{$A+,B-,D+,E-,F-,G-,I+,L-,N-,O-,R-,S-,T-,V-,X+} {$M 3072,0,0} (* A program to test some interesting behaviour of Int 21h, function 44h subfunction 08h.....the MicroSoft documentation I have seen indicates only that this returns an error if the flags register is set. however, it seems that it also identifies the default bootable logical drive, whether the machine was booted from a floppy, and discriminates between Ram drives and normal HDrives.....& more! Would appreciate your assistance in running this test and returning this information to me by mail. The results will be published in the FIDO Pascal echo. **************** WARNING ***************** Although this program has run completely safely on all machines tested by me, you should shut down or save all critical processes before running this test. L.R.A. 5/6/94 *) Program TestDisk; Uses Dos; Const TapeDrive = $01; CdRom = $02; Floppy = $03; (* Old 8 inch & ALL Floppies *) Floppy360 = $04; (* Also 320K Floppy *) Floppy720 = $05; Floppy12 = $06; Floppy14 = $07; Floppy28 = $08; Floptical = $09; Bernoulli = $0a; RamDrive = $0b; HardDrive = $0c; BootHrdDrive = $0d; (* Default HARD-Disk BootDrive !!! *) DriveTypes : array[0..13] of string[12] = ('ERROR !', 'TapeDrive', 'CdRom', 'Floppy', '360K Floppy', '720K Floppy', '1.2M Floppy', '1.44M Floppy', '2.88M Floppy', 'Floptical', 'Bernoulli', 'RamDrive', 'HardDrive', 'BootHrdDrive'); Var i : byte; bits : string[16]; buff : array [0..2047] of byte; drive : char; Dtype : byte; f : text; y,m,d,dow : word; lastdrive : byte; regs : registers; version : word; (*------------------------------------------------------*) Function BinStr(num:word;bits:byte):string; assembler; ASM PUSHF LES DI, @Result XOR CH, CH MOV CL, bits MOV ES:[DI], CL JCXZ @@3 ADD DI, CX MOV BX, num STD @@1: MOV AL, BL AND AL, $01 OR AL, $30 STOSB SHR BX, 1 LOOP @@1 @@3: POPF End; (*------------------------------------------------------*) Function DosVersion : word; Begin with regs do begin ax := $3000; Intr($21,regs); DosVersion := (word(al)*100)+word(ah); end; End; (*---------------------------------------------------------*) (* Uses Undocumented function 52h to return actual logical lastdrive even under Novell and even if LastDrive is not used in Config.Sys. Must be DOS 3.1 or higher !! Return is 1 based ie: A=1, B=2, C=3, etc. !!!! Note: this will always return 5 if lastdrive is not specified in config.sys, even if less then 5 drives ! *) Function GetLastDrive(Var Drives:byte):boolean; Begin With regs do begin ah := $52; (* Return pointer to List of Lists *) es := 0; bx := 0; Intr($21,regs); (* This offset is ONLY valid for DOS 3.1 and above !! *) Drives := Mem[es:bx+$21]; GetLastDrive := (Drives <> $FF) AND ((es <> 0) AND (bx <> 0)); end; End; (*-----------------------------------------------------------*) (* Switches to requested drive and then checks for error - Be sure to call this with Drive UpCased !! - Should work OK with networks ??????? *) Function DriveValid(drive: char): boolean; assembler; asm mov ah, 19h { Select DOS sub function 19h } int 21h { Call DOS for current disk drive } mov bl, al { Save drive code in bl } mov al, Drive { Assign requested drive to al } sub al, 'A' { Adjust so A:=0, B:=1, etc. } mov dl, al { Save adjusted result in dl } mov ah, 0eh { Select DOS sub function 0eh } int 21h { Call DOS to set default drive } mov ah, 19h { Select DOS sub function 19h } int 21h { Get current drive again } mov cx, 0 { Preset result to False } cmp al, dl { Check if drives match } jne @@1 { Jump if not--drive not valid } mov cx, 1 { Preset result to True } @@1: mov dl, bl { Restore original