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  2. Macintosh startup - Wikipedia

    en.wikipedia.org/wiki/Macintosh_startup

    A Happy Mac is the normal bootup (startup) icon of an Apple Macintosh computer running older versions of the Mac operating system. It was designed by Susan Kare in the 1980s, drawing inspiration from the design of the Compact Macintosh series and from the Batman character Two-Face. [10]

  3. Power-on self-test - Wikipedia

    en.wikipedia.org/wiki/Power-on_self-test

    Macs made after 1987 but prior to 1998, upon failing the POST, will immediately halt with a "death chime", which is a sound that varies by model; it can be a simple beep, a car crash sound, the sound of shattering glass, a short musical tone, or more. On the screen, if working, will be the Sad Mac icon, along with two hexadecimal strings, which ...

  4. Settings A-Z - AOL Help

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    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  5. PC speaker - Wikipedia

    en.wikipedia.org/wiki/PC_speaker

    Smacky Open-source C++ software for playing (monophonic) music on the PC speaker. Site for old PC without sound cards. Programming the PC Speaker, by Mark Feldman for PC-GPE. Programming the PC Speaker, by Phil Inch: part 1, part 2 (includes a very detailed explanation of how to play back PCM audio on the PC speaker, and why it works)

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  9. Macintosh 128K/512K technical details - Wikipedia

    en.wikipedia.org/wiki/Macintosh_128K/512K...

    The sampled sound engine piggybacked on the video circuit. As the raster scan returned from the right side of the screen to the left, one byte of data was placed into a PWM generator instead of the screen. This provided 8-bit sampled monaural sound sampled at the 22.25 kHz horizontal blanking rate. General purpose 6522 outputs could mute the ...