/AX=AD00h - DR DOS 3.41-5.0, Novell DOS 7 KEYB - INSTALLATION CHECK
Int 2F/AX=AD01h - DOS 3.3+ DISPLAY.SYS internal - SET ACTIVE CODE PAGE
Int 2F/AX=AD01h - DR DOS 3.41,5.0 KEYB - GET CONFIGURATION
Int 2F/AX=AD01h - Novell DOS 7 KEYB - GET/SET??? CONFIGURATION
Int 2F/AX=AD02h - DOS 3.3+ DISPLAY.SYS internal - GET ACTIVE CODE PAGE
Int 2F/AX=AD02h - Novell DOS 7 KEYB - ???
Int 2F/AX=AD03h - DOS 3.3+ DISPLAY.SYS internal - GET CODE PAGE INFORMATION
Int 2F/AX=AD04h - DOS 4.x only DISPLAY.SYS internal - ???
Int 2F/AX=AD10h - DOS 4.x DISPLAY.SYS internal - INSTALLATION CHECK???
Int 2F/AX=AD10h - DOS 5+ DISPLAY.SYS internal - ???

These (AD00h, AD01h, AD02h) and the two temporary "backdoors"
Int 2F/AX=AD0Eh - FreeDOS DISPLAY.COM 0.06+ internal - PREPARE CODEPAGE
Int 2F/AX=AD0Fh - FreeDOS DISPLAY.COM 0.06+ internal - RETRIEVE PREPARED 
CODEPAGE INFORMATION
are what will be defined in DISPLAY 0.06. An accompaining utility 
(MODECON.EXE) will communicate with this, until I turn it into a device 
driver, and IOCTL is ready.

Generic IOCTL request:

DOS 3.2+ - IOCTL - GENERIC CHARACTER DEVICE REQUEST
AX = 440Ch
BX = device handle
CH = category code (see #01545)
CL = function number (see #01546)
DS:DX -> parameter block (see #01547,#01548,#01549,#01550,#01551,#01552)
SI = parameter to pass to driver (European MS-DOS 4.0, OS/2 comp box)
DI = parameter to pass to driver (European MS-DOS 4.0, OS/2 comp box)
Return:CF set on error
AX = error code (see #01680 at AH=59h/BX=0000h)
CF clear if successful
DS:DX -> iteration count if CL=65h
SI = returned value (European MS-DOS 4.0, OS/2 comp box)
DI = returned value (European MS-DOS 4.0, OS/2 comp box)


where

(Table 01546)
Values for generic character IOCTL function:
00h    MAC driver Bind (STARLITE) (see #01547)
40h    DOS 3??? only:Was reserved for set screen mode (see #04116)
45h    set iteration (retry) count (see #01548)
4Ah    select code page (see #01549)
4Ch    start code-page preparation (see #01550)
4Dh    end code-page preparation (see #01551)
5Fh    set display information (DOS 4.0+) (see #01552)
60h    DOS 3??? only:Was reserved for get screen mode (see #04116)
65h    get iteration (retry) count
6Ah    query selected code page (see #01549)
6Bh    query codepage prepare list (DOS 4.0+) (see #01553)
7Fh    get display information (DOS 4.0+) (see #01552)

Aitor