Get ready for Mach 3!

https://www.youtube.com/watch?v=9yL-u7lsMxk

The intro music, sound effects and voices in the game were all digitized 
audio played through the PC speaker, without interrupting anything else. 
To bad the game's authors didn't put as much effort into the effects as 
they did the intro.

The 'regular' method of using the PC speaker caused an interrupt which 
halted everything else in the system, which is why it was normally used 
only for a simple, short beep.

Microsoft made a PC speaker audio driver for Windows 3.x but it followed 
the rules, everything halted while audio was being played. It wasn't 
until Windows 95 that Microsoft figured out how to do what DOS games had 
been doing for years with the PC speaker. The driver for Win 9x does not 
bring the system to a halt while digitized audio plays through the PC 
speaker.

'Course not many people ever experienced that since by 1995 a sound card 
or audio device built into the motherboard was pretty much standard 
equipment. (Yup, I had one Win 95a box without a sound card so I used 
the PC speaker driver.)

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