; DETECTSB is Sound Blaster or compatible sound card detection routine for DOS
; Version: 1.00
; Author: Ben Lunt (Forever Young Software(R))
; Refernce: "Programming the SoundBlaster 16 DSP" by Ethan Brodsky
; Date: 18 Nov 2000
; Assembler: NBASM 00.24.xx
.model tiny
.code
org 100h ; we need to make a .COM file
start: mov dx,offset DSound ; text output
mov ah,09h
int 21h
call Reset_DSP ; reset it
jc short RstError ; if carry then error
mov dx,offset SoundBD ; text output
mov ah,09h
int 21h
xor al,al ; no error ERRORLEVEL = 0
jmp short Done
RstError: mov dx,offset Sberror ; display information if Soundblaster
mov ah,09h ; is not on this baseaddress
int 21h ; text output
xor al,al ; there was an error
dec al ; ERRORLEVEL = 0FFh
Done: .exit
Reset_DSP proc near
; Write a 1 to the reset port
mov dx,226h
mov al,1 ; al = 1
out dx,al ; start DSP reset
; Wait
in al,dx ; wait for slow ports
in al,dx ; .
in al,dx ; .
in al,dx ; .
; Write a 0 to the reset port
xor al,al
out dx,al ; end DSP Reset
; Poll the read-buffer status port until bit 7 is set
mov dx,22Eh ; dx = DSP data available
call WaitRead
; Poll the read data port until you receive an AA
mov dx,22Ah ; dx = DSP Read Data
in al,dx
cmp al,0AAh ; if there is a SB then it returns 0AAh
je short SBthere
stc
ret
SBthere: clc
ret
; The DSP usually takes about 100 microseconds to initialized itself. After
; this period of time, if the return value is not AA or there is no data at
; all, then the SB card may not be installed or an incorrect I/O address is
; being used.
Reset_DSP ENDP
WaitRead proc near
push cx
xor cx,cx ; need that for slow SBs !
loopWaitR: dec cx
jz short endloopR
in al,dx ; al = data available status
or al,al
jns short loopWaitR ; jump if bit7=0 - no data available
endloopR: pop cx
ret
WaitRead endp
WaitWrite proc near
push cx
xor cx,cx ; need that for slow SBs !
loopWaitW: dec cx
jz short endloopW
in al,dx ; al = write command status
or al,al
js short loopWaitW ; jump if bit7=1 - writing not allowed
endloopW: pop cx
ret
WaitWrite endp
DSound db 13,10,'Trying to detect a Sound Blaster by initalizing it...$'
Sberror db 13,10,'A SoundBlaster is not detected on this system.$'
SoundBD db 13,10,'SoundBlaster Detected.',13,10,'$'
end start
运行结果:
E:\>detectsb
Trying to detect a Sound Blaster by initalizing it...
SoundBlaster Detected.
E:\>
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