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- {
- Author : GREGORY P. SMITH
-
- > Is there any way to detect OS/2 (in a Dos box) sessions and Windows
- > Sessions? I'd like to throw in support For these multitaskers so I can
- > run an idlekey Program.
-
- Actual code is always the best example For me.. Look at this Unit (and use
- it, I think you'll like it). Check With someone else if you want to
- specifically detect winslows. This Unit will, however, give up time to any
- multitasker.
- }
-
- (* Public Domain Unit by Gregory P. Smith, No Rights Reserved *)
- (* ... This also means no guarantees ... *)
-
- Unit OS_Test; { DESQview, OS/2, & 386 v86 machine Interfaces }
-
- {$X+,S-,R-,F-,O-,D-,G-} { extended syntax, nothing else }
-
- Interface
-
- Const
- In_DV : Boolean = False; { are we in DESQview? }
- In_VM : Boolean = False; { are we in a 386+ virtual machine? }
- In_OS2 : Boolean = False; { are we in OS/2? }
-
- Function OS2_GetVersion: Word; { Get OS/2 version # }
- Function DV_GetVersion: Word; { update In_DV and get version # }
- Function DV_Get_Video_Buffer(vseg:Word): Word; { get the alt video buffer }
- Procedure DV_Pause; { give up time slice }
- Procedure MT_Pause; Inline($cd/$28); { give up time in most multitaskers }
- Procedure KillTime; { Release time in any situation }
- Procedure DV_begin_Critical; { don't slice away }
- Inline($b8/$1b/$10/$cd/$15);
- Procedure DV_end_Critical; { allow slicing again }
- Inline($b8/$1c/$10/$cd/$15);
- Procedure DV_Sound(freq,dur:Integer); { Create a Sound in the Bkg }
-
- Implementation
-
- Function OS2_GetVersion: Word; Assembler;
- Asm
- MOV AH, 30h { Dos Get Version Call }
- INT 21h { AL = major version * 10, AH = minor version }
- MOV BH, AH { save minor version }
- xor AH, AH
- MOV CL, 10
- div CL { divide by 10 to get the major version }
- MOV AH, BH { restore minor version }
- XCHG AH, AL { AH = major, AL = minor }
- end;
-
- Function DV_GetVersion: Word; Assembler;
- Asm
- MOV CX,'DE' { CX+DX to 'DESQ' (invalid date) }
- MOV DX,'SQ'
- MOV AX,02B01H { Dos' set date funct. }
- INT 21H { call Dos }
- CMP AL,0FFH { Was it invalid? }
- JE @No_dv { yep, no dv }
- MOV AX,BX { AH=major AL=minor }
- MOV In_DV,1 { Set In_DV flag }
- JMP @DvGv_x { other routines }
- @No_dv:
- xor AX,AX { Return 0 or no DV }
- @DvGv_x:
- end; { DV_GetVersion }
-
- Function DV_Get_Video_Buffer(vseg:Word): Word; Assembler;
- Asm { Modified by Scott Samet April 1992 }
- CALL DV_GetVersion { Returns AX=0 if not in DV }
- MOV ES,vseg { Put current segment into ES }
- TEST AX,AX { In DV? }
- JZ @DVGVB_X { Jump if not }
- MOV AH,0FEH { DV's get video buffer Function }
- INT 10H { Returns ES:DI of alt buffer }
- @DVGVB_X:
- MOV AX,ES { Return video buffer }
- end; { DV_Get_Video_Buffer }
-
- Procedure DV_Pause;
- begin
- if In_DV then
- Asm
- MOV AX, 1000h { pause Function }
- INT 15h
- end;
- end; { DV_Pause }
-
- Procedure KillTime;
- begin
- if In_VM then
- Asm
- MOV AX, 1680h { give up VM time slice }
- INT 2Fh
- end
- else
- if In_DV then
- Asm
- MOV AX, 1000h { DV pause call }
- INT 15h
- end
- else
- MT_Pause; { Dos Idle call }
- end;
-
- (* Procedure DV_begin_Critical; Assembler;
- Asm
- MOV AX,$101B { DV begin critical Function }
- INT 15h
- end; { DV_begin_Critical }
-
- Procedure DV_end_Critical; Assembler;
- Asm
- MOV AX,$101C { DV end critical Function }
- INT 15h
- end; { DV_end_Critical } *)
-
- Procedure DV_Sound(freq,dur:Integer); Assembler; { Sound a tone }
- Asm
- MOV AX,1019H
- MOV BX,freq { frequency above 20 Hz }
- MOV CX,dur { duration in clock ticks }
- INT 15H
- end;
-
- { ** -- initalization -- ** }
-
- begin
- DV_GetVersion; { discard answer. Just update In_DV }
- Asm
- MOV AX, 1680h
- INT 2Fh { Gives up time slice in most 386+ virtual machines }
- not AL { AL = 00h if supported, remains 80h if not }
- MOV CL, 7
- SHR AL, CL { move bit 7 to bit 0 For a Boolean }
- MOV In_VM, AL { update the flag }
- end;
- In_OS2 := (OS2_GetVersion >= $0100); { version 1.0 or greater }
- end.
-