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Corrected headings for Markdown syntax

Thomas Harte 2018-06-15 15:46:58 -04:00
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The-Mockingboard.md

@ -1,6 +1,7 @@
The Mockingboards are a series of audio expansions for the Apple II, the most common of which provides stereo sound from a combination of two 6522s, connected to two AY-3-8910s. The Mockingboards are a series of audio expansions for the Apple II, the most common of which provides stereo sound from a combination of two 6522s, connected to two AY-3-8910s.
== AY-3-8910s == ## AY-3-8910s
Each AY is connected to its 6522: Each AY is connected to its 6522:
* the 6522 port A connected to the AY's data pins; * the 6522 port A connected to the AY's data pins;
* bit 0 of the 6522's port B connected to the AY's BC1; * bit 0 of the 6522's port B connected to the AY's BC1;
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The three channels from each AY are mixed together with equal volume. The three channels from each AY are mixed together with equal volume.
== 6522s == ## 6522s
The 6522s are exposed to the processor's bus: The 6522s are exposed to the processor's bus:
* the four register select lines are connected to address lines 0 to 3; and * the four register select lines are connected to address lines 0 to 3; and
* the reset and data lines connected as expected. * the reset and data lines connected as expected.
@ -25,5 +27,6 @@ The 6522 for the right channel:
Both also require the board's IOSEL to be active — they appear only in the ordinary IO area for their board. Both also require the board's IOSEL to be active — they appear only in the ordinary IO area for their board.
== Clock Rate == ## Clock Rate
Both the 6522s and the AYs are clocked according to the Apple card's phase 1 clock input. So they are clocked at the same rate as the CPU. Both the 6522s and the AYs are clocked according to the Apple card's phase 1 clock input. So they are clocked at the same rate as the CPU.