; Drive detection by: Lee Hamel (hamell@cs.pdx.edu) - July 6th, 1994
; Partial credit to: Paul Schlyter
;
; Goes thru drives A-Z and determines if they:
; 1) Exist
; 2) Are removable or fixed
; 3) Are local, remote, or shared
; 4) Are a floppy, hard, RAM, subst, or CD-ROM drive
. Model tiny
.286
DRIVEXISTS EQU 1
REMOVEDRV EQU 0
FIXEDDRV EQU 1
LOCALDRV EQU 0
REMOTEDRV EQU 1
SHAREDRV EQU 2
FLOPPY EQU 0
HARD EQU 1
RAM EQU 2
SUBST EQU 3
CDROM EQU 4
. Code
org 100h
start: mov ah, 19h
int 21h; get start drive
mov [curdrive], al
mov ax, 40h
mov es, ax
mov bh, es: [10h]; 40:10 h is # of floppies-1
shr bh, 6
inc bh; # of actual floppy drives
mov bl, 1
mov di, offset drives
nextchkfloppy: mov ax, 4409h; check if drive exists
int 21h
jc nextsetfloppy
test dh, 10000000b; check if SUBST drive
jz chkfloppy
dec bh; dec actual drive count
mov byte ptr [di +3], SUBST
setfloppyexist: mov byte ptr [di], DRIVEXISTS
jmp nextsetfloppy
chkfloppy: dec bh; dec actual drive count
js nextsetfloppy
mov byte ptr [di +1], REMOVEDRV
mov byte ptr [di +3], FLOPPY
jmp setfloppyexist
nextsetfloppy: add di, 4
inc bl
cmp bl, 2; if B then jump back
je nextchkfloppy
mov ch, 24; loop 24 times (drives C - Z)
mov cl, 3; start at C:
drivechkloop: mov ax, 4409h; check if drive exists
mov bl, cl; set drive letter
int 21h; 0 = default, 1 = A:, etc.
jc nextsetdrv
mov byte ptr [di], DRIVEXISTS
mov ax, 4408h; check if removable
int 21h
mov byte ptr [di +1], al; set REMOVABLE or FIXED
mov bx, dx
mov dl, dh
shr dl, 7
and dh, 00010000b
shr dh, 4
mov byte ptr [di +2], dh; set REMOTE or LOCAL
or dl, dl; if not SUBST, then jump
jz chkremote
mov byte ptr [di +3], SUBST
jmp nextsetdrv
chkremote: cmp dh, REMOTEDRV; if REMOTE, then check for CD ROM
je chkcdrom
test bh, 00000010b; sharable?
jz drivenoshare
mov byte ptr [di +2], SHAREDRV
drivenoshare: test bl, 00000010b; RAM drive?
jnz nextsetdrv
mov byte ptr [di +3], RAM
jmp nextsetdrv
chkcdrom: push cx
mov ax, 1500h
xor bx, bx
int 2fh
pop cx
or bx, bx; MSCDEX driver found?
jz nextsetdrv; if not, jump to next drive setup
mov ax, 150bh
dec cl; 0 = A:, etc.
int 2fh
inc cl
or ax, ax
jz nextsetdrv; drive supported by MSCDEX?
mov byte ptr [di +3], CDROM
nextsetdrv: add di, 4
inc cl
dec ch
jnz drivechkloop
mov ah, 0eh
mov dl, [curdrive]
int 21h; reset start drive
mov cl,''A''; output all existing drives
mov di, offset drives
mov ah, 9
drvdumploop: cmp byte ptr [di], DRIVEXISTS
jne nextdrvdump
mov al, cl
int 29h
xor dh, dh
mov dl, byte ptr [di +1]
shl dx, 4
add dx, offset removablemsg
int 21h
xor dh, dh
mov dl, byte ptr [di +2]
shl dx, 3
add dx, offset localmsg
int 21h
xor dh, dh
mov dl, byte ptr [di +3]
shl dx, 3
add dx, offset typemsg
int 21h
mov dx, offset crlf
int 21h
nextdrvdump: add di, 4
inc cl
cmp cl,''Z''
jbe drvdumploop
ret
curdrive db 0
drives db 26 dup (0,1,0,1)
; Default to not exist, fixed, local, hard drive
crlf db 10,13 ,''$''
removablemsg db'': Removable $''
db'': Fixed $''
localmsg db''Local $''
db''Remote $''
db''Shared $''
typemsg db''Floppy $''
db''Hard $''
db''RAM $''
db''Subst $''
db''CD-ROM $''
end start
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