Horrendous noise when tracing

[colinleroy]

MAME version

0.263 (unknown) (0.263+dfsg.1-0ubuntu1ppa1mantic1)

System information

Linux Ubuntu 23.04, x86_64, en_US.UTF-8 locale.

INI configuration details

#
# CORE CONFIGURATION OPTIONS
#
readconfig                1
writeconfig               1

#
# CORE SEARCH PATH OPTIONS
#
homepath                  .
rompath                   $HOME/mame/roms;/usr/local/share/games/mame/roms;/usr/share/games/mame/roms
hashpath                  files
samplepath                $HOME/mame/samples;/usr/local/share/games/mame/samples;/usr/share/games/mame/samples
artpath                   $HOME/mame/artwork;/usr/local/share/games/mame/artwork;/usr/share/games/mame/artwork
ctrlrpath                 /usr/share/games/mame/ctrlr
inipath                   $HOME/.mame;/etc/mame
fontpath                  /usr/share/games/mame/fonts
cheatpath                 $HOME/mame/cheat;/usr/local/share/games/mame/cheat;/usr/share/games/mame/cheat
crosshairpath             $HOME/mame/crosshair;/usr/local/share/games/mame/crosshair;/usr/share/games/mame/crosshair
pluginspath               /usr/share/games/mame/plugins
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swpath                    software

#
# CORE OUTPUT DIRECTORY OPTIONS
#
cfg_directory             $HOME/.mame/cfg
nvram_directory           $HOME/.mame/nvram
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diff_directory            $HOME/.mame/diff
comment_directory         $HOME/.mame/comments
share_directory           share

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#
# CORE MISC OPTIONS
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# BGFX POST-PROCESSING OPTIONS
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# SDL LOW-LEVEL DRIVER OPTIONS
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videodriver               auto
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gl_lib                    auto

#
# FRONTEND COMMAND OPTIONS
#
dtd                       1

#
# SLOT DEVICES
#
printer                   null_modem
modem                     null_modem

#
# IMAGE DEVICES
#
floppydisk1               /home/colin/Documents/git-oss/a2tools/wozamp-65c02.po
floppydisk2               /home/colin/Documents/git-oss/a2tools/disks/qt100.dsk
bitbanger                 /home/colin/Documents/git-oss/a2tools/socket.localhost:2001
bitbanger2                /home/colin/Documents/git-oss/a2tools/socket.localhost:2000

Emulated system/software

apple2c0

Incorrect behaviour

Hello,

Here is a little problem I face when cross-developing using MAME: activating the CPU trace triggers horrendous noise, as heard in https://www.youtube.com/watch?v=BSJyvu5AT78

These clicks also happen when tracing while the emulated machine does not access the speaker at all: https://www.youtube.com/watch?v=XFSnVqK_GcI

Sorry about the video quality, I hadn't noticed how out of focus this was. I'm using the following trace command:

trace test.tr,maincpu,noloop,{tracelog "A=%02X,X=%02X,Y=%02X,P=%02X ",a,x,y,p}

It may be due to the fact my computer can't run emulation at 100% speed when tracing. Still, it would be nice to be able to keep sound on when tracing :)

Expected behaviour

The sound would be clear

Steps to reproduce

mame apple2c0 -debug

In the debug window:

• F5 to start machine
• trace test.tr,maincpu,noloop,{tracelog "A=%02X,X=%02X,Y=%02X,P=%02X ",a,x,y,p}

Additional details

No response

[happppp]

apple2 driver sound output has a DC offset. Another way to hear it is by pausing/unpausing (F5 key), or (at least on Windows) by resizing or dragging the window. This will happen on any MAME driver with sound DC offset.

Hiccups with emulation speed when doing something taxing like tracing the CPU can't be helped.
The audio pops: perhaps it's possible to resolve by writing the last known value to the sound output instead of 0. IIRC holub opened a PR or issue for this problem? I can't find it, so maybe he wrote about that on the chat and not here on github.

[rb6502]

Audio problems are unavoidable when MAME can't run 100% speed. The specific DC offset cited is due to the AY-3-891x on the Mockingboard. On a slotted II you can remove it and things are much better, but there's not a great way to do that on the IIc, in part due to MAME architectural limitations (you can't read machine config switches at machine configuration time, which is problematic when emulating hard-wired peripherals like the Mockingboard 4C). You can always run -sound none when debugging.