Okay you would have to be specific (article, forum post, something) to get more of a solid answer. Now let me point out a few things, no one does "8-bit" that is what was done more then 20 years ago, coding in 8-Bits (1Byte), as compared to our GigaByte working in 64-Bit (8Byte) code world.
Now back when, say 1980s (ancient for you kids) we didn't have Internet, cellphone, youtube, not even webpages. But when the first games ever released (Pong, Breakout, Asteroids, etc.) they were 8-bit coded games. In the coding was a mechinism or series of waves, sent from the coding to the Audio Device (think of the tinny speaker in your deaktop that BEEPS). That was simple positive and minus lines to the speaker, and could 'modulate' the frequency high, low, repeatedly, or just on and off. Based on this the Data coding would tell the hardware device High, low, repeat or on / off the soundwave coming out of it. Based upon the conversion of the electrical signal in the speaker to that pattern our ears picked it up like Doop Doop Doop.. Dip.. Ding.. Buzz.. and so on.
The Data wasn't actually converted to analog, but was instead sent in the 8-bits of data a particular pattern (say 10001111) would give High tone, sending another data pattern (11001110) would make it almost sound like wobbly signal, and so on. Remember speakers take the pulse of the electrical signal and 'vibrate' against the air that pattern which causes the audio we hear (sound is vibration in modulated tones and frequencies of air molecules moving).
Does that help?