default drive } mov ah, 0eh { Select DOS sub function 0eh } int 21h { Call DOS to set default drive } xchg ax, cx { Return function result in ax } End; (*-----------------------------------------------------*) (* Be sure to call this with drive UpCased ! *) Function IsCDRom(drive : char) : boolean; Begin with regs do begin ax := $150b; bx := $0000; cx := word(ord(drive)-65); Intr($2f,regs); (* If MSCDEX is loaded, bx will be $adad ! *) IsCDRom := (ax <> 0) AND (bx = $adad); end; End; (*-----------------------------------------------------*) (* Returns false if drive is local - untested !!! *) Function DriveIsRemote(drive : char):boolean; Begin with regs do begin ah := $44; al := $09; bl := ord(drive)-64; Intr($21,regs); DriveIsRemote := ((dx AND $1000) <> 0) AND (fCarry = 0); (* Can further check if drive is substituted with dx AND $8000 = $8000 if so *) end; End; (*------------------------------------------------------*) (* Be sure that Drive is UPCASED ! Returns FALSE on Anything that is NOT a HardDisk, including RamDisks, CdRom, etc. *) Function IsHardDisk(drive:char):boolean; Begin with regs DO begin ah := $44; al := $08; bl := ord(drive)-64; Intr($21, regs); IsHardDisk := (flags AND fCarry <> fCarry) AND (NOT (ax in [$0,$0f])); (* ax = $0 for removable, $0f on invalid drive spec ! *) end; End; (*------------------------------------------------------------------*) (* CAUTION !!!!! THIS FUNCTION IS EXPERIMENTAL !!!!!!!!! *) (* Be sure that drive is UPCASED ! - This function goes to DOS internal structures to get params for floppy type drives. (Including Bernoulli). Because it tells DOS to rebuild the BPB (Bios Parameter Block) for drives with removable media, the Media Descriptor byte will always return the boot paramaters for the drive, ie: a 1.44M floppy will always return 1.44M, regardless of the size disk that is currently actually in the drive !! A return of BootHrdDrive indicates ONLY that this is the HardDrive with the DOS boot partition on it. It DOES NOT indicate that the machine was booted from that drive !!! Dos version is MINIMUM of 3.1 !! - Check FIRST !! Because it does NOT read the drive, this puppy is FAST !! Returns these Constant types : ERROR ! = $00; TapeDrive = $01 CdRom = $02; Check against this- Floppy = $03; -to get All floppys !! Floppy360 = $04; Floppy720 = $05; Floppy12 = $06; Floppy14 = $07; Floppy28 = $08; Floptical = $09; Bernoulli = $0a; RamDrive = $0b; HardDrive = $0c; BootHrdDrive = $0d; *) Function DriveType(Var f:text;drive:char):byte; Type PtrDpbPtr = ^DpbPtr; DpbPtr = ^DPB; DPB = record (* Drive Parameter Block *) DN : byte; (* 0=A etc Can compare this for Subst drive *) DDU : byte; (* Device Driver Unit Number *) BPS : word; (* Bytes Per Sector *) SPC : byte; (* Sectors Per Cluster *) CSC : byte; (* Cluster Shift Count *) BS : word; (* Boot Sectors *) Fats : byte; (* Number of fats *) RDE : word; (* Max Root Dir entries *) FDS : word; (* First Data Sector *) HPC : word; (* Highest Possible Cluster # *) (* Case Variant *) Case byte of (* DOS < 4.0 OR OS2 *) 0 : (SpfOld : byte; (* Sectors per fat *) JunkOld : array[16..22] of byte; MdaOld : byte; (* Media Descriptor byte *) DummyOld : byte; NextOld : DpbPtr); (* Pointer to next record *) (* DOS >= 4.0 *) 1 :(SpfNew : word; JunkNew : array[17..23] of byte; MdaNew : byte; DummyNew : byte; NextNew : DpbPtr); end; Var dnum,i, num : byte; CurrDpB : DpbPtr; MDA : byte; SPF : word; params : array[0..31] of byte; UseNew : boolean; Begin DriveType := 0; (* Assume failure *) dnum := ord(drive)-64; (* 'A'=1, 'B'=2 etc. *) with regs do begin ah := $44; al := $08; bl := dnum; Intr($21, regs); if