Pop Total pack: Suddenly the sound isn't midi but PC speaker

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NEO117
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Pop Total pack: Suddenly the sound isn't midi but PC speaker

Post by NEO117 » August 18th, 2010, 4:41 am

Yeah so I went ahead and tried to start a game when suddenly the music is "PC speaker" this has happened at least 3 times and I always gotta reinstall. Any solutions for this? I'm using Windows 7.

Jaffar
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PC Speaker sound only in POP-TP

Post by Jaffar » June 15th, 2013, 3:00 pm

Hi,
I am struggling with midi sound in POP-TP and have tried the program in both Windows 8 and XP with the same results. It does not seem to matter which variant of POP1 I try, sometimes I get full midi sound and the next time it is speaker sound only. The problem happens more often when using the cheats option. I have tried editing dosbox conf files without success. I have checked the Forum and only one other person seems to have posted the same fault, but without any solutions. Any ideas !

Regards

Jaffar

[Edit: I've moved your post under the other post about Total Pack's audio, to keep related posts together. --Norbert]

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Norbert
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Re: Pop Total pack: Suddenly the sound isn't midi but PC spe

Post by Norbert » June 15th, 2013, 3:35 pm

Hi Jaffar, if nobody here knows how to solve the problem you've ran into, you could try to private message (link) or e-mail (starwindz777TAhotmailTODcom) the Total Pack author.
The last time he visited this forum was about a year ago; not sure if he'll receive e-mails about private messages.

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Re: Pop Total pack: Suddenly the sound isn't midi but PC spe

Post by David » June 15th, 2013, 5:04 pm

I just tried it. The sound changed to pcspeaker when I enabled cheats.
The used config file is: C:\Program Files\PoP1-Total Pack\launcher\run_game.conf
This file is also present at: C:\Program Files\PoP1-Total Pack\launcher\p01_original.conf (or whatever mod you selected)
Oddly, in this file, sound blaster is enabled, *and* the game is started with "prince.exe sblast VGA".

The difference between conf file in the two cases:
MIDI:
core=normal
PCspeaker:
core=dynamic

What I don't know is:
- Why does cheat mode change the core to dynamic?
- Why does this change sound to PCspeaker?

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Re: Pop Total pack: Suddenly the sound isn't midi but PC spe

Post by David » July 3rd, 2013, 7:22 pm

David wrote:- Why does this change sound to PCspeaker?
It seems to depend on the cpu cycles (in DosBox) when the game starts.
I tried starting the game with fixed cycles, and anything above 16000 seems to cause the game to use the PCspeaker.
However it's not consistent: sometimes I get digital sounds with 20000, sometimes I get PCspeaker sounds with 15000.
(If you want to try it yourself without editing dosbox.conf, you can use the config cpu cycles=14000 statement with different numbers.)
So it's better to say that faster emulation increases the chances of switching to PCspeaker.
But why?
(Warning: everything below is technical!)

I've read that detecting certain types of sound cards works by starting a timer on a sound card, and waiting for the timer to expire.
Indeed, http://bochs.sourceforge.net/techspec/adlib_sb.txt (scroll to "Detecting a Sound Card") says just this.

Code: Select all

 |                          Detecting a Sound Card
 |
 |   According to the AdLib manual, the 'official' method of checking for a 
 |   sound card is as follows:
 |
 |      1)  Reset both timers by writing 60h to register 4.
 |      2)  Enable the interrupts by writing 80h to register 4.  NOTE: this
 |          must be a separate step from number 1.
 |      3)  Read the status register (port 388h).  Store the result.
 |      4)  Write FFh to register 2 (Timer 1).
 |      5)  Start timer 1 by writing 21h to register 4.
 |      6)  Delay for at least 80 microseconds.
 |      7)  Read the status register (port 388h).  Store the result.
 |      8)  Reset both timers and interrupts (see steps 1 and 2).
 |      9)  Test the stored results of steps 3 and 7 by ANDing them
 |          with E0h.  The result of step 3 should be 00h, and the 
 |          result of step 7 should be C0h.  If both are correct, an
 |          AdLib-compatible board is installed in the computer.
Perhaps PoP uses an empty loop for waiting?
Faster emulation would cause it to end too early.
I'll check this in the disassembly.

I think I found it:

Code: Select all

seg009:6F39		    mov	    dx,	388h
seg009:6F3C		    mov	    ax,	1
seg009:6F3F		    call    out_word
seg009:6F42		    mov	    ax,	6004h
seg009:6F45		    call    out_word
seg009:6F48		    mov	    ax,	8004h
seg009:6F4B		    call    out_word
seg009:6F4E		    in	    al,	dx
seg009:6F4F		    mov	    bh,	al
seg009:6F51		    call    wait100
seg009:6F54		    mov	    ax,	0FF02h
seg009:6F57		    call    out_word
seg009:6F5A		    mov	    ax,	2104h
seg009:6F5D		    call    out_word
seg009:6F60		    call    wait100
seg009:6F63		    call    wait100
seg009:6F66		    in	    al,	dx
seg009:6F67		    mov	    bl,	al
seg009:6F69		    call    wait100
seg009:6F6C		    mov	    ax,	6004h
seg009:6F6F		    call    out_word
seg009:6F72		    mov	    ax,	8004h
seg009:6F75		    call    out_word
seg009:6F78		    and	    bx,	0E0E0h
seg009:6F7C		    cmp	    bx,	0C0h ; 'À'

seg009:6F86 out_word	    proc near		    ; CODE XREF: sub_1360E+C1p
seg009:6F86					    ; sub_1360E+C7p ...
seg009:6F86		    call    out_byte
seg009:6F89		    xchg    al,	ah
seg009:6F8B		    inc	    dx
seg009:6F8C		    call    out_byte
seg009:6F8F		    dec	    dx
seg009:6F90		    xchg    al,	ah
seg009:6F92		    retn
seg009:6F92 out_word	    endp

seg009:6F93 out_byte	    proc near		    ; CODE XREF: out_wordp
seg009:6F93					    ; out_word+6p
seg009:6F93		    out	    dx,	al
seg009:6F93 out_byte	    endp
and wait100 is:

Code: Select all

seg009:6F94 wait100	    proc near		    ; CODE XREF: sub_1360E+D3p
seg009:6F94					    ; sub_1360E+E2p ...
seg009:6F94		    mov	    cx,	100h
seg009:6F97 
seg009:6F97 loc_13727:				    ; CODE XREF: wait100+3j
seg009:6F97		    loop    loc_13727
seg009:6F99		    retn
seg009:6F99 wait100	    endp
Here is the empty loop!

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Re: Pop Total pack: Suddenly the sound isn't midi but PC spe

Post by David » July 9th, 2013, 9:07 am

The solution: In Total Pack you can set the CPU cycles. Set it to 3000.

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