ax = $0f then exit; (* Invalid drive ! *) (* Here's where we try the undocumented return params ! *) num := (ax+(flags AND fCarry)+(flags AND fParity)); { if (ax = 0) then - Diversion for test purposes ! begin } (* OS2 will return > 10 *) UseNew := Lo(DosVersion) in [4..9]; (* Get Ptr to List of Lists *) ah := $52; es := 0; bx := 0; Intr($21,regs); if (es = 0) OR (bx = 0) then exit; (* Error ! *) (* Pointer to list - 0h is pointer to 1st DPB *) CurrDpb := PtrDpbPtr(Ptr(es,bx))^; (* Walk the chain of DPB's to our drive: 0='A' etc. *) (* Possible that drive is SUBSTed, so index from dnum instead of DN ! *) (* Don't index on 'A', cause it's already there ! *) for i := 2 to dnum do begin (* Offset set to $ffff on last in chain *) if (ofs(CurrDpb^) <> $ffff) then begin if UseNew then CurrDpb := CurrDpb^.NextNew else CurrDpb := CurrDpb^.NextOld; end (* Hit end of chain before got to our drive ! *) else exit; end; (* Of for *) Case UseNew of (* >= DOS 4.0 and NOT OS2 *) true : begin MDA := CurrDpb^.MdaNew; SPF := CurrDpb^.SpfNew; end; (* < DOS 4 or OS2 *) false : begin MDA := CurrDpb^.MdaOld; SPF := CurrDpb^.SpfOld; end; end; (* Of case *) (* Write out buncha stuff for analysis *) writeln(f,'DN is : ',CurrDpb^.DN); writeln(f,'DDU is : ',CurrDpb^.DDU); writeln(f,'BPS is : ',CurrDpb^.BPS); writeln(f,'SPC is : ',CurrDpb^.SPC); writeln(f,'CSC is : ',CurrDpb^.CSC); writeln(f,'BS is : ',CurrDpb^.BS); writeln(f,'FATS is : ',CurrDpb^.Fats); writeln(f,'RDE is : ',CurrDpb^.RDE); writeln(f,'FDS is : ',CurrDpb^.FDS); writeln(f,'HPC is : ',CurrDpb^.HPC); writeln(f,'SPF is : ',SPF); writeln(f,'MDA is : ',MDA); (* This work on last of multiple Benoulli drives ???? *) if (SPF > 2) AND (MDA >= $fc) then DriveType := Bernoulli else if num = 0 then begin (* Tell DOS to build new BPB for removable types *) fillchar(params,sizeof(params),0); params[0] := 4; (* Do NOT go to drive ! *) ax := $440d; cx := $0860; bl := dnum; dx := ofs(params); ds := seg(params); Intr($21, regs); Case params[1] of 0 : DriveType := Floppy360; 1 : DriveType := Floppy12; 2 : DriveType := Floppy720; 3,4 : DriveType := Floppy; 6 : DriveType := TapeDrive; 7 : DriveType := Floppy14; 8 : DriveType := Floptical; 9 : DriveType := Floppy28; end; begin writeln(f,'Params[1] is : ',byte(params[1])); writeln(f,'BPS is : ',word(params[7])); writeln(f,'SPC is : ',byte(params[9])); writeln(f,'Fats is : ',byte(params[12])); writeln(f,'RDE is : ',word(params[13])); writeln(f,'SPF is : ',word(params[18])); writeln(f,'MDA is : ',byte(params[17])); end; end (* Of Not Bernoulli *) { end} else (* ax > 0 ! *) begin Case num of 1 : DriveType := HardDrive; 5 : DriveType := BootHrdDrive; 6 : begin if IsCdRom(drive) then DriveType := CDRom else DriveType := RamDrive; end; else DriveType := 0; (* Error ! *) end; (* Of case *) end; (* Not a floppy or bernoulli *) end; (* With regs *) End; Begin (* TestDisk *) GetDate(y,m,d,dow); {$I-} assign(f,'TESTDISK.RPT'); rewrite(f); if IoResult <> 0 then begin write(^G); writeln('Can''t open report file: aborting !'); exit; end; SetTextBuf(f,buff); writeln(f); writeln(f,'DOS Drive Detection Survey Report'); writeln(f); writeln(f,'Please mail to: CDC Micro'); writeln(f,' PO Box 4457'); writeln(f,' Seattle WA 98104'); writeln(f,' (206) 435-1125'); writeln(f); writeln(f,'Thanks for taking the time to help with this survey !'); writeln(f); writeln(f,'Report dated : ',m:0,'/',d:0,'/',y:0); writeln(f); writeln(f,'Report submitted by : _________________________________________________________'); writeln(f,'My address & phone # is : _____________________________________________________'); writeln(f,'_______________________________________________________________________________'); writeln(f,'Test equipment is : ___________________________________________________________'); writeln(f,'_______________________________________________________________________________'); writeln(f,'For this test, my machine was booted from the: _______ drive.'); writeln(f,'For this test, I was running a RamDisk on Drive: ______,using _________________'); writeln(f,'For this test, I had a Bernoulli drive connected as Drive: ________ (Yes/No?)'); writeln(f,'For this test, I had a Tape/Optical drive connected as Drive: _______ (Yes/No?)'); writeln(f,'For this test, I was running Stacker/DoubleSpace/Other compressor. (Yes/No ?)'); writeln(f,'Test Conducted under : __________________________ operating/system/environment'); writeln(f,'Comments ? ____________________________________________________________________'); writeln(f); version := DosVersion; writeln(f,'DOS Version: ',version); if (version < 310) OR (NOT GetLastDrive(lastdrive)) then writeln(f,'Dos Version too low or lastdrive detection FAILED !!') else begin writeln(f,'LastDrive is: ',lastdrive:0); writeln(f); for i := 1 to lastdrive do with regs do begin drive := char(i+64); if DriveValid(drive) then begin IsHardDisk(drive); Dtype := ax+(flags AND fCarry)+(flags AND fParity); bits := BinStr(flags,16); writeln(f,'Drive '+Drive+': Value of AX is: ',ax); writeln('Drive '+Drive+': Value of AX is: ',ax); writeln(f,'Drive '+Drive+': Value of flags is: ',flags); writeln('Drive '+Drive+': Value of flags is: ',flags); writeln(f,'Drive '+Drive+': Flags bits are: '+bits); writeln('Drive '+Drive+': Flags bits are: '+bits); writeln(f,'Drive '+Drive+': AX+carry+parity is: ',ax+(flags AND fCarry)+(flags AND fParity)); writeln('Drive '+Drive+': AX+carry+parity is: ',Dtype); writeln(f,'Drive '+Drive+': flags AND fCarry is: ',flags AND fCarry,' ',flags AND fCarry = fCarry); writeln('Drive '+Drive+': flags AND fCarry is: ',flags AND fCarry,' ',flags AND fCarry = fCarry); writeln(f,'Drive '+Drive+': flags AND fParity is: ',flags AND fParity,' ',flags AND fParity = fParity); writeln('Drive '+Drive+': flags AND fParity is: ',flags AND fParity,' ',flags AND fParity = fParity); writeln(f,'Drive '+Drive+': flags AND fAuxiliary is: ',flags AND fAuxiliary,' ',flags AND fAuxiliary = fAuxiliary); writeln('Drive '+Drive+': flags AND fAuxiliary is: ',flags AND fAuxiliary,' ',flags AND fAuxiliary = fAuxiliary); writeln(f,'Drive '+Drive+': flags AND fZero is: ',flags AND fZero,' ',flags AND fZero = fZero); writeln('Drive '+Drive+': flags AND fZero is: ',flags AND fZero,' ',flags AND fZero = fZero); writeln(f,'Drive '+Drive+': flags AND fSign is: ',flags AND fSign,' ',flags AND fSign = fSign); writeln('Drive '+Drive+': flags AND fSign is: ',flags AND fSign,' ',flags AND fSign = fSign); writeln(f,'Drive '+Drive+': flags AND fOverFlow is: ',flags AND fOverflow,' ',flags AND fOverFlow = fOverFlow); writeln('Drive '+Drive+': flags AND fOverFlow is: ',flags AND fOverflow,' ',flags AND fOverFlow = fOverFlow); if (Dtype > 0) then if DriveIsRemote(Drive) then writeln(f,' ***** This drive is remote (network) or Substituted ? Yes/No/Which *****'); writeln(f,' ***** This is a '+DriveTypes[DriveType(f,Drive)]+' ? Yes/No *****'); writeln(f); writeln; end; (* Drive is valid *) end; (* For loop *) end; (* Lastdrive detection *) writeln(f,'End of Report... and Thanks for running this test !'); close(f); {$I+} if IoResult <> 0 then; writeln('Please print out and mail in the TESTDISK.RPT file.'); writeln('You''ll find it in this sub-directory.'); writeln('Thanks for running this test !'); End.